Simulation test device and method for multi-angle tilt drilling grouting technology for coal seam bottom plate under effect of pressure-bearing flowing water

Abstract

The invention discloses a simulation test device and method for a multi-angle tilt drilling grouting technology for a coal seam bottom plate under the effect of pressure-bearing flowing water. The simulation test device comprises a test rack, a pressure-bearing aquifer water source applying device, multi-angle drilling and different hole diameter fracture simulation devices and a grouting device;the test rack is used for bearing the multi-angle drilling and different hole diameter fracture simulation device; the multi-angle drilling and different hole diameter fracture simulation devices aredivided into multiple sets according to drilling angles and the sizes of fractures; the pressure-bearing aquifer water source applying device comprises a constant-pressure water pump, a water pressureadjusting valve, an open source fracture and sealed fracture control valve and a flowmeter; and the grouting device comprises a grouting machine, a safety valve, a slurry flushing valve, a grouting channel valve, a grouting hole selecting switch and a disassembly-free flushing valve. According to the simulation test device, simulation of a grouting process layout process, simulation of a dynamicprocess of slurry flowing to diffusion, simulation of drilling tilt angles to the slurry diffusion influence, and scenario simulation of precipitation and condensation mechanisms can be achieved.

Description

technical field

[0001] The invention relates to a multi-hole multi-dip angle combined grouting process simulation experiment device based on the grouting hole arrangement process. Background technique

[0002] In the process of coal mining, the coal seam is seriously threatened by the confined water in the floor aquifer, and the water inrush coefficient is high. How to prevent the water inrush from the floor confined water is an important problem to ensure safe production of the working face. In particular, some aquifers with sufficient water sources but difficult to evacuate seriously affect mine production; the key to on-site implementation is often to choose floor grouting. At present, the theory of grouting diffusion radius is an empirical formula recognized by industry experts, and is widely used in mine grouting engineering. However, the grouting process and grouting mechanism of deeper multiple boreholes still need to be studied. For example, although the floor grou...

Examples

specific Embodiment approach 1

[0035] Embodiment 1: This embodiment provides a multi-angle inclined drilling grouting process simulation test device for the coal seam floor under the action of pressurized dynamic water, such as figure 1 and figure 2 As shown, the shown device includes a test bench 1, a water source application device for a confined aquifer, a multi-angle drilling and crack simulation device with different apertures, and a grouting device, wherein:

[0036] The test bench 1 is a metal frame, which, as a bottom bearing body, can support multi-angle drilling and crack simulation devices with different apertures.

[0037] The multi-angle drilling and crack simulation device with different apertures can change the pipe diameter according to the experimental needs to simulate the needs of grouting in cracks of different sizes. combination structure. Each set of tubular members includes a plexiglass tube A for simulating cracks and a plexiglass tube B for simulating drilling, and the plexiglass...

specific Embodiment approach 2

[0046] Embodiment 2: In this embodiment, the method of using the device described in Embodiment 1 is described by taking the technological process of simultaneous grouting of three grouting holes with different angles as an example.

[0047] The first use requires the assembly of a test bench, a water source application device for a confined aquifer, a multi-angle drilling and crack simulation device with different apertures, and a grouting device. According to the need to determine the drilling angle, the device can simulate three different angles of grouting drilling at one time, such as 90°, 30° and 45°. Connect the experimental device and prepare for the experiment. During the connection process, pay attention to the tightness, and there should be no air leakage.

[0048] Aquifer simulation: open the grouting hole selection switches B1, C1, D1, B2, C2, D2, the closed fissure control valve D, and the open fissure control valve E, and close the non-disassembly flushing valv...

specific Embodiment approach 3

[0055] Embodiment 3: This embodiment is a further description of Embodiment 2, and the specific experimental process is as follows:

[0056] 1) Set the threshold value of the water pressure regulating valve F, such as 0.6MPa. Close the no-disassembly flush valve G. Open the open-source fissure control valve E, close the fissure control valve D, and close the non-disassembly flushing valve G. Open the grouting hole selection switches B1, C1, D1, B2, C2, D2; open the slurry flush valve A1 and the grouting channel valve A2. Start the constant pressure water pump 2 to inject water. When the slurry flushing valve A1 has water flowing out, close the grouting channel valve A2. Continue to inject water, the water pressure increases, until the water pressure regulating valve F overflows, close the open source fissure control valve E. When simulating a closed fracture, close the closed fracture control valve D directly.

[0057] 2) Preparation for grouting. Start the grouting mach...

technical field

[0001] The invention relates to a multi-hole multi-dip angle combined grouting process simulation experiment device based on the grouting hole arrangement process. Background technique

[0002] In the process of coal mining, the coal seam is seriously threatened by the confined water in the floor aquifer, and the water inrush coefficient is high. How to prevent the water inrush from the floor confined water is an important problem to ensure safe production of the working face. In particular, some aquifers with sufficient water sources but difficult to evacuate seriously affect mine production; the key to on-site implementation is often to choose floor grouting. At present, the theory of grouting diffusion radius is an empirical formula recognized by industry experts, and is widely used in mine grouting engineering. However, the grouting process and grouting mechanism of deeper multiple boreholes still need to be studied. For example, although the floor grou...

Examples

specific Embodiment approach 1

[0035] Embodiment 1: This embodiment provides a multi-angle inclined drilling grouting process simulation test device for the coal seam floor under the action of pressurized dynamic water, such as figure 1 and figure 2 As shown, the shown device includes a test bench 1, a water source application device for a confined aquifer, a multi-angle drilling and crack simulation device with different apertures, and a grouting device, wherein:

[0036] The test bench 1 is a metal frame, which, as a bottom bearing body, can support multi-angle drilling and crack simulation devices with different apertures.

[0037] The multi-angle drilling and crack simulation device with different apertures can change the pipe diameter according to the experimental needs to simulate the needs of grouting in cracks of different sizes. combination structure. Each set of tubular members includes a plexiglass tube A for simulating cracks and a plexiglass tube B for simulating drilling, and the plexiglass...

specific Embodiment approach 2

[0046] Embodiment 2: In this embodiment, the method of using the device described in Embodiment 1 is described by taking the technological process of simultaneous grouting of three grouting holes with different angles as an example.

[0047] The first use requires the assembly of a test bench, a water source application device for a confined aquifer, a multi-angle drilling and crack simulation device with different apertures, and a grouting device. According to the need to determine the drilling angle, the device can simulate three different angles of grouting drilling at one time, such as 90°, 30° and 45°. Connect the experimental device and prepare for the experiment. During the connection process, pay attention to the tightness, and there should be no air leakage.

[0048] Aquifer simulation: open the grouting hole selection switches B1, C1, D1, B2, C2, D2, the closed fissure control valve D, and the open fissure control valve E, and close the non-disassembly flushing valv...

specific Embodiment approach 3

[0055] Embodiment 3: This embodiment is a further description of Embodiment 2, and the specific experimental process is as follows:

[0056] 1) Set the threshold value of the water pressure regulating valve F, such as 0.6MPa. Close the no-disassembly flush valve G. Open the open-source fissure control valve E, close the fissure control valve D, and close the non-disassembly flushing valve G. Open the grouting hole selection switches B1, C1, D1, B2, C2, D2; open the slurry flush valve A1 and the grouting channel valve A2. Start the constant pressure water pump 2 to inject water. When the slurry flushing valve A1 has water flowing out, close the grouting channel valve A2. Continue to inject water, the water pressure increases, until the water pressure regulating valve F overflows, close the open source fissure control valve E. When simulating a closed fracture, close the closed fracture control valve D directly.

[0057] 2) Preparation for grouting. Start the grouting mach...

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