CN106761852B - The underwater coal petrography deep hole pressure-bearing microexplosion grouting water blocking method of wide area - Google Patents

Abstract

The invention discloses a method for grouting and plugging water with deep-hole pressure-bearing micro-bursts in a wide-area underwater coal rock. By drilling multiple sets of drilling holes in the coal and rock, and using the deep-hole pressure-bearing micro-burst technology, on the one hand, the coal and rock are effectively increased. The pressure relief and fracturing space in the body, on the other hand, give full play to the high-efficiency and uniform load transfer characteristics of the solid-liquid coupling explosion-promoting medium around the charge in the hole, reduce the violent overload effect of the explosive explosion, and expand the pressure relief and fracturing range of the coal and rock mass. Fully realize the large space and all-round penetration of the primary and secondary water-conducting fissures in the coal body, and form a large-scale fissure pore network structure. The subsequent high-pressure grouting plugging operation will be conducive to the comprehensive sealing of the primary and secondary water-conducting fissures in the coal and rock body. Blocking, forming a wide-area grouting curtain, blocking a large area of water-conducting fracture channels in the surrounding rock, and the water-blocking effect is remarkable, realizing static rock-breaking and cracking and wide-area water-conducting in the surrounding rock under the action of excessive dynamic load of explosive explosion in the hole. Complete sealing of fissures.

Description

The underwater coal petrography deep hole pressure-bearing microexplosion grouting water blocking method of wide area

Technical field

The present invention relates to a kind of underwater coal petrography deep hole pressure-bearing microexplosion grouting and sealing technique of wide area, can be used for wide area surface water, The fields such as coal petrography anti-reflection, increasing is split, grouting for water blocking, release, erosion control under the influence of artesian water, underground underground river and crevice water, ensure The efficient production and safety of rich water mining area coal mine and Tunnel Engineering are excavated.

Background technique

China's water resource preservation is abundant, and surface water, underground latent water, underground underground river and artesian water are widely distributed.In coal mine and Tunnel Engineering is normally exploited in digging process, is often invaded and harassed problem by different degrees of water damage.For example, in shallow buried coal seam In the exploitation and digging process in tunnel, extensive development is penetrated through by exploitation disturbance and overlying strata braking effect, roof fracture, is involved Earth's surface wide area water source induces large-scale engineering infiltration or water bursting disaster；Exploitation for medium and deep coal seam, also due to coal seam Exploitation disturbance and top plate, which collapse to break on a large scale, to be influenced, and after rich water rock stratum, underground underground river or artesian aquifer is connected in overlying strata crack, will be given Coal mine and Tunnel Engineering normally produce and excavation brings serious gushing water hidden danger, threaten worker's life security, tremendous economic is caused to damage It loses；The trend of deep mining is turned to coal resources, frequent preservation has coal seam goaf product above Deep Thick and super high seam The wide areas rich water water source such as water, water table aquifer, artesian aquifer, underground underground river, in addition the large space top after high and extra-high seam mining The hardened a wide range of unstability of structure collapses the disconnected heavily stressed comprehensive function in joint deep, and overlying strata water producing fractures, which easily penetrate through, covers wide area rich water Area is unfavorable for safety in production and the excavation of mine and Tunnel Engineering, to social economy to bury different degrees of gushing water hidden danger It makes a very bad impression with benefit.

Reinforce the advanced physical prospecting in water source in consideration of it, often taking during colliery scene and constructing tunnel, adhere to visiting water and puts The technical measures that water combines prevent and treat the gushing water hidden danger of hydrous fluids in production and construction operation process.However, being assigned for wide area water source Under the conditions of depositing, take conventional extraction water measure both unrealistic or uneconomical, and limited by water source exploration technology acuracy, On the basis of reinforcing water source aided detection technology, water hole is largely visited by complement again toward contact and reinforce prevention, dramatically increased Drill project amount and the cost of drilling visit water in addition and dewatering orifice set the determination of the parameters such as position, direction and depth still There are certain blindness, will often visit water and dewatering orifice is set in anhydrous or poor-water area, can not link up country rock in time and dominate water crack Gap be easy to cause huge engineering and economic loss.At the same time, release influence is adopted based on coal petrography, in view of stope and lane Road near region country rock water producing fractures are developed, and by taking the measure that slip casting blocks in hole in engineering practice, attempt to block country rock completely Water producing fractures prevent and treat the generation of rich water coal petrography gushing water hidden danger, but setting there are blindness due to water blockoff drilling, often result in and enclose Rock drilling, which is set, cannot accurately link up main conduit pipe.When drilling set anhydrous, poor-water or closing Fractured zone when, will lead to Bored grouting water blockoff loses meaning, or even if setting drilling in country rock time water producing fractures, and has effectively blocked part time Water producing fractures channel, but since country rock primary and secondary water producing fractures perforation degree is little, the slip casting in drilling local secondary crack blocks not It is able to achieve effective closure that aquaporin is dominated to country rock, in leading aquaporin under the continuous action of artesian water, main water producing fractures Will again link up injected hole block range other than other secondary water producing fractures, and then realize country rock water producing fractures channel reconstruct with Change its course, also results in wall rock drill-hole grouting for water blocking less effective.

It to sum up analyzes, the extraction sluicing measure under wide area water source occurrence condition was both unrealistic or uneconomical, therefore accurately looked for To or link up country rock and dominate and aquaporin and carry out timely slip casting closure, be to solve under wide area water condition in coal mine and Tunnel Engineering The key of gushing water hidden danger, the underwater coal petrography deep hole pressure-bearing microexplosion grouting and sealing technique of wide area provided by the invention, by coal petrography Multiple groups drilling is set, using pressure-bearing microexplosion technology in hole, the intracorporal release increasing of coal petrography had not only been effectively increased and has split space, but also sufficiently hair The efficient uniform posting characteristic for having waved solid-liquid coupling propagation of explosion medium in powder charge periphery in hole, realizes primary and secondary water producing fractures in country rock Abundant perforation, compensate for the leting speeper blindness that sets of drilling initial stage, subsequent high-pressure slip-casting blocks operation and will more have in addition Conducive to comprehensive closure of water producing fractures in coal and rock.The perforation extensively of coal and rock blasting crack hole pattern and primary and secondary water producing fractures is auxiliary It is blocked with high-pressure slip-casting, conducive to the grouting for water blocking curtain for forming wide area, water plugging effect is significant, and it is super dynamic to realize explosive charge in hole Static broken rock under load effect increases the comprehensive closure split with country rock wide area crack, has extensive Technique Popularizing and application value.

Summary of the invention

Coal mine and the tunnel exploitation that the present invention is directed under wide area water source occurrence condition are asked with the water-inrush prevention in excavation project Topic, provide the underwater coal petrography deep hole pressure-bearing microexplosion grouting water blocking method of wide area, based in hole solid-liquid coupling propagation of explosion medium it is efficient Uniform posting characteristic, realizes the extensive perforation of primary and secondary water producing fractures in country rock, makes up leting speeper drilling and sets when position is chosen Blindness, subsequent high-pressure slip-casting blocks the comprehensive closure for being more advantageous to water producing fractures in coal and rock in addition, can be preferably real Static broken rock increasing in existing hole under the super Under Dynamic Load of explosive charge is split and the comprehensive plugging effect in country rock wide area crack.

The technical solution adopted by the present invention are as follows: a kind of underwater coal petrography deep hole pressure-bearing microexplosion grouting water blocking method of wide area, including Drilling lays, quickly process is ignited in fluid injection, exhaust and powder charge in injection hole sealing and hole in powder charge and pipeline arrangement, hole in hole, Specifically includes the following steps:

1) it is directed to specific rich water mining area and constructing tunnel condition, specifies grouting for water blocking spatial dimension, designs drilling parameter, Determine reasonable hole depth, pitch of holes, layer the position ,/parameters such as elevation angle degree and aperture of inclining；Made using high-power drilling machine progress sequence punching Industry, strict control drilling machine are drilled precision.

2) before borehole charge, blast hole is cleaned in advance, remaining coal petrography powder, sequence are packed into quantitative solid explosive in cleaning hole (under the conditions of liquid explosive wouldn't powder charge), synchronous installation liquid injection pipe and exhaust pipe, and by primacord in conjunction with liquid injection pipe and exhaust pipe Outside hole wall arrangement fairlead.

3) the quick injection hole sealing device of soft plasticity is used, porous synchronous carries out quick injection hole sealing work to coal petrography sealing section Industry, sealing of hole segment length are consistent.

4) after coal petrography sealing section grout cures, porous synchronous fluid injection, exhaust operation.When there is liquid stream persistently to flow in exhaust pipe When out, exhaust pipe shut-off valve is closed, liquid injection pipe continues fluid injection pressurization, while binding primacord and detonator, carrying out big gun line line work Industry, after personnel remove safety place, explosive in detonating primer and hole.

5) it in hole after explosive initiation, checks that drilling in coal and rock blocks situation, secondary envelope is taken in time for microexplosion punching drilling It is stifled, after the secondary solidification of sealing section slurries, water blockoff Grouting Pipe is connected to high-pressure injection pump, explosion coal and rock is carried out big empty Between, comprehensive high-pressure slip-casting block operation.

Preferably, drilling parameter is arranged in the step 1): selected drilling should be advisable with large aperture, generally 60 On the one hand~100mm or so provides sufficient release increasing for coal and rock and splits space, be on the other hand then conducive to the later period powder charge, Sealing of hole and high-pressure slip-casting operation；Based on the efficient posting characteristic of powder charge periphery solid-liquid coupling propagation of explosion medium, to meet country rock near region The stabilization of Coal-body Structure, what injection hole sealing length was generally drillable length 40%~60% is advisable；For the spacing of wells and hole Depth is main depending on coal petrography intensity and stress of primary rock condition, should follow short-bore depth, small spacing principle as far as possible for hard coal petrography, protect It demonstrate,proves hard coal petrography crack sufficiently to extend and penetrate through, should suitably increase hole depth and pitch of holes vice versa for soft coal petrography.

Preferably, borehole charge and pipeline arrange process in the step 2): for general drilling in coal and rock, setting The drilling for tendency of facing upward is beneficial to the borehole cleaning operation of the row fortune and later period of coal petrography powder during drilling, at this time the note in blast hole Liquid pipe installing depth only requires more than 0.1~0.3m of sealing section, and exhaust pipe then needs to be installed up to bottom hole position；For nutation tendency Drilling then need to clear coal petrography powder remaining in hole, need liquid injection pipe being installed up to hole at this time by corresponding auxiliary borehole cleaning facility Bottom, and be more than 0.1~0.3m of drilling and sealing section by exhaust pipe.Meanwhile it need to be by primacord in conjunction with liquid injection pipe and exhaust pipe edge respectively Hole wall arranges outside fairlead.

Preferably, explosive payload is generally less than the 1/3 of drilling overall length conventional charge blasting condition in the step 2) mesoporous, When selecting liquid explosive, the liquid explosives of low energy, low sensitivity can only be generally selected, such as nitroglycerine base liquid explosives EL-389- B, water base thickening liquid explosives NO.1286646, nitroparaffin hydrocarbon based liquids explosive, passivation TAL-1005-C etc., explosive blasting energy Equivalent is lower than the 1/3 of rock explosive blasting energy.

Preferably, the soft quick injection hole sealing device of plasticity described in the step 3), is a kind of with water blockoff slip casting The rapid hole sealing device of pipe；

The rapid hole sealing device end with water blockoff Grouting Pipe opens up the matched side of size depending on water blockoff Grouting Pipe bore To inclined hole, water blockoff Grouting Pipe is drawn by lateral inclined hole, and is realized to block by the biconial pipe fitting of two-tube end and be imitated with slip casting Fruit；

The water blockoff Grouting Pipe and the quick injection hole sealing device of soft plasticity are the soft plastic tube that cracks, wherein for sealing of hole Grouting Pipe position of cracking is located in coal petrography sealing section, and water blockoff Grouting Pipe is cracked, position is located at other than drilling and sealing section.

The rapid hole sealing device with water blockoff Grouting Pipe is installed, first by annular smooth umbrella buckle by device end cover to It is more than the lateral inclined hole position in end；Then by water blockoff Grouting Pipe by the front end insertion of the quick injection hole sealing device of soft plasticity and by filling The lateral inclined hole of set terminal draws 0.5~1.0m；Annular salient angle umbrella is buckled again and is inserted in by the front end of water blockoff Grouting Pipe, soft modeling is filled in Front end in the quick injection hole sealing device pipe of property；Finally the intact device that combination finishes is filled in injected hole, and device is last The smooth umbrella of the annular at end, which is buckled, is pushed into the position away from 0.2~0.5m of aperture along tube wall.

Preferably, process is ignited in fluid injection, exhaust and powder charge in the step 4) mesoporous: being directed to coal and rock unit section hole Reticular density is larger or the higher condition of damaged degree, and water body filter loss is relatively large in coal petrography hole, should select larger aperture as far as possible Liquid injection pipe carry out porous synchronous fluid injection operation；Conversely, should suitably reduce aperture and the liquid injection pipe item number of fluid injection pipeline.Coal petrography bores In the injection process of hole, when exhaust pipe continues flow liquid, exhaust pipe shut-off valve is closed, liquid injection pipe continues fluid injection pressurization, and in hole Before explosive initiation, pressure-bearing medium is always maintained at band pressure condition in hole.

Preferably, institute's fluid injection body is broadly divided into two major classes in the step 4) mesoporous, when explosive is solid-state or coagulates in hole When poly- state, institute's fluid injection body is the mixed liquor of water, salt water or doped portion hardening agent such as fine sand, iron powder etc.；When using liquid explosive When carrying out explosion, directly selection liquid explosives should have low sensitivity and enough stability as propagation of explosion medium.

Preferably, the subsequent high pressure slip-casting water-blocking operation in the step 5), will select according to the filter loss of coal and rock The matched grouting for water blocking material of property.For the larger condition of filter loss, choose as far as possible have both setting time is short, early strength is high, Steadily in the long term, the water shutoff material of the characteristics such as excellent, indissoluble water of expansion character, such as polyurethane, rapid expanding cement etc.；Conversely, right In the little condition of filter loss, material selection standard can suitably relax, such as ordinary cement, mud etc..

Passed through using pressure-bearing microexplosion technology in hole based on the efficient uniform posting characteristic of solid-liquid coupling propagation of explosion medium in hole Multiple groups drilling is set in coal petrography, is expanded coal and rock internal drilling release increasing and is split range, primary and secondary water producing fractures is big in realization coal body Space, comprehensive perforation, subsequent high-pressure slip-casting blocks the comprehensive closure for being more advantageous to primary and secondary water producing fractures in coal and rock in addition, It can preferably realize that the static broken rock increasing in hole under the super moving load condition of explosive charge is split to block comprehensively with country rock wide area crack.

Beneficial effects of the present invention:

It is in coal and rock 1. the porous arrangement of coal and rock internal drilling, effectively increases the discharge space in coal petrography unit volume The abundant extension and perforation of primary and secondary water producing fractures provide steric requirements.

2. splitting technology using pressure-bearing microexplosion increasing in hole, the efficient uniform posting of solid-liquid coupling propagation of explosion medium is made full use of Can, blasting energy sphere of action is improved, the country rock extensive disruption purpose under a small amount of charging condition, powder charge energy in hole are realized Amount utilization rate significantly improves.

3. coal petrography deep hole pressure-bearing microexplosion powder charge is few, intensity is low, reduces explosive charge high-energy and the concentration of single hole is acted on Intensity effectively reduces the punching possibility of sealing material, is conducive to the stabilization of country rock near region coal and rock.

4. being effectively reduced using deep hole pressure-bearing microexplosion technology based on the posting characteristic of solid-liquid coupling propagation of explosion medium in hole The super dynamic load effect of explosive charge expands coal and rock release increasing and splits range, adequately achieves the big of primary and secondary water producing fractures in coal body Space, comprehensive perforation effectively compensate for the blindness visited and put drilling initial stage when setting.

Detailed description of the invention

Fig. 1 is coal petrography deep hole pressure-bearing microexplosion grouting for water blocking sectional structure chart.

Fig. 2 is the soft plasticity rapid hole sealing device with water blockoff Grouting Pipe.

In figure: 1- rich water tunnel, 2- overlying strata water-bearing layer, 3- drilling, the main water producing fractures of 4-, 5- water producing fractures, 6- drilling Injection hole sealing section, 7- have the rapid hole sealing device of water blockoff Grouting Pipe, 8- water blockoff Grouting Pipe, the quick injection hole sealing dress of the soft plasticity of 9- It sets, the smooth umbrella of 10- annular is buckled, and the side 11- is buckled to inclined hole, 12- annular salient angle umbrella, 13- biconial pipe fitting, 14- slip casting hose.

Specific embodiment

By taking the deep hole pressure-bearing microexplosion grouting for water blocking under the conditions of 1 overlying strata water-bearing layer of rich water tunnel, 2 wide area rich water as an example, carries out and bore 3 slip casting of hole blocks operation and realizes that the wide area of the main water producing fractures 4 of country rock and time water producing fractures 5 blocks comprehensively.In conjunction with attached drawing to this hair It is bright to be further described:

As depicted in figs. 1 and 2, it is assumed that 1 wall rock drill-hole of rich water tunnel, 3 depth is 25m, bore diameter 100mm, and design is bored Injection hole sealing section 6 length in hole is 15m, arranges two groups of drillings 3 up and down, and adjacent drillhole blasting hole spacing keeps 1~3m, is selected solid Body explosive carries out coal petrography microexplosion increasing and splits, and selects the mine water of 2MPa as propagation of explosion medium.

Using deep hole pressure-bearing microexplosion method, preparatory powder charge is carried out to blast hole, and install liquid injection pipe (length 25m, outer diameter 10mm, internal diameter 6mm) and exhaust pipe (length 30m, outer diameter 10mm, internal diameter 6mm), it drills for facing upward, is in advance inserted into exhaust pipe Blasting boreholes bottom.Powder charge installing length is 2m in hole, and designated length is the primacord of 19m, and one end insertion well in advance is prevented In the hole of water in powder charge, bagging waterproof measure is carried out again, is filled in blast hole, and use flexible tubing (length 20m, outside Diameter 60mm, internal diameter 40mm) explosive is sent to predetermined position in hole, fluid injection is bundled for the concluding volume waterproof powder stick in blast hole Guan Hou is sent into blast hole according to identical loading method.

To have the selected water blockoff Grouting Pipe 8 of the rapid hole sealing device 7 of water blockoff Grouting Pipe in present case convenient for being intubated operation Bore be 45mm, length 25m, the bore of the soft quick injection hole sealing device 9 of plasticity is 70mm, length 18m.For having The rapid hole sealing device 7 of water blockoff Grouting Pipe is installed, and annular smooth umbrella is first buckled 10 and is covered by device end to the lateral inclined hole in end It is more than 11 positions；Then by water blockoff slip casting 8 by the front end insertion of the quick injection hole sealing device 9 of soft plasticity and by the side of device end 0.5~1.0m is drawn to inclined hole 11；Annular salient angle umbrella is buckled 12 again to be inserted in by the front end of water blockoff Grouting Pipe 8, it is fast to fill in soft plasticity Front end in fast 9 pipe of injection hole sealing device；Finally the intact device that finishes of combination is filled in injected hole, and by device end Annular smooth umbrella buckles 10 and is pushed into the position away from 0.2~0.5m of aperture along tube wall.

The quick injection hole sealing device 9 of soft plasticity and slip casting hose 14 are connected by biconial pipe fitting 13, is carried out porous same Walk injection hole sealing operation.After country rock sealing section grout cures, starts to fill the water blast hole, is vented operation, when exhaust pipe is held When continuous water outflow, the shut-off valve of exhaust pipe is closed, water injection pipe continues water filling pressurization, while binding primacord and detonator, to personnel After removing safety place, powder charge in hole is ignited.

After the completion of coal petrography deep hole pressure-bearing microexplosion operation, manual cleaning coal petrography blasting environment goes through drilling in coal and rock closure Situation takes secondary plugging in time for microexplosion punching drilling, after the secondary solidification of sealing section slurries, using biconial pipe fitting 13 connect water blockoff Grouting Pipe 8 and slip casting hose 14, carry out large space, comprehensive to coal and rock crack hole pattern and water producing fractures High-pressure slip-casting blocks operation.

It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, Several improvements and modifications can also be made, these modifications and embellishments should also be considered as the scope of protection of the present invention.In the present embodiment not The available prior art of specific each component part is realized.

Claims (8)

1. a wide-area underwater coal rock deep hole pressure-bearing micro-burst grouting water blocking method, is characterized in that: specifically comprise the following steps: 1) According to the specific water-rich mining area or tunnel construction conditions, clarify the space range of grouting and water blocking, design drilling layout parameters, and determine reasonable hole depth, hole spacing, horizon, inclination/elevation angle and aperture parameters; use high-power drilling rigs Carry out sequential drilling operations and strictly control the drilling accuracy of the drilling rig; 2) After the drilling arrangement is completed, before charging, the blasting hole should be cleaned in advance, the residual coal rock powder in the hole should be removed, the quantitative solid explosives should be loaded in sequence, the liquid injection pipe and the exhaust pipe should be installed simultaneously, and the detonating cord should be combined with the injection pipe. The liquid pipe and the exhaust pipe are arranged along the hole wall and lead out of the hole; 3) The flexible plastic rapid grouting and sealing device is used, and the porous synchronously performs rapid grouting and sealing operation on the sealing section of coal and rock, and the length of the sealing section is consistent; 4) After the slurry in the coal-rock sealing section is solidified, the porous synchronous liquid injection and exhaust operation are performed; when the liquid flow in the exhaust pipe continues to flow out, the closing valve of the exhaust pipe is closed, the injection pipe continues to inject liquid and pressurize, and at the same time, it is tied. Determine the detonating cord and detonator, carry out the connection operation of the gun line, and detonate the detonator and the explosives in the hole after the personnel are evacuated to a safe place; 5) After the explosives in the hole are detonated, check the plugging status of the coal and rock boreholes, and take secondary plugging in time for the micro-explosive punching holes. After the secondary solidification of the slurry in the plugging section, connect the water blocking grouting pipe to the high pressure The grouting pump performs large-space, all-round high-pressure grouting and plugging operations for blasting coal and rock mass. 2. The water-blocking method for wide-area underwater coal rock deep-hole pressure-bearing micro-burst grouting according to claim 1, characterized in that: in the step 1), drilling parameters are set, and the selected drilling diameter is 60 mm. ~100mm, and the length of the sealing hole is 40% to 60% of the total length of the drilled hole. 3. the water-blocking method for wide-area underwater coal rock deep-hole pressure-bearing micro-burst grouting according to claim 1, is characterized in that: in the described step 2), drilling charge and pipeline arrangement procedure, the upward tendency of Coal and rock drilling, the installation depth of the liquid injection pipe in the hole exceeds the sealing section by 0.1 ~ 0.3m, and the exhaust pipe is installed to the bottom of the hole; for drilling with a downward tendency, the liquid injection pipe is installed to the bottom of the hole, and the exhaust pipe is installed to the bottom of the hole. The pipe exceeds the drilling and sealing section by 0.1 to 0.3m. 4. The method for water blocking by microburst grouting under pressure in wide-area underwater coal rock deep holes according to claim 1, is characterized in that: in described step 2), the charge in the middle hole is less than the general charge in the full length of the borehole 1/3 of the blasting conditions, when using liquid explosives, choose low-energy, low-sensitivity liquid explosives, and the blasting energy equivalent of the explosives is lower than 1/3 of the blasting energy of rock explosives. 5. The method for water blocking by grouting and microburst grouting in deep-hole pressure-bearing microbursts in wide-area underwater coal rock according to claim 1, characterized in that: the flexible plastic rapid grouting and plugging device described in the step 3) is a A quick hole sealing device with a water blocking grouting pipe; The end of the quick hole sealing device with the water blocking grouting pipe is provided with a lateral inclined hole with a size matching the diameter of the grouting pipe, and the water blocking grouting pipe is led out from the lateral inclined hole and passes through the double cone at the end of the double pipe. Pipe joints achieve plugging and grouting effects; The water plugging grouting pipe and the flexible plastic rapid grouting hole sealing device are both flexible plastic pipes with slits, wherein the grouting pipe used for hole sealing is located in the coal rock sealing section, while the water blocking grouting pipe The slit position is outside the sealing section; For the installation of the rapid grouting and hole sealing device with the water blocking grouting pipe, the annular smooth umbrella buckle is first covered from the end of the device to above the position of the lateral inclined hole at the end; The front end of the grouting hole sealing device is inserted and drawn out from the lateral inclined hole at the end of the device for 0.5-1.0m; then the annular convex angle umbrella buckle is sleeved from the front end of the water blocking grouting pipe and inserted into the flexible plastic rapid grouting sealing hole The front end of the device pipe; finally, the assembled complete device is inserted into the grouting hole, and the annular smooth umbrella buckle at the end of the device is pushed along the pipe wall to a position of 0.2-0.5m away from the orifice. 6. The method for water blocking by micro-explosion grouting in deep-hole pressure-bearing micro-explosion in wide-area underwater coal rock according to claim 1, is characterized in that: described step 4) in-hole injection, exhaust and charge detonation procedure, In view of the conditions of high density of pores per unit cross-section of coal and rock mass or high degree of damage, liquid injection pipes with larger diameters should be selected to carry out porous synchronous liquid injection operations to ensure that the total amount of coal and rock liquid injection is higher than the liquid filtration loss; otherwise , the hole diameter of the injection line and the number of injection pipes should be reduced. 7. The water-blocking method for deep-hole pressure-bearing micro-burst grouting in wide-area underwater coal rock according to claim 1, is characterized in that: the liquid injected in the middle hole of described step 4) is divided into two categories, when the hole When the inner explosive is solid or condensed, the injected liquid is water or salt water; when using liquid explosive for blasting, the liquid explosive is directly used as the boosting medium, but it should have low sensitivity and sufficient stability. 8. The method for water blocking by grouting in deep-hole pressure-bearing microbursts in wide-area underwater coal rock according to claim 1, characterized in that: the follow-up high-pressure grouting water blocking operation in the step 5) is to be performed according to coal rock For the fluid loss of the body, select the grouting water plugging material with matching properties; for the condition of large fluid loss, select polyurethane or fast-expanding cement; for the condition of small fluid loss, select ordinary cement or mud as the material.