CN114002411A - Dynamic monitoring system and method for water inflow of coal seam with coal seam as main water-containing layer - Google Patents
Dynamic monitoring system and method for water inflow of coal seam with coal seam as main water-containing layer Download PDFInfo
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Abstract
The invention discloses a dynamic monitoring system and a dynamic monitoring method for the water inflow of a coal seam, wherein the coal seam mainly comprises a water layer, a two-dimensional analog simulation platform, a water supply system, a water inflow monitoring system and a stress monitoring system. The physical similarity simulation of the coal bed as a main water-containing layer under the fluid-solid coupling effect is realized, the theory and the technical system of high-strength safe mining of the special hydrogeological structure mining area are enriched, and the rapid and comprehensive development of mineral resource development is promoted.
Description
Technical Field
The invention relates to a dynamic monitoring system and a dynamic monitoring method for water inflow of a coal seam, in particular to a dynamic monitoring system for water inflow of a coal seam, which is suitable for a physical analog simulation test and takes the coal seam as a main water-containing layer.
Background
The coal bed is a main water-containing layer, is a rare mine hydrogeological structure found in a coal field, contains a large number of through cracks and is rich in water, and serious water hazard threat is caused to mine production. The physical model test is widely applied to coal mining problems as a test research means for effectively researching geology and engineering structures, and related researches on a physical simulation test system with a coal bed as a main water-containing layer are few in the past. In order to ensure high-strength safe mining of special hydrogeological structure mining areas, further research needs to be carried out on the problems of overburden, aquifer deformation and damage and seepage and water inrush processes of mining of coal seams under the condition that the coal seams are mainly water-bearing layers.
Disclosure of Invention
The technical problem is as follows: the invention aims to provide a dynamic monitoring system and a dynamic monitoring method for the water inflow of a coal seam with a main water-containing layer as a coal seam, which have the advantages of simple structure and convenient operation and are used for ensuring high-strength safe mining of a special hydrogeological structure mining area, aiming at solving the problems in the existing physical analog simulation test under the condition that the coal seam is the main water-containing layer.
The technical scheme is as follows: the invention discloses a dynamic monitoring system for water inflow of a coal seam with the coal seam as a main water-containing layer, which comprises a two-dimensional similar simulation platform, a water supply system, a water inflow monitoring system and a stress monitoring system, wherein the two-dimensional similar simulation platform is a multifunctional mining plane similar physical simulation test platform in which rock stratum similar simulation materials and coal seam prefabricated blocks are sequentially paved, and a vertical pressurizing oil cylinder for applying compensation load to a model is arranged at the upper part of the two-dimensional similar simulation platform; the water supply system is arranged on one side of the two-dimensional analog simulation platform and connected with a water injection pipe which is embedded in the coal bed precast block, the water inflow monitoring system is arranged at the position connected with the coal bed precast block, and the stress monitoring system comprises a plurality of pressure sensors which are arranged in the rock stratum analog simulation material at intervals and a stress acquisition instrument connected with the pressure sensors.
The rock stratum similar simulation material is a mixture prepared from quartz sand, calcium carbonate and gypsum according to a rock stratum similar ratio.
The coal seam precast block comprises a matrix test block, a water injection pipe, a water outlet pipe, a pipe cap, a waterproof gel coating and a waterproof adhesive tape; the water injection pipe and the parallel pre-buried inside the base member test block of outlet pipe, the mouth of pipe department of water injection pipe and outlet pipe both sides all is equipped with the pipe cap that seals exit, the mouth of pipe and the base member test block lateral wall of water injection pipe and outlet pipe both sides flush, evenly spaced apart on two pipe walls is equipped with a plurality of holes of permeating water that do benefit to the water delivery and the infiltration of material, the surface spraying of base member test block have waterproof gel layer and the winding waterproof adhesive tape in waterproof gel layer outside.
The matrix test block is prepared from quartz sand, calcium carbonate, gypsum, paraffin and vaseline according to a similar water physical ratio.
The length, width and height of the coal seam precast block are equal to the one-time excavation step distance, the width of the two-dimensional similar simulation platform and the height of the simulated coal seam.
The water supply system comprises a water supply hanging bottle, a water injection pipeline, a control water valve A and a fixed bracket; the number of the water supply hanging bottles is determined according to the number of the coal seam precast blocks, and the fixed height of the water supply hanging bottles is determined according to the similarity ratio of the coal seam water pressure measured on site; the water outlet of the water supply hanging bottle outlet control water valve is connected with the pipe orifice of a water injection pipe which is embedded inside the coal bed precast block through a water injection pipeline, so that water in the water supply hanging bottle can be injected into the coal bed precast block through the water injection pipeline, and the control water valve A is arranged on the water injection pipeline.
The water inflow monitoring system comprises a flowmeter, a water outlet pipeline and a control water valve B; one end of the water outlet pipeline is connected with a water outlet pipe orifice in the coal seam prefabricated block, a flowmeter is installed at the other end of the water outlet pipeline, the flowmeter is used for recording and measuring the change of the water quantity value in the prefabricated block, and the control water valve B is arranged on the water outlet pipeline.
The dynamic monitoring method for the water inflow of the coal seam with the coal seam as the main water-containing layer according to the dynamic monitoring system comprises the following steps:
1) laying a similar simulation model by using a two-dimensional similar simulation platform: determining the attributes of each rock stratum in the model according to the actual geological data of the coal mine, and combining the geometric parameters and the characteristic parameters of each rock stratum of the rock stratum material in the model according to a physical simulation criterion to prepare similar materials of each rock stratum;
2) constructing coal bed precast blocks, determining the geometric parameters and characteristic parameters of a coal bed, namely a water-containing layer material in a model according to a physical simulation criterion and a water physics similarity theory, preparing the coal bed precast blocks, determining the preparation number n of the coal bed precast blocks according to the excavation step pitch, and labeling the n coal bed precast blocks with the label K1…Kn；
3) Paving similar models according to the similar simulation parameters of each rock stratum of the models; when the prefabricated blocks are laid on the coal seam, the prefabricated blocks are marked by K1…KnSequentially arranging and stacking in the coal seam excavation direction for laying; embedding a plurality of stress sensors at designed positions in the model at intervals in the process of laying the rock stratum simulation material;
4) after the laid similar model is naturally air-dried, the installation of a stress monitoring system, a water supply system and a water inflow monitoring system is completed, each coal bed precast block is respectively connected with one set of water supply system and one set of water inflow monitoring system, and the water supply system and the water inflow monitoring system are respectively subjected to the step G1…GnAnd Y1…YnWherein, the control water valve A and the control water valve B on each set of water supply system and water inflow monitoring system are respectively marked as A1…AnAnd B1…Bn；
5) Before similar models are excavated, a vertical pressurizing oil cylinder is arranged at the upper part of a two-dimensional similar simulation platform to apply compensation load to the models;
6) excavating the coal bed according to the design scheme of the model, and prefabricating the coal bed block K1Before excavation, a water supply system G connected with each coal seam prefabricated block is opened1…GnControl water valve A to corresponding coal seam prefabricated block K1…KnInternal water injection, namely starting a water inflow monitoring system Y connected with each coal seam precast block after the internal water amount of all water supply hanging bottles is not changed1…YnThe control water valve B (20) enables seepage water in the precast block to flow out through the water outlet pipeline;
7) in the coal seam excavation process, observing and recording the deformation damage and stress state process of the overlying rock stratum, and simultaneously monitoring the change of the data L of the flow meter arranged on a water outlet pipeline);
8) then carrying out the next coal seam precast block K2Before excavation, water supply system G1And water inflow monitoring system Y1Dismantling and closing the control valve A2…AnAnd a control valve B2…BnSupplementing the water amount in each residual water supply hanging bottle, and repeating the steps 6) and 7) until the whole model is excavated;
9) in the whole experiment process, stress data sigma obtained by monitoring each stress sensor corresponds to water inflow data L obtained by a water inflow monitoring system arranged in a corresponding precast block through a stress acquisition instrument, a sigma-L curve is drawn, and the relation between the dynamic change L of the water inflow of the coal seam with the coal seam as a main water-containing layer and overburden stress sigma in a model is established, so that the dynamic monitoring of the water inflow of the coal seam is realized.
Has the advantages that: by adopting the technical scheme, the invention realizes physical similarity simulation of the coal bed as a main water-containing layer under the fluid-solid coupling effect, enriches the theory and the technical system of high-strength safe mining of special hydrogeological structure mining areas, and promotes the rapid and comprehensive development of mineral resource development. A water inrush (inrush) model of a mined coal seam is constructed by adopting a physical similarity simulation test method, and the water pressure change of the coal seam, the moving deformation of overlying strata, the fracture development process and the like under the mining condition of a caving method are monitored and recorded by combining a self-designed water injection and water inrush monitoring system, a strain monitor and a digital photographic technology, so that the ore pressure distribution characteristics and the relation with the water inrush of a coal body in the mining of the coal seam which is a main water-bearing layer are established. The method fills the blank of physical simulation test under the condition that the coal bed is the main water-containing layer, provides a new way for realizing the physical simulation research of the coal bed under the fluid-solid coupling effect on the main water-containing layer, has simple structure and convenient operation, ensures that the experimental result is closer to the practical engineering problem, and has wide practicability in the technical field.
Drawings
Fig. 1 is a schematic structural diagram of a dynamic monitoring system for water inflow of a coal seam with the coal seam as a main water-containing layer.
Fig. 2 is a schematic structural diagram of a coal seam, namely an aquifer precast block in the invention.
In the figure: 1-a two-dimensional analog simulation platform, 2-a water supply system, 3-a water inflow monitoring system, 4-a stress monitoring system, 5-a rock stratum analog simulation material, 6-a coal bed precast block, 7-a matrix test block, 8-a water injection pipe, 9-a water outlet pipe, 10-a pipe cap, 11-a waterproof gel coating, 12-a waterproof adhesive tape, 13-a water permeable hole, 14-a water supply hanging bottle, 15-a water injection pipeline, 16-a control water valve A, 17-a fixed support, 18-a flowmeter, 19-a water outlet pipeline, 20-a control water valve B, 21-a stress sensor, 22-a strain gauge and 23-a pressurizing oil cylinder.
Detailed Description
An embodiment of the invention is further described below with reference to the accompanying drawings:
the dynamic monitoring system for the water inflow of the coal seam mainly comprising a water layer comprises a two-dimensional similar simulation platform 1, a water supply system 2, a water inflow monitoring system 3 and a stress monitoring system 4, wherein the two-dimensional similar simulation platform 1 is a multifunctional mining plane similar physical simulation test platform in which rock stratum similar simulation materials 5 and coal seam precast blocks 6 are sequentially paved, the rock stratum similar simulation materials 5 are mixtures prepared by quartz sand, calcium carbonate and gypsum according to rock stratum similar proportions, and the rock stratum similar simulation materials 5 determine characteristic parameters of the materials according to physical simulation criteria so as to prepare the rock stratum similar materials. The coal seam precast block 6 comprises a matrix test block 7, a water injection pipe 8, a water outlet pipe 9, a pipe cap 10, a waterproof gel coating 11 and a waterproof adhesive tape 12; water injection pipe 8 and 9 parallel pre-buried inside base member test block 7 of outlet pipe, the mouth of pipe department of water injection pipe 8 and 9 both sides of outlet pipe all is equipped with the pipe cap 10 that seals exit, the mouth of pipe and the 7 lateral walls of base member test block of the mouth of pipe of water injection pipe 8 and 9 both sides of outlet pipe flush, evenly spaced apart on two pipe walls is equipped with a plurality of holes 13 of permeating water that do benefit to the water delivery and the infiltration of material, the surface coating of base member test block 7 have waterproof gel layer 11 and the winding waterproof tape 12 in waterproof gel layer outside, base member test block 7 form according to the similar proportion of water physics by quartz sand, calcium carbonate, gypsum, paraffin and vaseline. A vertical pressurizing oil cylinder 23 for applying compensation load to the model is arranged at the upper part of the two-dimensional similar simulation platform 1; the water supply system 2 is arranged on one side of the two-dimensional analog simulation platform 1 and is connected with a water injection pipe pre-embedded in the coal seam precast block 6, and the water supply system 2 comprises a water supply hanging bottle 14, a water injection pipeline 15, a control water valve A16 and a fixed support 17; the water supply hanging bottles 14 are fixed on the fixed support 17, the number of the water supply hanging bottles 14 is determined according to the number of the coal seam precast blocks 6, and the fixed height of the water supply hanging bottles 14 is determined according to the similarity ratio of the coal seam water pressure measured on site; the water outlet of the outlet control water valve of the water supply hanging bottle 14 is connected with the pipe orifice of a water injection pipe 8 pre-embedded in the coal seam precast block 6 through a water injection pipeline 15, so that a stable seepage water source is provided for the coal seam precast block 6, water in the water supply hanging bottle 14 can be injected into the coal seam precast block 6 through the water injection pipeline 15, and the water injection pipeline 15 is provided with a control water valve A16 capable of adjusting the water delivery quantity; the length, width and height of the coal seam precast block 6 are equal to the one-time excavation step distance, the width of the two-dimensional similar simulation platform and the height of the simulated coal seam. The water inflow monitoring system 3 is arranged at a position connected with the coal seam precast block 6, and the stress monitoring system 4 comprises a plurality of pressure sensors 21 arranged in the rock stratum similar simulation material 5 at intervals and a stress acquisition instrument 22 connected with the pressure sensors. The water inflow monitoring system 3 comprises a flow meter 18, a water outlet pipeline 19 and a control water valve B20; one end of the water outlet pipeline 19 is connected with the pipe orifice of the water outlet pipe 9 in the coal seam precast block 6, the pipe orifice at the other end is provided with a flow meter 18, the flow meter 18 is used for recording and measuring the numerical value change of the water quantity in the precast block 6, and the control water valve B20 is arranged on the water outlet pipeline 19.
The invention relates to a dynamic monitoring method for water inflow of a coal seam with a main water-containing layer, which comprises the following steps:
1) laying a similar simulation model by using a two-dimensional similar simulation platform 1: determining the attributes of each rock stratum in the model according to the actual geological data of the coal mine, and combining the geometric parameters and the characteristic parameters of each rock stratum of the rock stratum material in the model according to a physical simulation criterion to prepare similar materials of each rock stratum; selecting quartz sand as aggregate, calcium carbonate, gypsum, vaseline and paraffin as auxiliary materials, and designing a matching scheme of similar simulation materials according to an orthogonal test method;
2) constructing a coal seam precast block 6, determining the geometric parameters and the characteristic parameters of a coal seam, namely a water-containing layer material in a model according to a physical simulation criterion and a water physics similarity theory, and preparing the coal seam precast block 6, wherein the coal seam precast block 6 is formed by combining a base test block 7, a water injection pipe 8, a water outlet pipe 9, a pipe cap 10, a waterproof gel coating 11 and a waterproof adhesive tape 12; the number n of the coal bed precast blocks 6 is determined according to the excavation step pitch, and the n coal bed precast blocks are marked with K1…Kn(ii) a The coal seam precast block 6 is manufactured as follows:
a. selecting quartz sand as aggregate, calcium carbonate, gypsum, vaseline and paraffin as auxiliary materials, and designing a matching scheme of similar simulation materials according to an orthogonal test method;
b. weighing aggregate and auxiliary materials according to a pre-designed proportioning scheme and uniformly stirring the mixed aggregate; mixing paraffin and vaseline, heating for melting, pouring into the mixed aggregate, and stirring uniformly again;
c. making and molding the mixed material through a standard mold;
d. placing the demoulded test piece in a curing box for curing for 7 days for strength test;
e. the test piece after maintenance is soaked for 1h, 8h, 12h and 24h respectively to carry out water absorption and softening coefficient tests, and according to the test result, the similar simulation material proportion of the coal bed as the main water-containing layer is determined according to the physical simulation criterion and the similar theory of water physics;
f. repeating the step b according to the determined coal seam similar simulation material proportion;
g. making and molding the matrix test block 7 of the mixed material by a special mold; in the manufacturing process of the matrix test block 7, a water injection pipe 8 and a water outlet pipe 9 which are made of PVC materials are pre-embedded in the matrix test block 7, and the length of the pipe is 4/5 of the length of the matrix test block 7; the inner pipe orifices of the water injection pipe 8 and the water outlet pipe 9 are sealed by using a pipe cap 10, and the side part of the special die is drilled by drilling at the side part of the die, so that the outer pipe orifices of the water injection pipe 8 and the water outlet pipe 9 are flush with the side wall of the matrix test block 7; the water injection pipe 8 and the pipe wall of the water outlet pipe 9 are evenly provided with a plurality of water permeable holes 13 at intervals, which are beneficial to water delivery and water seepage of materials, and the hole quantity and the diameter of the water permeable holes 13 are designed according to actual water-bearing stratum permeability parameters.
h. After the matrix test block 7 is demoulded, spraying waterproof gel 11 on the surface, after air drying, winding waterproof adhesive tape 12 for water sealing treatment, and exposing the pipe orifices of the water injection pipe 8 and the water outlet pipe 9;
i. the length, width and height of the coal seam precast block 6 are equal to the one-time excavation step pitch, the width of the two-dimensional similar simulation platform and the height of the simulated coal seam, the manufacturing number is determined according to the excavation step pitch number, and the coal seam precast block is marked with the number K1…Kn；
3) Paving similar models according to the similar simulation parameters of each rock stratum of the models; when the prefabricated block 6 is laid on the coal seam, the prefabricated block 6 is marked with a mark K1…KnSequentially arranging and stacking in the coal seam excavation direction for laying; according to the experimental design, a plurality of stress sensors 21 are pre-embedded at the designed positions in the model at intervals in the process of laying the rock stratum simulation material (5);
4) after the laid similar model is naturally air-dried, connection pipeline connection among the water supply system 2, the water inflow monitoring system 3 and the coal bed precast blocks 6 and installation of the stress monitoring system 4 are completed, each coal bed precast block 6 is respectively connected with one set of water supply system 2 and one set of water inflow monitoring system 3, and the water supply system and the water inflow monitoring system are respectively subjected to a label G1…GnAnd Y1…YnWherein, the control water valve A16 and the control water valve B20 on each set of the water supply system 2 and the water inflow monitoring system 3 are respectively marked as A1…AnAnd B1…Bn(ii) a Each water supply hanging bottle 14 is fixed above the outer side of the model through a fixing support 17, and the fixing height is determined according to the actually measured coal bed water pressure on site and the similarity ratio;
5) before similar models are excavated, a vertical pressurizing oil cylinder 23 is arranged at the upper part of a two-dimensional similar simulation platform 1 to apply compensation load to the models;
6) excavating the coal bed according to the design scheme of the model, and prefabricating the coal bed block K1Before excavation, a water supply system G connected with each coal seam prefabricated block 6 is opened1…GnThe control water valve A16 is corresponding to the coal seam precast block K1…KnInternal water injection, after the water amount in all the water supply hanging bottles 14 is not changed, starting a water inflow monitoring system Y connected with each coal seam precast block 61…YnThe control water valve B20 enables seepage water in the precast block to flow out through the water outlet pipeline 19;
7) in the coal seam excavation process, observing and recording the deformation damage and stress state process of the overlying rock stratum, and simultaneously monitoring the data L change of a flow meter 18 arranged on a water outlet pipeline 19;
8) then carrying out the next coal seam precast block K2Before excavation, water supply system G1And water inflow monitoring system Y1Dismantling and closing the control valve A2…AnAnd a control valve B2…BnSupplementing the water amount in each residual water supply hanging bottle (14), and repeating the steps 6) and 7) until the whole model is excavated;
9) in the whole experiment process, stress data sigma obtained by monitoring each stress sensor 21 corresponds to water inflow data L obtained by a water inflow monitoring system 3 arranged in a corresponding precast block 6 through a stress acquisition instrument 22, a sigma-L curve is drawn, and the relation between the dynamic change L of the water inflow of the coal seam with a main water-bearing layer and the overburden stress sigma in the model is established, so that the dynamic monitoring of the water inflow of the coal seam is realized.
Claims (8)
1. The utility model provides a coal seam water inflow dynamic monitoring system for water layer is given first place to in coal seam, includes two-dimentional analog simulation platform (1), water supply system (2), water inflow monitoring system (3) and stress monitoring system (4), its characterized in that: the two-dimensional analog simulation platform (1) is a multifunctional mining plane analog physical simulation test platform with rock stratum analog simulation materials (5) and coal bed precast blocks (6) laid in sequence inside, and a vertical pressurizing oil cylinder (23) for applying compensation load to a model is arranged at the upper part of the two-dimensional analog simulation platform (1); water supply system (2) establish in one side of two-dimentional simulation platform (1), with pre-buried water injection pipe connection in coal seam prefabricated section (6) inside, gushing water yield monitoring system (3) establish in the position department that links to each other with coal seam prefabricated section (6), stress monitoring system (4) including the interval establish at the inside a plurality of pressure sensor (21) of rock stratum simulation material (5) and stress collection appearance (22) that link to each other with it.
2. The system of claim 1, wherein the dynamic monitoring system of water inflow of a coal seam is a main water-containing layer, and comprises: the rock stratum similarity simulation material (5) is a mixture prepared from quartz sand, calcium carbonate and gypsum according to rock stratum similarity ratio.
3. The system of claim 1, wherein the dynamic monitoring system of water inflow of a coal seam is a main water-containing layer, and comprises: the coal seam precast block (6) comprises a matrix test block (7), a water injection pipe (8), a water outlet pipe (9), a pipe cap (10), a waterproof gel coating (11) and a waterproof adhesive tape (12); water injection pipe (8) and outlet pipe (9) parallel pre-buried inside base member test block (7), the mouth of pipe department of water injection pipe (8) and outlet pipe (9) both sides all is equipped with seals pipe cap (10) of importing and exporting, the mouth of pipe and base member test block (7) lateral wall of water injection pipe (8) and outlet pipe (9) both sides flush, evenly spaced apart on two pipe walls is equipped with a plurality of holes (13) of permeating water that do benefit to the water delivery and the infiltration of material, the surface coating of base member test block (7) have waterproof gel layer (11) and twine waterproof adhesive tape (12) outside waterproof gel layer.
4. The system of claim 3, wherein the dynamic monitoring system comprises: the matrix test block (7) is prepared from quartz sand, calcium carbonate, gypsum, paraffin and vaseline according to a similar water physical ratio.
5. The system of claim 1, wherein the dynamic monitoring system of water inflow of a coal seam is a main water-containing layer, and comprises: the length, width and height of the coal seam precast block (6) are equal to the one-time excavation step distance, the width of the two-dimensional similar simulation platform and the height of the simulated coal seam.
6. The system of claim 1, wherein the dynamic monitoring system of water inflow of a coal seam is a main water-containing layer, and comprises: the water supply system (2) comprises a water supply hanging bottle (14), a water injection pipeline (15), a control water valve A (16) and a fixed bracket (17) which are combined together; the water supply hanging bottles (14) are fixed on the fixed support (17), the number of the water supply hanging bottles (14) is determined according to the number of the coal seam precast blocks (6), and the fixed height of the water supply hanging bottles (14) is determined according to the similarity ratio of the coal seam water pressure measured on site; the water outlet of the outlet control water valve of the water supply hanging bottle (14) is connected with the pipe orifice of a water injection pipe (8) pre-buried in the coal seam precast block (6) through a water injection pipeline (15), so that water in the water supply hanging bottle (14) can be injected into the coal seam precast block (6) through the water injection pipeline (15), and the control water valve A (16) is arranged on the water injection pipeline (15).
7. The system of claim 1, wherein the dynamic monitoring system of water inflow of a coal seam is a main water-containing layer, and comprises: the water inflow monitoring system (3) comprises a flow meter (18), a water outlet pipeline (19) and a control water valve B (20); one end of the water outlet pipeline (19) is connected with a pipe orifice of the water outlet pipe (9) in the coal seam precast block (6), a flow meter (18) is installed at the pipe orifice at the other end, the flow meter (18) is used for recording and measuring the change of the water quantity numerical value in the precast block (6), and the control water valve B (20) is arranged on the water outlet pipeline (19).
8. The dynamic monitoring method for the water inflow of the coal seam with the coal seam as the main water-containing layer of the dynamic monitoring system according to any one of claims 1 to 7 is characterized by comprising the following steps:
1) laying a similar simulation model by using a two-dimensional similar simulation platform (1): determining the attributes of each rock stratum in the model according to the actual geological data of the coal mine, and combining the geometric parameters and the characteristic parameters of each rock stratum of the rock stratum material in the model according to a physical simulation criterion to prepare similar materials of each rock stratum;
2) structure of the organizationBuilding a coal bed precast block (6), determining the geometric parameters and the characteristic parameters of a coal bed, namely a water-bearing layer material in a model according to a physical simulation criterion and a water physics similarity theory, preparing the coal bed precast block (6), determining the preparation number n of the coal bed precast block (6) according to the excavation step distance, and marking the n coal bed precast blocks with the label K1…Kn；
3) Paving similar models according to the similar simulation parameters of each rock stratum of the models; when the prefabricated block (6) is laid on the coal seam, the prefabricated block (6) is marked as K1…KnSequentially arranging and stacking in the coal seam excavation direction for laying; embedding a plurality of stress sensors (21) at intervals in the design position in the model in the process of laying the rock stratum analog simulation material (5);
4) after the laid similar model is naturally air-dried, the stress monitoring system (4), the water supply system (2) and the water inflow monitoring system are installed, each coal bed prefabricated block (6) is respectively connected with one set of water supply system (2) and one set of water inflow monitoring system (3), and the water supply system and the water inflow monitoring system are respectively marked with G1…GnAnd Y1…YnWherein, the control water valve A (16) and the control water valve B (20) on each set of the water supply system (2) and the water inflow monitoring system (3) are respectively marked as A1…AnAnd B1…Bn；
5) Before similar models are excavated, a vertical pressurizing oil cylinder (23) is arranged at the upper part of a two-dimensional similar simulation platform (1) to apply compensation load to the models;
6) excavating the coal bed according to the design scheme of the model, and prefabricating the coal bed block K1Before excavation, a water supply system G connected with each coal seam prefabricated block (6) is started1…GnThe control water valve A (16) corresponding to the coal seam precast block K1…KnInternal water injection, namely starting a water inflow monitoring system Y connected with each coal seam precast block (6) after the internal water amount of all the water supply hanging bottles (14) is not changed1…YnThe control water valve B (20) enables seepage water in the precast block to flow out through the water outlet pipeline (19);
7) in the coal seam excavation process, the deformation damage and stress state process of the overlying strata is observed and recorded, and the data L change of a flowmeter (18) arranged on a water outlet pipeline (19) is monitored;
8) then carrying out the next coal seam precast block K2Before excavation, water supply system G1And water inflow monitoring system Y1Dismantling and closing the control valve A2…AnAnd a control valve B2…BnSupplementing the water amount in each residual water supply hanging bottle (14), and repeating the steps 6) and 7) until the whole model is excavated;
9) in the whole experiment process, stress data sigma obtained by monitoring each stress sensor (21) corresponds to water inflow data L obtained by a water inflow monitoring system (3) arranged in a corresponding precast block (6) through a stress acquisition instrument (22), a sigma-L curve is drawn, and the relation between the dynamic change L of the water inflow of the coal seam mainly comprising a water layer and the overburden stress sigma in the model is established, so that the dynamic monitoring of the water inflow of the coal seam is realized.
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| CN115826034A (en) * | 2022-09-30 | 2023-03-21 | 山东科技大学 | Method and device for coal mine earthquake generation and vibration wave response monitoring thereof |
| CN116183465A (en) * | 2023-04-23 | 2023-05-30 | 太原理工大学 | Mine water permeability similar simulation experiment device and method |
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