CN110793672A - Ultra-thick coal seam fully mechanized caving mining device based on bottom plate deformation monitoring system - Google Patents

Ultra-thick coal seam fully mechanized caving mining device based on bottom plate deformation monitoring system Download PDF

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Publication number
CN110793672A
CN110793672A CN201911105561.7A CN201911105561A CN110793672A CN 110793672 A CN110793672 A CN 110793672A CN 201911105561 A CN201911105561 A CN 201911105561A CN 110793672 A CN110793672 A CN 110793672A
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baffle
model
mining
holes
stress
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CN201911105561.7A
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CN110793672B (en
Inventor
段宏飞
刘锦荣
朱术云
张郑伟
尚雁文
张卫强
贾清华
王少卿
贾渊
苏铭
孙浩
张冠宇
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China University of Mining and Technology CUMT
Datong Coal Mine Group Co Ltd
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China University of Mining and Technology CUMT
Datong Coal Mine Group Co Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00Measuring force or stress, in general
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00Measuring arrangements or details thereof in so far as they are not adapted to particular types of measuring means of the preceding groups
    • G01B21/32Measuring arrangements or details thereof in so far as they are not adapted to particular types of measuring means of the preceding groups for measuring the deformation in a solid

Abstract

The invention relates to a device for simulating geological conditions and mining conditions in mining of a coal seam indoors, in particular to a fully mechanized caving mining device for an extra-thick coal seam based on a bottom plate deformation monitoring system. The invention provides a device for monitoring deformation damage and even damage depth of a bottom plate in indoor fully mechanized caving mining of an extra-thick coal seam, which is used for monitoring stress and strain data of different depths of the mining bottom plate in real time and solving the problems of large workload, difficult construction and test and the like in field actual measurement at present. The device comprises a three-part device, wherein the first part is a model frame system device, the second part is designed for arranging stress strain sensors, and the third part is a data acquisition and receiving device. The invention is convenient to simulate indoors, integrates three parts into a whole, and can allocate similar material proportions according to requirements; data can be collected and analyzed in real time according to the mining progress, calculated data are easy to obtain and convenient to process, comparison and analysis are carried out according to stress and strain data, and reliability of test results is verified mutually.

Description

Ultra-thick coal seam fully mechanized caving mining device based on bottom plate deformation monitoring system
Technical Field
The invention relates to a device for simulating geological conditions and mining conditions in mining of a coal seam indoors, in particular to a fully mechanized caving mining device for an extra-thick coal seam based on a bottom plate deformation monitoring system.
Background
At present, the simulation of the heights of a mining roof caving zone and a water diversion fracture zone by adopting a similar theory is relatively more, the research on the deformation damage aspect of a bottom plate under the mining ore pressure action is relatively less, and a similar simulation device and a monitoring system for the deformation damage and the damage depth aspect of the mining bottom plate under the deep ultra-thick coal seam fully mechanized caving mining condition are lacked. Therefore, a simulation device for deformation damage similar materials of the fully mechanized caving mining bottom plate of the ultra-thick coal seam integrating a monitoring system is needed to be developed, and real-time monitoring of deformation damage and even damage of the bottom plate is carried out through strain and strain data acquisition in the mining process.
Disclosure of Invention
The invention aims to provide a device for monitoring deformation damage and damage depth of a bottom plate in indoor fully mechanized caving mining of an extra-thick coal seam, so as to monitor stress and strain data of different depths of the mining bottom plate in real time and solve the problems of large workload, difficult construction and test and adverse factors of the existing field actual measurement.
The invention is realized by adopting the following technical scheme: a fully mechanized caving mining device for an extra-thick coal seam based on a bottom plate deformation monitoring system comprises 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.
The model design comprises a frame structure model and an internal experiment model, the structural parameters corresponding to the two models are obtained through accurate calculation and are very close to the actual situation of fully mechanized caving mining of the ultra-thick coal seam, and the simulation result can effectively guide the on-site roadway floor support, the stope floor management and the like; meanwhile, stress and strain sensors which are embedded in the model in advance are utilized, the stress and strain conditions of different depths of the coal seam floor can be tracked and monitored at any time in the mining process, and therefore the deformation damage and the damage depth characteristics of the different depths of the mined coal seam floor can be accurately and quantitatively judged.
The invention relates to an ultra-thick coal seam mining device which integrates a bottom plate deformation monitoring system by combining the characteristics of convenient simulation indoors and the actual geological and mining conditions of research, and can monitor the stress and the strain of bottom plates at different depths in real time in the mining process. Through similar theory, carry out the ratio of indoor similar material, utilize stress and strain sensor buried underground in advance in the model, can carry out the tracking monitoring coal seam bottom plate different degree of depth stress and the strain condition of mining in-process at any time to accurate quantification judges the different degree of depth deformation damage of coal seam bottom plate of exploitation and destroys the degree of depth characteristic. The device is particularly suitable for inconvenient on-site monitoring of the deep underground ultra-thick coal seam fully mechanized caving mining bottom plate, and then the situation that the mining bottom plate is deformed, damaged or even damaged in depth is simulated indoors according to a similar theory.
The invention is convenient to simulate indoors, integrates three parts into a whole, and can allocate similar material proportions according to requirements; data can be collected and analyzed in real time according to the mining progress, calculated data are easy to obtain and convenient to process, comparison and analysis are carried out according to stress and strain data, and reliability of test results is verified mutually.
Drawings
FIG. 1 is a schematic diagram of an integrated device framework of the present invention.
FIG. 2 is a schematic view of a front and rear side baffle of the present invention.
FIG. 3 is a vertical section model diagram of a similar material test established for geological conditions of a study area according to the invention.
FIG. 4 is a schematic diagram of a cross-sectional sensor layout model of a similar material of the present invention.
Detailed Description
The device comprises a three-part device, wherein the first part is a model frame system device, the second part is designed for arranging stress strain sensors, and the third part is a data acquisition and receiving device.
The first part is the design of model frame system, which combines with the successful case of Xin-mine by the same coal mine group to make concrete description:
firstly, designing the overall framework structure of the model (shown in figure 1):
(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 steel plate is 10mm, so that the equivalent load (7.5MPa) can be conveniently applied, and the whole stress of the model is uniform.
Secondly, the structure design of the front and the back baffles (shown in figure 2)
(1) The baffles are in a horizontal water tank shape, the back surfaces of the baffles are fixed on the model from bottom to top in sequence by screws at two ends, and 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 installation and the disassembly are convenient;
(2) the baffle is made of a steel plate with the thickness of 10mm, the length and the height of the baffle are 5000 multiplied by 20mm, and the baffle extends out 50mm up and down and is used for fixing and connecting screws to prevent similar materials from scattering;
(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 according to the vertical symmetry of 1000 mm;
(4) and two ends of each baffle plate 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 baffle plates on the two sides 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 two side baffles 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 the stress strain sensor layout design, which combines the successful case of the same Xin mine of the same coal mine group to make concrete description:
firstly, designing a longitudinal section of a model:
(1) the model length and height is based on geological conditions of a mining working face of the same Xin mine of the same coal mine group as a background, and the length and height dimension is 4000 multiplied by 1520 mm;
(2) 400mm protective coal pillars (along the length direction of the model, namely the left and right direction in fig. 3) are reserved on the mined coal seams at the two ends of the model respectively, then four monitoring lines are sequentially arranged from the cutting hole to the mining stopping line direction, the distance between the first three monitoring lines is 800mm, and the distance between the second two monitoring lines is 1600 mm;
(3) 5 stress sensors and 10 strain sensors are respectively arranged on each monitoring line, the stress sensors are arranged on typical strata, the distance between the strain sensors from top to bottom is 30mm, and the first layer of the coal seam direct floor is arranged in the middle of the mudstone.
Secondly, the design of the transverse sensor arrangement (as shown in figure 4)
(1) According to the positions of the four monitoring lines, strain sensors and stress sensors are sequentially arranged at a distance of 100mm from a boundary in the transverse direction (namely in the front-back direction);
(2) the distance between the two sensors is 100 mm.
The third part mainly realizes the functions of data acquisition, processing, query and the like by means of a high-performance computer and a 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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