Quick drainage test device for accumulated water in goaf

Abstract

The utility model discloses a quick drainage test device for accumulated water in a goaf. The quick drainage test device comprises an experimental tank; the fissure zone is arranged on the inner side of the experimental tank, and a caving zone is arranged on the lower surface of the fissure zone; the water-resisting layer is arranged on the lower surface of the caving zone, and an undulating supporting surface is arranged on the water-resisting layer; the rock layer is arranged on the lower surface of the water-resisting layer; according to the method, through a multi-coal-seam simulation experiment, a goaf accumulated water roadway capable of rapidly draining the previous horizontal water is designed at the lower part of a mined coal seam or among coal seams according to the fluctuation condition of a horizontal accumulated water bottom plate of a previous panel, a drainage test drill site is designed at the corresponding position of a low-lying area of a previous horizontal working face, and a plurality of upward drainage drill holes are formed in the drill site; the simulation system not only solves the problem of time-space contradiction between excavation and drainage of goaf water in the same level, but also provides a new way for rapid drainage of the goaf water and rapid production replacement.

Description

Technical Field

[0001] The utility model specifically relates to a rapid drainage test device for goaf water accumulation. Background Technique

[0002] In some areas, there are many deep-buried Jurassic coal seams, with small coal seam dip angles and good occurrence conditions, and the resources are very rich. After the coal seam in the working face is mined, the caving zone and fracture zone formed have a hydraulic connection with the overlying aquifer. Due to the deep burial, wide distribution and good recharge conditions of the Cretaceous and Jurassic aquifers, the water filling time in the goaf is long, resulting in continuous goaf water accumulation. This not only causes the continuous increase of the mine water inflow, but more importantly, it poses varying degrees of threats to the mining and excavation processes of the adjacent working faces in the goaf.

[0003] To ensure the safety of mining and excavation in the working face, in the past, traditional treatment methods were used to drain and dewater the goaf by means of water exploration and drainage projects at the low-lying areas of the working face in the same horizontal panel, reducing the water head pressure of the goaf water accumulation and the pressure on the reserved coal pillars to meet the requirements of coal mine water control. However, due to the large amount of water recharge, it is difficult to determine the water level and water pressure of the adjacent goaf in a short time, which affects the mining and excavation progress and production succession, and is not convenient for simulating the actual situation of goaf water drainage to judge the drainage effect. Therefore, we propose a rapid drainage test device for goaf water accumulation. Content of the Utility Model

[0004] The purpose of the utility model is to provide a rapid drainage test device for goaf water accumulation to solve the problem that it is not convenient to simulate the actual situation of goaf water drainage during coal seam mining as mentioned in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A rapid drainage test device for goaf water accumulation, including:

[0006] An experimental tank;

[0007] A fracture zone, arranged inside the experimental tank, and the lower surface of the fracture zone has a caving zone;

[0008] An aquitard, arranged on the lower surface of the caving zone, and the aquitard has an undulating support surface;

[0009] A rock layer, arranged on the lower surface of the aquitard;

[0010] A roadway, opened inside the rock layer to drain water to the outside of the experimental tank, and a drill yard is vertically arranged on the side wall of the roadway;

[0011] Drainage holes, arranged on the drill yard, and one end of the drainage hole corresponds to the lower part of the support surface;

[0012] A water supply assembly, arranged on one side of the experimental tank to supply water to the inside of the experimental tank during the experiment.

[0013] Preferably, the water supply assembly includes a water storage tank, a water pump, a return pipe, a water outlet pipe and an overflow tank. The water storage tank is arranged on one side of the experimental tank, and the overflow tank is fixed on the water storage tank through a bracket. The return pipe and the water outlet pipe are arranged side by side on the lower surface of the overflow tank, and the lower ends of the return pipe and the water outlet pipe both extend into the interior of the water storage tank. A water pump for conveying water to the water outlet pipe is arranged at the bottom end inside the water storage tank. One end of the lower surface of the overflow tank is provided with a water inlet pipe communicating with the interior of the experimental tank.

[0014] Preferably, a first flowmeter is arranged on the water inlet pipe to detect the inflow water volume.

[0015] Preferably, the overflow tank is rectangular, a baffle for separating its internal space is arranged in the middle inside the overflow tank, and the water outlet pipe and the return pipe are arranged on both sides of the partition board.

[0016] Preferably, observation holes for observing the water level are arranged inside the water isolation layer, and one end of the observation hole corresponds to the caving zone.

[0017] Preferably, a plurality of the observation holes and water discharge holes are arranged, and a piezometric tube for detecting the internal water pressure is arranged at the lower end on one side of the water discharge hole.

[0018] Preferably, a plurality of the drilling sites are evenly distributed along the length direction of the roadway.

[0019] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0020] Through the multi-seam simulation experiment, in the lower part of the mined seam or between seams, according to the undulation of the water accumulation floor of the upper panel horizontal, a roadway for quickly discharging the goaf water of the upper level is designed, and at the corresponding position of the low-lying area of the upper level working face, a water discharge test drilling site is designed. A number of upward water discharge and drainage boreholes are arranged in the drilling site, forming a rapid drainage of the goaf water that does not affect the mining working face. This simulation system not only solves the spatio-temporal contradiction between the excavation and drainage of the goaf water in the same level, but also provides a new way for quickly discharging the goaf water and solving the rapid production succession. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of the present utility model.

[0022] In the figure: 1. Water storage tank; 2. Water pump; 3. Return pipe; 4. Water outlet pipe; 5. Overflow tank; 6. First flowmeter; 7. Roadway; 8. Water discharge hole; 9. Observation hole; 10. Drilling site; 11. Water isolation layer; 12. Caving zone; 13. Fracture zone. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] Please refer to Figure 1 , the present invention provides a technical solution: a goaf water rapid drainage test device, including:

[0025] Experimental tank;

[0026] Fracture zone 13, arranged inside the experimental tank, the lower surface of the fracture zone 13 has a caving zone 12, and the caving zone 12 and the fracture zone 13 are simulated aquifers using sand from thick to fine.

[0027] Impervious layer 11, arranged on the lower surface of the caving zone 12, and the impervious layer 11 has an undulating support surface.

[0028] Rock layer, arranged on the lower surface of the impervious layer 11 to simulate the coal series bottom layer.

[0029] Tunnel 7, opened inside the rock layer to drain water to the outside of the experimental tank, and a drill site 10 is vertically arranged on the side wall of the tunnel 7, which can be simulated using plexiglass materials.

[0030] Drainage hole 8, arranged on the drill site 10, and one end of the drainage hole 8 corresponds to the low point of the support surface to facilitate draining the accumulated water in the aquifer.

[0031] Water supply assembly, arranged on one side of the experimental tank to supply water into the experimental tank during the experiment, facilitating the replenishment of water to simulate the accumulated water situation.

[0032] In this embodiment, preferably, the water supply assembly includes a water storage tank 1, a water pump 2, a return pipe 3, a water outlet pipe 4 and an overflow tank 5. The water storage tank 1 is arranged on one side of the experimental tank, and an overflow tank 5 is fixed on the water storage tank 1 through a bracket. The return pipe 3 and the water outlet pipe 4 are arranged side by side on the lower surface of the overflow tank 5, and the lower ends of the return pipe 3 and the water outlet pipe 4 both extend into the interior of the water storage tank 1. A water pump 2 for conveying water to the water outlet pipe 4 is arranged at the bottom end inside the water storage tank 1. One end of the lower surface of the overflow tank 5 is provided with a water inlet pipe communicating with the inside of the experimental tank, facilitating the injection of water into the inner side of the experimental tank to simulate different degrees of accumulated water situations.

[0033] In this embodiment, preferably, a first flowmeter 6 is arranged on the water inlet pipe to detect the inflow water volume, facilitating the detection of the water volume entering the inner side of the experimental tank.

[0034] In this embodiment, preferably, the overflow tank 5 is rectangular, and a baffle for separating its internal space is provided in the middle of the inner side of the overflow tank 5. The water outlet pipe 4 and the water return pipe 3 are arranged on both sides of the partition board, which is convenient for adjusting the height of the baffle to adjust the amount of water escaping into the inner side of the experimental tank to test different water levels.

[0035] In this embodiment, preferably, an observation hole 9 for observing the water level is provided inside the water isolation layer 11, and one end of the observation hole 9 corresponds to the caving zone 12, which is convenient for observing the water level situation through the observation hole 9 and further understanding the drainage effect.

[0036] In this embodiment, preferably, a plurality of observation holes 9 and water discharge holes 8 are provided. A piezometer tube for detecting the internal water pressure is provided at the lower end of one side of the water discharge hole 8.

[0037] In this embodiment, preferably, a plurality of drill sites 10 are evenly distributed along the length direction of the roadway 7.

[0038] The working principle and usage process of the present utility model: When in use, by adjusting the water level height of the overflow tank 5, the caving zone 12 and the fracture zone 13 of the goaf aquifer are filled with water and maintain a certain water level value and water pressure. When continuously adjusting the water level height of the overflow tank 5 upward, the goaf aquifer changes from a non-pressure state to a confined state. Then, open the water discharge hole at the bottom of the roadway 7, and use a flowmeter to measure the water discharge in real time. At the same time, use the observation hole 9 to observe the continuous change of the water level in real time, detect the water pressure through the piezometer tube, draw the relationship curves of flow rate, water pressure, water level and time, and reveal the dynamic change process of the goaf water accumulation; finally, the water filling coefficient of the goaf water accumulation can also be calculated according to the relationship between the water inflow, water discharge and goaf water accumulation.

[0039] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A test device for rapid drainage of water from a mined-out area, characterized in that: include: Experimental tank; A fracture zone (13) is arranged inside the test tank, and a collapse zone (12) is provided on the lower surface of the fracture zone (13); A waterproof layer (11) is arranged on the lower surface of the collapse zone (12), and the waterproof layer (11) has an undulating support surface; A rock layer disposed on the lower surface of the aquiclude (11); A tunnel (7) is opened inside the rock layer to discharge water to the outside of the experimental tank, and a drilling site (10) is arranged perpendicularly to the side wall of the tunnel (7); A drain hole (8) is arranged on the drilling site (10), and one end of the drain hole (8) corresponds to the lower part of the support surface; The water supply component is arranged at one side of the experimental tank to supply water to the inside of the experimental tank during the experiment.

2. A quick drainage test device for mined water according to claim 1, characterized in that: The water supply assembly comprises a water storage tank (1), a water pump (2), a water return pipe (3), a water outlet pipe (4) and an overflow tank (5); the water storage tank (1) is arranged on one side of the experimental tank, and the overflow tank (5) is fixed on the water storage tank (1) by a bracket; the water return pipe (3) and the water outlet pipe (4) are arranged side by side on the lower surface of the overflow tank (5), and the lower ends of the water return pipe (3) and the water outlet pipe (4) both extend into the water storage tank (1); a water pump (2) for delivering water to the water outlet pipe (4) is arranged at the bottom end of the inner side of the water storage tank (1); and a water inlet pipe is arranged at one end of the lower surface of the overflow tank (5) and is connected to the inside of the experimental tank.

3. A quick drainage test device for mined water according to claim 2, characterized in that: The water inlet pipe is provided with a first flow meter (6) to detect the amount of inflowing water.

4. A quick drainage test device for mined water according to claim 2, characterized in that: The overflow trough (5) is rectangular, and a baffle is provided in the middle of the inner side of the overflow trough (5) to separate the internal space thereof, and the water outlet pipe (4) and the water return pipe (3) are arranged on both sides of the baffle.

5. The device for rapid drainage of water from a mined-out cavity according to claim 1, characterized in that: An observation hole (9) for observing the water level is arranged inside the waterproof layer (11), and one end of the observation hole (9) corresponds to the collapse zone (12).

6. A quick drainage test device for mined-out water according to claim 5, characterized in that: A plurality of observation holes (9) and drain holes (8) are provided, and a pressure measuring tube for detecting the internal water pressure is provided at the lower end of one side of the drain hole (8).

7. The device for rapid drainage of mined-out water according to claim 1, characterized in that: A plurality of drilling sites (10) are evenly distributed along the length direction of the tunnel (7).

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