CN110793672A - Fully mechanized caving mining device for extra-thick coal seam based on floor deformation monitoring system - Google Patents

Abstract

The invention relates to a device for indoor simulation of geological conditions and mining conditions during coal seam mining, in particular to a fully-mechanized caving mining device for extra-thick coal seams based on a floor deformation monitoring system. The invention provides a device for monitoring the deformation damage and even the depth of destruction at different depths of the floor during fully-mechanized caving mining of extra-thick coal seams in a room, so as to monitor the stress and strain data at different depths of the mining floor in real time, and solve the problem that the current field measurement workload is large, Construction and testing difficult lamp disadvantages. The invention includes three parts, the first part is the model frame system device, the second part is the stress and strain sensor arrangement design, and the third part is the data acquisition and receiving device. The invention is convenient for indoor simulation, integrates three parts, and the ratio of similar materials can be adjusted according to needs; the data can be collected and analyzed in real time according to the mining progress, the calculation data is easy to obtain and convenient to process, and the comparative analysis is carried out according to the stress and strain data. , mutual verification of the reliability of the test results.

Description

Fully mechanized caving mining device for extra-thick coal seam based on floor deformation monitoring system

technical field

The invention relates to a device for indoor simulation of geological conditions and mining conditions during coal seam mining, in particular to a fully-mechanized caving mining device for extra-thick coal seams based on a floor deformation monitoring system.

Background technique

At present, the similarity theory is used to simulate the height of the mining roof caving zone and the water-conducting fracture zone, but there are relatively few studies on the deformation and damage of the bottom floor under the action of mining pressure. A similar simulation device and monitoring system for the deformation, damage and failure depth of the mining floor are carried out. To this end, it is necessary to develop a set of monitoring systems in one set to simulate the deformation and damage of the floor in fully mechanized caving mining of extra-thick coal seams.

SUMMARY OF THE INVENTION

In order to overcome the lack of research on the deformation and damage of the floor under the action of mining pressure, and the lack of similar simulation devices and monitoring systems for the deformation, damage and damage depth of the mining floor under the condition of fully-mechanized caving in deep and extra-thick coal seams, this paper The purpose of the invention is to provide a device for monitoring the deformation, damage and even the depth of damage to the floor at different depths in the fully mechanized caving mining of extra-thick coal seams, so as to monitor the stress and strain data at different depths of the mining floor in real time, and solve the current on-site measurement workload. Large, difficult to construct and test lamp disadvantages.

The present invention is realized by adopting the following technical solutions: a fully mechanized caving mining device for extra-thick coal seams based on a floor deformation monitoring system, including a model frame system device and a stress-strain sensor arrangement design;

The structure of the model frame system is as follows:

The first is the overall frame structure design of the model:

(1) The internal length, width and height of the model are 4000×300×1600mm;

(2) The length, width and height of the baffles on the left and right sides of the model are 50×300×1600mm, and the thickness is 50mm thick steel plate;

(3) The length and width of the baffle at the bottom of the model is 5000×300mm, and the thickness is 20mm thick steel plate;

(4) The length and width of the top cover of the model is 3800×280mm, and the thickness is 10mm steel plate;

Followed by the front and rear baffle structure design

(1) The front and rear baffles are horizontally placed in the shape of a sink, and are fixed on the model from bottom to top with screws at both ends of the back. installation and removal;

(2) The front and rear baffles are made of 10mm thick steel plate, the length and height are 5000×20mm, and the 50mm eaves are extended up and down;

(3) Three screw holes with a diameter of 20mm are opened at a distance of 1000mm up and down symmetrically in the middle of the 50mm eaves extending up and down along the length direction;

(4) Holes are opened at both ends of each front and rear baffle from bottom to top, the center of the first hole is 30mm from the bottom, the diameter of the hole is 30mm, and the distance between the centers of the two holes is 140mm;

Finally, the size design of the baffle openings on the left and right sides

(1) The bottoms of the left and right baffles are symmetrically welded on the steel plate at the bottom of the model. According to the height of the front and rear baffles and the size of the openings, the front and rear of the left and right baffles must be opened according to the positions of the two ends of the front and rear baffles in advance. Make openings so that they can be fixed with screws;

(2) The baffles on the left and right sides are opened from bottom to top, two holes are in one cycle, the center of the first hole is 30mm from the bottom, the diameter of the hole is 30mm, and the distance between the centers of the two holes is 140mm; the distance between the top of the second hole is 60mm, and then the first hole is opened The three holes are similar in sequence, so that they can correspond to the openings at both ends of the front and rear baffles, and are easy to fix with screws;

(3) There are 16 screw holes with a diameter of 30mm on each side of the baffles on the left and right sides, a total of 64 screw holes;

The second part is the layout design of the stress-strain sensor

The first is the model longitudinal section design:

(1) The length of the model is 4000mm, and the height is built according to the actual simulated geological and mining conditions of a certain working face in the mine;

(2) Leave 300-500mm to protect coal pillars at the left and right ends of the model, and then arrange four monitoring lines in sequence from the incision to the stop line, that is, the length of the model. The distance between the first three monitoring lines is 700-900mm, The distance between the two monitoring lines is 1500-1700mm;

(3) 4-6 stress sensors and 8-12 strain sensors are respectively arranged on each monitoring line. The stress sensors are arranged in typical formations, and the strain sensors are arranged at a distance of 25-35mm from top to bottom;

Followed by the horizontal sensor layout design

(1) According to the positions of the four monitoring lines, the strain sensor and the stress sensor are arranged in sequence at a distance of 100mm from the front baffle or the rear baffle in the lateral direction;

(2) The distance between two sensors on the same monitoring section and on the same horizontal plane is 100mm;

The data collected by the stress sensor and the strain sensor are collected and processed in real time with the help of a computer and a data acquisition instrument.

The model design includes two parts: the frame structure model and the internal experimental model. The structural parameters corresponding to these two models are obtained through accurate calculation, which are very close to the actual situation of fully mechanized caving mining of extra-thick coal seams. The simulation results can effectively guide the roadway floor support on site. At the same time, the stress and strain sensors embedded in the model can be used to track and monitor the stress and strain of the coal seam floor at different depths during the mining process at any time, so as to accurately quantify and judge the mined coal seam floor. Deformation damage and failure depth characteristics at different depths.

The invention is an extra-thick coal seam mining device based on the characteristics of convenient indoor simulation, combined with the actual geology and mining conditions studied, and based on the bottom plate deformation monitoring system, which can real-time stress and strain on different depths of the bottom plate during the mining process. monitor. Through the similarity theory, the ratio of similar materials in the room is carried out, and the stress and strain sensors embedded in the model can be used to track and monitor the stress and strain of the coal seam floor at different depths during the mining process at any time, so as to accurately quantify and judge the mining. Deformation damage and failure depth characteristics of coal seam floor at different depths. The device is especially suitable for the inconvenient on-site monitoring of the fully mechanized caving floor of the deep and extra-thick coal seam, and then simulates the deformation and damage of the mining floor and even the depth of the damage in the room according to the similar theory.

The invention is convenient for indoor simulation, integrates three parts, and the ratio of similar materials can be adjusted according to needs; the data can be collected and analyzed in real time according to the mining progress, the calculation data is easy to obtain and convenient to process, and the comparative analysis is carried out according to the stress and strain data. , to mutually verify the reliability of the test results.

Description of drawings

FIG. 1 is a schematic diagram of the framework of the integrated device of the present invention.

Figure 2 is a model diagram of the front and rear side baffles of the present invention.

Fig. 3 is a longitudinal section model diagram of a similar material test established according to the present invention for the geological conditions of the study area.

FIG. 4 is a model diagram of a sensor arrangement in a cross-section of a similar material of the present invention.

Detailed ways

The invention includes three parts, the first part is the model frame system device, the second part is the stress and strain sensor arrangement design, and the third part is the data acquisition and receiving device.

The first part is the design of the model frame system device, which is described in detail in combination with the successful cases in Tongxin Mine of Datong Coal Mine Group:

The first is the overall frame structure design of the model (as shown in Figure 1):

(1) The internal length, width and height of the model are 4000×300×1600mm;

(2) The length, width and height of the baffles on the left and right sides of the model are 50×300×1600mm, and the thickness is 50mm thick steel plate;

(3) The length and width of the baffle at the bottom of the model is 5000×300mm, and the thickness is 20mm thick steel plate;

(4) The length and width of the top cover plate of the model is 3800×280mm, and the thickness is 10mm steel plate, which is convenient for applying equivalent load (7.5MPa), so that the whole model is uniformly stressed.

Followed by the front and rear baffle structure design (as shown in Figure 2)

(1) The baffle is in the shape of a horizontal sink, and it is fixed on the model from bottom to top with screws at both ends of the back. disassemble;

(2) The baffle is made of 10mm thick steel plate, the length and height are 5000×20mm, and the upper and lower extension is 50mm for screw fixing connection to prevent similar materials from falling;

(3) Three screw holes with a diameter of 20mm shall be opened at a distance of 50mm between the upper and lower eaves of the trough according to the 1000mm vertical symmetry;

(4) Holes are opened from bottom to top at both ends of each baffle. The center of the first hole is 30mm from the bottom, the diameter of the hole is 30mm, and the distance between the centers of the two holes is 140mm.

Finally, the size design of the baffle openings on the left and right sides

(1) The bottoms of the left and right baffles are symmetrically welded on the steel plate at the bottom of the model. According to the height of the front and rear baffles and the size of the openings, the front and rear of the left and right baffles must be opened according to the positions of the two ends of the front and rear baffles in advance. Make openings so that they can be fixed with screws;

(2) The baffles on both sides are opened from bottom to top, two holes are in one cycle, the center of the first hole is 30mm from the bottom, the diameter of the hole is 30mm, and the distance between the centers of the two holes is 140mm; the distance between the top of the second hole is 60mm, and then the third hole is opened. Each hole is similar in sequence, so that it can correspond to the openings at both ends of the front and rear baffles, and it is easy to fix with screws;

(3) There are 16 screw holes with a diameter of 30mm on each side of the baffle on both sides, a total of 64 screw holes.

The second part is the layout design of the stress-strain sensor, which is explained in detail based on the successful cases in Tongxin Mine of Datong Coal Mine Group:

The first is the model longitudinal section design:

(1) The length and height of the model is based on the geological conditions of the pre-mining working face of Tongxin Mine of Datong Coal Mine Group, and the length and height dimensions are 4000×1520mm;

(2) 400mm of protective coal pillars should be reserved for mining coal seams at both ends of the model (along the length of the model, that is, the left and right directions in Figure 3), and then four monitoring lines should be arranged in sequence from the incision hole to the mining stop line. The distance between the first three monitoring lines Both are 800mm, and the distance between the last two monitoring lines is 1600mm;

(3) 5 stress sensors and 10 strain sensors are respectively arranged on each monitoring line. The stress sensors are arranged in typical strata, and the strain sensors are arranged at a distance of 30mm from top to bottom. .

Followed by the horizontal sensor layout design (as shown in Figure 4)

(1) According to the positions of the four monitoring lines, the strain sensors and stress sensors are arranged in sequence at a distance of 100mm from the boundary in the lateral direction (that is, in the front-rear direction).

(2) The distance between the two sensors is 100mm.

The third part mainly realizes the functions of data acquisition, processing and query with the help of high-performance computer and data acquisition instrument.

Claims (3)

1. A deep coal seam fully mechanized caving mining device based on a bottom plate deformation monitoring system is characterized by comprising a model frame system device and a stress-strain sensor arrangement design;

the model frame system device structure is as follows:

firstly, designing the integral framework structure of the model:

(1) the length, width and height inside the model are 4000 multiplied by 300 multiplied by 1600 mm;

(2) the length, width and height of the baffle plates at the left side and the right side of the model are 50 multiplied by 300 multiplied by 1600mm, and a thick steel plate with the thickness of 50mm is used;

(3) the length and width of the baffle at the bottom of the model are 5000 multiplied by 300mm, and a steel plate with the thickness of 20mm is used;

(4) the length and width of the cover plate at the top of the model are 3800 mm multiplied by 280mm, and the thickness of the cover plate is 10 mm;

secondly, the design of the front and the rear baffle plates

(1) The front baffle and the rear baffle are both in a transverse water tank shape, the back of the front baffle and the rear baffle are fixed on the model from bottom to top in sequence by screws at two ends, and meanwhile, the upper part and the lower part of each two baffles are connected and fixed by three screws with the diameter of 20mm, so that the front baffle and the rear baffle are convenient to mount and dismount;

(2) the front baffle and the rear baffle are processed and manufactured by a thick steel plate with the thickness of 10mm, the length and the height are 5000 multiplied by 20mm, and the front baffle and the rear baffle extend out of 50mm groove eaves from top to bottom;

(3) three screw holes with the diameter of 20mm are respectively formed in the middle of the groove eaves extending out of 50mm up and down along the length direction at intervals of 1000mm in an up-down symmetrical mode;

(4) two ends of each front baffle and each rear baffle are provided with holes from bottom to top, the center of the first hole is 30mm away from the bottom, the diameter of the hole is 30mm, and the center distance between the two holes is 140 mm;

finally, the size of the opening of the left and right baffle plates is designed

(1) The bottoms of the left and right side baffles are symmetrically welded on a steel plate at the bottom of the model, and holes are formed in the front and the back of the left and right side baffles according to the heights of the front and back side baffles and the sizes of the holes, so that the left and right side baffles can be fixed by screws;

(2) the left baffle and the right baffle are provided with holes from bottom to top, the two holes are formed in one period, the center of the first hole is 30mm away from the bottom, the diameter of the hole is 30mm, and the center distance between the two holes is 140 mm; a third hole is formed in the second hole at the interval of 60mm, and the steps are performed similarly in sequence, so that the third hole corresponds to the holes in the two ends of the front baffle and the rear baffle and is fixed conveniently by screws;

(3) the front and the back of each side of the left baffle plate and the right baffle plate are respectively provided with 16 screw holes with the diameter of 30mm, and the total number of the screw holes is 64;

the second part is designed for stress strain sensor arrangement

Firstly, designing a longitudinal section of a model:

(1) the length of the model is 4000mm, and the height of the model is set up according to the geology and the mining condition of a certain working face of the mine which is actually simulated;

(2) respectively reserving 300-sand-doped 500-mm protective coal pillars in mining coal seams at the left end and the right end of the model, and then sequentially arranging four monitoring lines from the hole cutting direction to the mining stopping line direction, namely the length direction of the model, wherein the distance between the first three monitoring lines is 700-sand-doped 900mm, and the distance between the second two monitoring lines is 1500-sand-doped 1700 mm;

(3) 4-6 stress sensors and 8-12 strain sensors are respectively distributed on each monitoring line, the stress sensors are distributed on a typical stratum, and the strain sensors are distributed at intervals of 25-35mm from top to bottom;

secondly, the design of the transverse sensor arrangement

(1) According to the positions of the four monitoring lines, strain sensors and stress sensors are sequentially distributed at a distance of 100mm from the front baffle or the rear baffle in the transverse direction;

(2) the distance between two sensors on the same monitoring section and the same horizontal plane is 100 mm;

and acquiring data acquired by the stress sensor and the strain sensor in real time by using a computer and a data acquisition instrument and processing the data.

2. The fully mechanized caving mining device for extra-thick coal seams based on the floor deformation monitoring system according to claim 1, wherein the equivalent load applied by the top cover plate is 6.5-8.5 MPa.

3. The fully mechanized caving mining device of the extra-thick coal seam based on the floor deformation monitoring system according to claim 1 or 2, wherein the strain sensor adopts a resistance strain gauge, and the stress sensor adopts an earth pressure cell.

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