Coal mine underground reservoir in-situ environment water-force coupling effect simulation device

Abstract

The utility model discloses a coal mine underground reservoir in-situ environment water-force coupling effect simulation device which comprises an installation seat, at least one water-force coupling pressure chamber and a jacking mechanism which is arranged in the installation seat and drives the water-force coupling pressure chamber to ascend and descend, a counter-force frame is installed on the installation seat, and a load sensor is fixed on the counter-force frame. The top of the water-force coupling pressure chamber is provided with a dowel bar which penetrates into the water-force coupling pressure chamber and applies pressure to a sample placed in the water-force coupling pressure chamber; the top of the water-force coupling pressure chamber is provided with a gas channel communicated with the interior of the water-force coupling pressure chamber, and the bottom of the water-force coupling pressure chamber is provided with a water flow channel for a water source to enter and discharge; the gas channel is connected with an exhaust valve through a pipeline; the water flow channel is communicated with a water supply and drainage system; the jacking mechanism, the exhaust valve and the water supply and drainage system are all connected with the controller.

Description

TECHNICAL FIELD

[0001] The utility model relates to coal mine underground in situ environment simulation device, concretely relates to a coal mine underground reservoir in situ environment water -power coupling effect simulation device. BACKGROUND

[0002] The mine pumped storage power station utilizes the abandoned roadway and goaf left after coal mining as underground space, constructs pumped storage power plant and power generation device, can not only make full use of, reinforce underground space, prevent surface subsidence, be favorable to environmental protection, but also can be used as one of efficient energy storage technologies. The stability of the coal pillar dam body as the core water storage structure of the goaf has important significance for water storage performance and construction of the pumped storage power station in the later period.

[0003] Different from the surface dam body, as the pumped storage power station, the working condition of the coal pillar dam body of the coal mine underground reservoir is extremely complex, the coal and rock mass is subjected to the coupling effect of in situ stress and underground water, and further faces the influence of water pressure circulation and other external disturbances generated by long-term service and high-frequency cycle water storage, which further aggravates the risk of underground mine floor caving, large deformation and other disasters, and affects the service life of the pumped storage power station.

[0004] In order to study the stability of the coal pillar dam body, the prior art adopts a uniaxial creep device 1 shown in Figure 1 for uniaxial creep experiment on the sample in the coal pillar dam body, and the device includes an equipment bearing part, a hydraulic system part, a console and a computer control system, and the three parts are described as follows:

[0005] The equipment bearing part includes a 60T counterforce frame 10, a 60T jack (i.e. a jacking mechanism 3), a 60T load sensor 7 and a mounting seat 5. The 60T counterforce frame 10 is connected with the 60T load sensor 7, the mounting seat 5 is connected with a displacement sensor 11, a sample 12 is placed on the base, and the load and displacement are applied to the sample 12 through the 60T jack.

[0006] The hydraulic system part: the 60T jack is pressurized by oil supply through pipelines, wherein the upper cavity and the lower cavity are respectively provided with two pipeline oil supplies, the oil tank is connected with the upper cavity and the lower cavity of the jack through four oil supply pipelines after passing through a low-pressure oil pump, a one-way valve and a filter, and the oil tank pipeline is also provided with a safety valve to protect the pipeline safety; at the same time, two pipelines are arranged for oil suction and supply of the electric cylinder to stabilize the oil pressure, and the oil suction and supply pipelines of the electric cylinder are connected with an electric booster and a pressure sensor. The 60T jack is pushed by oil pressure.

[0007] The console and the computer control system: the system can select manual or automatic control mode to control the instrument to apply displacement or load, and can display the current load and sample displacement in real time.

[0008] In use, the uniaxial creep device realizes axial loading stability function by fixing applied load or fixed displacement, so as to observe uniaxial creep phenomenon of the sample. From the composition structure of the device, it can be seen that it can only simulate uniaxial creep phenomenon of the sample, and for the creep experiment of the coal pillar dam under the condition of cyclic water storage and release, the immersion condition can only be simply simulated by previously performing the cyclic immersion and drying process on the sample. This experimental method is difficult to objectively reflect the coupling effect of the cyclic water storage and release disturbance and the in-situ stress factor, and is difficult to guarantee the undisturbed characteristics of the coal pillar dam. Meanwhile, the existing device can only experiment on one sample at a time, and cannot simultaneously simulate the effect of multiple cyclic water storage and release times, and the experimental efficiency is low. Content of the utility model

[0009] In view of the above-mentioned deficiencies in the prior art, the coal mine underground reservoir in-situ environment water-force coupling simulation device provided by the utility model solves the problem that the existing creep experimental instrument cannot perform in-situ stress and cyclic water storage and release disturbance coupling experiment.

[0010] In order to achieve the above-mentioned purposes, the utility model adopts the technical scheme that:

[0011] The utility model provides a coal mine underground reservoir in-situ environment water-force coupling simulation device, which comprises a mounting seat, at least one water-force coupling pressure chamber and a jacking mechanism placed in the mounting seat with the water-force coupling pressure chamber being lifted, a counterforce frame is installed on the mounting seat, and a load sensor is fixed on the counterforce frame; the top of the water-force coupling pressure chamber is provided with a force transmission rod penetrating into the interior thereof and applying pressure to the sample placed in the interior; the top of the water-force coupling pressure chamber is provided with a gas passage in communication with the interior of the water-force coupling pressure chamber, and the bottom is provided with a water flow passage for water inlet and outlet; the gas passage is connected with an exhaust valve through a pipeline, and the water flow passage is in communication with a water supply and drainage system; the jacking mechanism, the exhaust valve and the water supply and drainage system are connected with a controller.

[0012] Further, the water-force coupling pressure chamber comprises a transparent cylinder body and an upper cover and a base seat sealingly connected with both ends of the transparent cylinder body, the gas passage is arranged on the upper cover, and the water flow passage is arranged on the base seat; a plurality of bolts for improving the sealing property of the water-force coupling pressure chamber are installed between the upper cover and the base seat; the force transmission rod penetrates through the upper cover and contacts the sample in the water-force coupling pressure chamber.

[0013] Further, the base seat comprises a first step for installing the transparent cylinder body, a second step for sealingly connecting with the inner side wall of the transparent cylinder body and a third step for placing the sample, which are sequentially arranged from bottom to top.

[0014] Further, the upper cover and the base seat are both provided with a sealing ring in contact with the inner side wall of the transparent cylinder body.

[0015] Further, the top end face of the force transmission rod is provided with an arc-shaped groove, and a centering top head in contact with the load sensor is arranged in the arc-shaped groove, and the end part of the centering top head in the arc-shaped groove is a semicircular ball head.

[0016] Further, the force transmission rod and the base are both provided with a groove for embedding the sample at one end thereof.

[0017] Further, the water supply and drainage system comprises water pipes in communication with the water flow channels of each water-force coupling pressure chamber, each water pipe being in communication with a water inlet pipe and a drainage pipe; a water injection valve and a drainage valve are arranged on each water inlet pipe and each drainage pipe, all the water injection valves are connected with a total water inlet pipe through pipes, all the drainage valves are connected with a total drainage pipe through pipes, and the water injection valves and the drainage valves are connected with the controller.

[0018] Further, a total pipe switch valve, a pressure reducing valve and a total pressure sensor connected with the controller are sequentially arranged on the total water inlet pipe; and a pressure sensor connected with the controller is arranged on each water inlet pipe.

[0019] Further, the coal mine underground reservoir in-situ environment water-force coupling simulation device further comprises a water receiving disc placed at the bottom of the mounting seat, each water-force coupling pressure chamber is placed in a water receiving disc, and the water receiving disc is in communication with the total drainage pipe through pipes; and the outlet of the exhaust valve is located in the water receiving disc.

[0020] Further, the jacking mechanism is a 60T jack, the counterforce frame is a 60T self counterforce frame, and the load sensor is a 60T load sensor.

[0021] The beneficial effects of the utility model are as follows: the utility model can carry out uniaxial creep experiments on samples through pressure chambers, and water can be introduced into the pressure chambers to simulate the disturbance effect of cyclic water storage and drainage, that is, the in-situ stress and the disturbance effect of cyclic water storage and drainage can be simultaneously applied to the samples, the coupling effect of the real in-situ complex environment of the mine pumped storage power station can be restored more than the traditional experiment of carrying out the cyclic water immersion treatment on the samples in advance, and the experimental reliability is improved; the utility model can set multiple pressure chambers, different in-situ stresses and multiple different disturbance effects of cyclic water storage and drainage can be simultaneously applied, and the experimental efficiency is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structural schematic view of the prior art uniaxial creep device.

[0023] Figure 2 It is a schematic view of the coal mine underground reservoir in-situ environment water-force coupling simulation device.

[0024] Figure 3 It is a schematic view of the water-force coupling pressure chamber and the water supply and drainage system after being connected.

[0025] Figure 4 Structure diagram of water-force coupling pressure chamber.

[0026] 1, single shaft creep device; 11, displacement sensor; 12, sample; 2, water-force coupling pressure chamber; 21, gas channel; 22, water flow channel; 23, transparent cylinder; 24, upper cover; 25, base; 251, first step; 252, second step; 253, third step; 26, bolt; 27, sealing ring; 3, jacking mechanism; 4, water supply and drainage system; 41, water injection valve; 42, drainage valve; 43, main pipeline on-off valve; 44, pressure reducing valve; 45, total pressure sensor; 46, pressure sensor; 5, mounting seat; 6, force transmission rod; 61, arc-shaped groove; 62, groove; 63, truing top head; 7, load sensor; 8, exhaust valve; 9, water pan; 10, counterforce frame. DETAILED DESCRIPTION

[0027] The specific embodiments of the utility model are described below to facilitate the understanding of the utility model by the person skilled in the art, but it should be clear that the utility model is not limited to the scope of the specific embodiments, and for the person skilled in the ordinary skill in the art, as long as various changes are within the spirit and scope of the utility model defined and determined by the appended claims, these changes are obvious, and all the utility model creations utilizing the utility model concept are within the scope of protection.

[0028] As Figure 2 shown, the coal mine underground reservoir in-situ environment water-force coupling simulation device provided by the scheme comprises a mounting seat 5, at least one water-force coupling pressure chamber 2 and a jacking mechanism 3 placed in the mounting seat 5 and lifting the water-force coupling pressure chamber 2, the jacking mechanism 3 is connected with an external oil supply system, and power is provided by the external oil supply system when starting. The scheme is preferably provided with a plurality of water-force coupling pressure chambers 2, so that different in-situ stresses and a plurality of different cyclic water storage and drainage disturbances are simultaneously applied to different pressure chambers, and the efficiency of the experiment is greatly improved.

[0029] The mounting seat 5 is provided with a counterforce frame 10, and the counterforce frame 10 is fixed with a load sensor 7; the top of the water-force coupling pressure chamber 2 is provided with a force transmission rod 6 penetrating into the interior of the water-force coupling pressure chamber 2 and applying pressure to the sample 12 placed in the interior; the top of the water-force coupling pressure chamber 2 is provided with a gas channel 21 in communication with the interior of the water-force coupling pressure chamber 2, and the bottom is provided with a water flow channel 22 for water inlet and outlet; the gas channel 21 is connected with an exhaust valve 8 through a pipeline, and the water flow channel 22 is in communication with a water supply and drainage system 4; the jacking mechanism 3, the exhaust valve 8 and the water supply and drainage system 4 are connected with a controller, which is preferably a computer or a PLC controller. The jacking mechanism 3 is a 60T jack, the counterforce frame 10 is a 60T self-counterforce frame, and the load sensor 7 is a 60T load sensor 7.

[0030] When performing uniaxial creep experiment, the use method of the device is that the jacking mechanism 3 moves upward with the pressure chamber, when the force transmission rod 6 contacts with the load sensor 7, the jacking mechanism 3 continues to move upward with the pressure chamber, at this time, the force transmission rod 6 moves downward to apply pressure to the sample 12 in the pressure chamber, so as to realize uniaxial creep experiment.

[0031] When performing uniaxial creep and cyclic water storage and drainage experiment, the use method of the device is that the controller starts the water supply and drainage system 4 to inject water into the pressure chamber, and stops water supply when water flows out of the exhaust valve 8. After a certain pressure maintaining time, the water supply and drainage system 4 is started to discharge water in the pressure chamber, and then the jacking mechanism 3 is started. The process is completely the same as the uniaxial creep experiment, and will not be repeated here. After completion, the jacking mechanism 3 is reset. According to experimental requirements, the last operation can be repeated many times, for example, a single cycle process of ten thousand times can be set. In order to ensure the experimental effect, the interval time of water injection and drainage cannot be too short, and the water injection and drainage control is 5-10 times per hour at most.

[0032] The simulation device of the scheme can also inject water into the pressure chamber while applying pressure to the sample according to user requirements, and perform uniaxial creep test on the sample in water environment. After the pressure is maintained for a predetermined time, the water in the pressure chamber is discharged after pressure relief. Then the above steps are repeated until the desired test number is reached.

[0033] As shown in Figure 3 and Figure 4 , in implementation, the water-force coupling pressure chamber 2 preferably includes a transparent cylinder 23, an upper cover 24 and a base 25 sealingly connected to both ends of the transparent cylinder 23, the gas channel 21 is arranged on the upper cover 24, and the water flow channel 22 is arranged on the base 25. The transparent cylinder 23 can facilitate observation of the change of the sample 12 under pressure. A plurality of bolts 26 for improving the sealing performance of the water-force coupling pressure chamber 2 are arranged between the upper cover 24 and the base 25, and the force generated by the confining pressure is also borne by the bolts 26. The force transmission rod 6 penetrates through the upper cover 24 and contacts with the sample 12 in the water-force coupling pressure chamber 2.

[0034] In implementation, the force transmission rod 6 and the base 25 are preferably provided with recesses 62 for embedding the sample 12 at one end of the sample 12; when the experiment is performed, the two ends of the sample 12 are respectively installed in the recesses 62, so that the stability of the sample 12 can be ensured.

[0035] The base 25 preferably comprises a first step 251 for installing the transparent cylinder 23, a second step 252 for sealingly connecting with the inner side wall of the transparent cylinder 23, and a third step 253 for placing the sample 12, which are sequentially arranged from bottom to top; after the base 25 is arranged in this way, the transparent cylinder 23 can be conveniently fixed with the base 25, and the space for containing water between the sample 12 and the transparent cylinder 23 can also be ensured.

[0036] The upper cover 24 and the base 25 are both provided with sealing rings 27 in contact with the inner side wall of the transparent cylinder 23, which can ensure the sealing property of the pressure chamber; the top end surface of the force transmission rod 6 is provided with an arc-shaped recess 61, the arc-shaped recess 61 is provided with a centering top head 63 in contact with the load sensor 7, and the end part of the centering top head 63 located in the arc-shaped recess 61 is a semicircular ball head; the cooperation of the arc-shaped recess 61 and the semicircular ball head can ensure the centering of the applied pressure.

[0037] As shown in Figure 3 The water drainage system 4 comprises water pipes in communication with the water flow passages 22 of each water-force coupling pressure chamber 2, each water pipe is in communication with a water inlet pipe and a water outlet pipe; each water inlet pipe and each water outlet pipe is provided with a water filling valve 41 and a water drainage valve 42, all the water filling valves 41 are connected with a total water inlet pipe through pipes, all the water drainage valves 42 are connected with a total water outlet pipe through pipes, and the water filling valves 41 and the water drainage valves 42 are connected with a controller. The total water inlet pipe is sequentially provided with a total pipe switch valve 43, a pressure reducing valve 44 and a total pressure sensor 45 connected with the controller; each water inlet pipe is provided with a pressure sensor 46 connected with the controller.

[0038] In implementation, the coal mine underground reservoir in-situ environment water-force coupling simulation device preferably further comprises a water receiving tray 9 placed at the bottom of the mounting seat 5, the main function of the water receiving tray 9 is to prevent water from flowing onto the instrument during disassembly; each water-force coupling pressure chamber 2 is placed in a water receiving tray 9, and the water receiving tray 9 is in communication with the total water outlet pipe through pipes, so that the water in the water receiving tray 9 is directly drained to the total water outlet pipe.

[0039] The outlet of the exhaust valve 8 is located in the water receiving tray 9, so that the liquid discharged by the exhaust valve 8 can be collected to prevent it from flowing onto the instrument and damaging the instrument. In order to facilitate the monitoring of the moving distance of the jacking mechanism 3, a displacement sensor 11 connected with the controller is further arranged between the water receiving tray 9 and the load sensor 7.

[0040] In summary, the simulation device solves the problem that the conventional creep experimental instrument cannot objectively reflect the in-situ stress and the coupling effect of the cyclic water storage and release disturbance in the occurrence environment factors of the coal pillar dam body of the coal mine underground reservoir.

Claims

1. A simulation device for in-situ environmental hydro-mechanical coupling of a coal mine underground reservoir, characterized in that, The utility model provides a water -force coupling pressure chamber and the lifting mechanism of placing with water -force coupling pressure chamber in the mounting seat, and the mounting seat is provided with the counterforce frame on, and the counterforce frame is fixed with the load sensor, the water -force coupling pressure chamber's top is provided with the force transmission rod that goes into its inside and applies the pressure to the sample placed in the inside, the water -force coupling pressure chamber's top is provided with the gas passage that communicates with its inside, and the bottom is provided with the water flow channel that supplies water source and discharges, the gas passage is connected with the exhaust valve through the pipeline, and the water flow channel communicates with the water supply and drainage system, the lifting mechanism, exhaust valve and water supply and drainage system are connected with the controller.

2. The in-situ hydro-environmental coupling simulation device for coal mine underground reservoirs according to claim 1, characterized in that, The water -force coupling pressure chamber includes a transparent cylinder, an upper cover and a base that are sealingly connected to both ends of the transparent cylinder, the gas passage is provided on the upper cover, and the water flow channel is provided on the base; a plurality of bolts for improving the sealing performance of the water -force coupling pressure chamber are installed between the upper cover and the base; the force transmission rod passes through the upper cover and contacts the sample in the water -force coupling pressure chamber.

3. The in-situ hydro-environmental coupling simulation device for coal mine underground reservoirs of claim 2, characterized in that, The base includes a first step for mounting the transparent cylinder, a second step for sealingly connecting to the inner side wall of the transparent cylinder, and a third step for placing the sample, which are sequentially arranged from bottom to top.

4. The in-situ hydro-environmental coupling simulation device for coal mine underground reservoirs of claim 2, characterized in that, Both the upper cover and the base are provided with a sealing ring that contacts the inner side wall of the transparent cylinder.

5. The in-situ hydro-environmental coupling simulation device for coal mine underground reservoirs according to claim 1, characterized in that, The top end surface of the force transmission rod is provided with an arc-shaped groove, a self-aligning top head that contacts the load sensor is arranged in the arc-shaped groove, and the end of the self-aligning top head in the arc-shaped groove is a semicircular ball head.

6. The in-situ hydro-environmental coupling simulation device for coal mine underground reservoirs according to any one of claims 2-4, characterized in that, Both the force transmission rod and the base are provided with a groove for embedding the sample at the end facing the sample.

7. The in-situ hydro-environmental coupling simulation device for coal mine underground reservoirs according to claim 1, characterized in that, The water supply and drainage system includes water pipes that communicate with the water flow channels of each water -force coupling pressure chamber, each water pipe communicates with a water inlet pipe and a drainage pipe; each water inlet pipe and each drainage pipe is provided with a water filling valve and a drainage valve, all water filling valves are connected to a total water inlet pipe through pipes, all drainage valves are connected to a total drainage pipe through pipes, and the water filling valve and the drainage valve are connected to the controller.

8. The in-situ hydro-environmental coupling simulation device for coal mine underground reservoirs according to claim 7, characterized in that, A total pipe switch valve, a pressure reducing valve and a total pressure sensor connected to the controller are sequentially arranged on the total water inlet pipe; a pressure sensor connected to the controller is arranged on each water inlet pipe.

9. The in-situ hydro-environmental coupling simulation device for coal mine underground reservoirs according to claim 7 or 8, characterized in that, A water collecting tray is placed at the bottom of the mounting seat, each water -force coupling pressure chamber is placed in a water collecting tray, the water collecting tray communicates with the total drainage pipe through pipes, and the outlet of the exhaust valve is located in the water collecting tray.

10. The in-situ hydro-environmental coupling simulation device for coal mine underground reservoirs according to any one of claims 1-5, 7-8, characterized in that, The lifting mechanism is a 60T jack, the counterforce frame is a 60T self-counterforce frame, and the load sensor is a 60T load sensor.

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