CN207351871U - A kind of grouting for water plugging simulation test device - Google Patents

Abstract

The utility model discloses a simulation test device for grouting plugging, which comprises a test box, a grouting machine, a grouting pipe, a stress loading system, a methane gas cylinder, and a measuring cylinder. The strength of coal and rock mass is rebonded into a unified whole, and a large number of cracks in the coal body are blocked, which is the most effective technical means to control underground geological disasters. The utility model is simple and convenient to operate, and can simulate the actual plugging effect of grouting under the condition that the coal seam is stressed under laboratory conditions.

Description

A simulation test device for grouting plugging

technical field

The utility model relates to the technical field of coal mine grouting, in particular to an experimental device for simulating coal seam grouting plugging.

technical background

With the increase of coal mining depth in our country, the in-situ stress on the coal seam gradually increases, which leads to the softness of the coal in the deep coal seam, and the development of a large number of pores and fissures in the coal body, resulting in a decrease in the bearing capacity of the coal body, making it difficult to withstand high stress impacts and gas in the coal seam The impact of pressure can easily lead to coal and gas outburst accidents; at the same time, air leakage from cracks in the coal body can also lead to spontaneous combustion of the coal body, which brings serious hidden dangers to underground safety production. The method of grouting reinforcement can re-bond the strength of the broken coal and rock mass into a unified whole, and seal a large number of cracks in the coal body. It is the most effective technical means to control underground geological disasters. At present, there are few experimental devices for grouting plugging, and it is impossible to simulate the situation of real coal seam grouting plugging under laboratory conditions, and it is difficult to make a reasonable evaluation of the plugging effect of different plugging materials.

Utility model content

The purpose of the utility model is to provide a simulation experiment device for grouting plugging. The device is simple in structure and easy to operate, and can overcome the deficiencies in the above technical background. It can carry out grouting plugging experiments under laboratory conditions to simulate grouting in underground coal seams. According to the situation, the plugging effect of different grouting plugging materials is evaluated.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical scheme: a kind of grouting plugging simulation experiment device, including test box, grouting machine, grouting pipe, stress loading system, methane gas cylinder, measuring cylinder; The grouting pipe is connected to the grouting machine through the rubber pipe, the air inlet of the test chamber is connected to the methane cylinder through the air pipe, the air outlet of the test chamber is connected to the measuring cylinder through the air pipe, and the stress loading system is composed of multiple hydraulic cylinders, which can control the The top plate applies the load. Through the above technical solutions, the plugging effect of coal seam grouting under real stress conditions can be simulated under laboratory conditions, and the sealing of different plugging materials can be evaluated by comparing the change of coal powder permeability k in the test box before and after grouting plugging blocking effect.

By adopting the above technical scheme, the present invention has the following beneficial effects: (1) The device is easy to operate and can simulate and study the grouting process under laboratory conditions; (2) The stress loading system can simulate the grouting process of the coal seam under stress. (3) The plugging effect of the plugging material can be reasonably evaluated by calculating the change of the coal powder permeability before and after the grouting plugging.

Description of drawings

Fig. 1 Schematic diagram of the structure of the simulation experiment device for grouting plugging.

Figure 2 Front view of the test box.

Figure 3 Top view of the test box.

Fig. 4 Schematic diagram of the structure of the shroud 7 and the shroud 8.

Detailed ways

In order to realize the technical features and effects of the present utility model, refer to Fig. 1 to Fig. 4, and further describe the operation method of the present utility model in detail in combination with specific implementation contents.

A kind of grouting plugging simulation experimental device described in the utility model is realized by adopting the following technical scheme: a kind of grouting plugging simulation experimental device includes test box 1, stress loading system 31, grouting pipe 2, grouting Valve 10, rubber hose 11, grouting machine 12, air inlet valve 20, air pipe 21, air inlet pressure gauge 22, pressure reducing valve 23, gas cylinder 24, air outlet valve 40, air pipe 42, air outlet valve 41, measuring cylinder 43; Test chamber 1 is composed of top plate 3, bottom plate 4, coaming plate 5, coaming plate 6, coaming plate 7 and coaming plate 8, coaming plate 5 and coaming plate 6 are respectively fixed with four same screw rods 9, coaming plate 7 and coaming plate A chute is provided on the upper part of the coaming plate 8, so that the top plate 3 can move up and down, and the coaming plate 7 is provided with a grouting hole 71, an air outlet 72, and the coaming plate 8 is provided with an air inlet 81; Grouting pipe 2, the grouting pipe 2 is connected with the grouting machine 12 through the rubber pipe 11, the rubber pipe 11 is provided with the grouting valve 10; An air inlet valve 20, an inlet pressure gauge 22 and a pressure reducing valve 23 are respectively provided; the air outlet 72 on the coaming plate 7 is connected with the measuring cylinder 43 through the air pipe 42, and the air pipe 21 is provided with an air outlet valve 40 and an air outlet pressure gauge 41 A stress loading system 31 is provided on the test box 1, and the stress loading system is composed of a plurality of hydraulic cylinders, which can apply a uniform load to the top plate 3 of the test box 1.

Further, the test box is a cuboid rigid mold of 1m×0.5m×0.5m (length×width×height), which is composed of a top plate, a bottom plate, and a coaming. Sample out the mold.

Furthermore, the grouting pipe is a 1m PVC pipe with a hole diameter of 20mm, and several eyelets with a hole diameter of 8mm are processed at the front end of the grouting pipe to ensure that the plugging material slurry can flow out of the eyelets and spread evenly into the surrounding coal seams.

Further, the formula for calculating the permeability k of pulverized coal in the test chamber is:

In the formula, k is the permeability of pulverized coal in the test chamber, in mD; μ is the gas viscosity, in 10 ^-6 mPa·s; L is the length of the test chamber, in cm; p ₀ is the atmospheric pressure, in MPa; Q ₀ is the gas flow rate, in cm³/s; A is the side area of the test chamber, in cm²; p ₁ and p ₂ are the inlet and outlet pressures, in MPa.

Concrete hole sealing operation steps of the present utility model are:

Step 1, first assemble the test box 1, fix the bottom plate 4 and the surrounding plates through the screw 9, and the top plate 3 can move up and down; then lay coal powder in the test box and tamp it layer by layer to simulate the real coal seam effect , and pre-embed the grouting pipe 2 in the pulverized coal; use the stress loading system 31 to load the top plate 3 of the test chamber 1 to simulate the stress effect state of the real coal seam. Open the inlet valve 20 and the gas outlet valve 40, use the methane gas cylinder 24 to inject gas into the test chamber 1, and adjust the inlet pressure by adjusting the pressure reducing valve 23, and calculate the gas flow rate according to the change of the liquid level in the measuring cylinder 43 , and calculate the coal powder permeability in the test chamber before grouting plugging.

Step 2, before the grouting work, first close the air inlet valve 20 and the air outlet valve 40, connect the grouting pipe 2 with the grouting machine 11 through the rubber hose 11, open the grouting valve 10, and use the grouting machine 12 to put the pre-prepared The plugging material slurry is injected into the pulverized coal in the test chamber 1, and the pulverized coal is grouted and blocked; after the grouting work is completed, the grouting valve 10 is closed, and the test chamber 1 is stored at room temperature until the plugging The material is fully cured.

Step 3, after the slurry in the coal seam is completely solidified, open the test chamber inlet valve 20 and the gas outlet valve 40, use the methane gas cylinder 24 to inject gas into the test chamber 1, and control the inlet pressure by adjusting the pressure reducing valve 23 , calculate the gas flow rate according to the change of the liquid level in the measuring cylinder 43, and calculate the coal powder permeability in the test chamber after the grouting plugging.

Step 4, evaluate the actual plugging effect of different plugging materials by comparing the change of coal powder permeability in the test chamber before and after grouting plugging.

The above descriptions are only preferred feasible embodiments of the present utility model, and are not intended to limit the patent protection scope of the present utility model. In addition to the above embodiments, the utility model can also have other implementations. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the utility model. The undescribed technical features of the utility model can be realized by or adopting the prior art, and will not be repeated here.

Claims (3)

1. A kind of 1. grouting for water plugging simulation test device, it is characterised in that：Including chamber, grouter, Grouting Pipe, stress loading system System, methane gas cylinder, graduated cylinder；Grouting Pipe is equipped with the chamber, Grouting Pipe is connected by sebific duct with grouter, the chamber Air inlet is connected by tracheae with methane gas cylinder, and the chamber gas outlet is connected by tracheae with graduated cylinder, stress loading system It is made of multiple hydraulic cylinders.
2. 2. grouting for water plugging simulation test device according to claim 1, it is characterised in that：Chamber by top plate, bottom plate and Surrounding coaming plate is formed, and two gusset plate of chamber is equipped with sliding slot, tests the upper and lower fixation of roof box and upper plate can move up and down, Surrounding coaming plate and bottom plate are detachable, facilitate coal sample depanning, and experiment roof box can be applied in load by stress loading system, The real stress in coal seam can be simulated.
3. 3. grouting for water plugging simulation test device according to claim 1, it is characterised in that：Chamber air inlet passes through tracheae It is connected with methane gas cylinder, chamber gas outlet is connected by tracheae with graduated cylinder, is carried out gas injection to chamber using methane gas cylinder, is led to Decompression valve regulation inlet pressure is overregulated, gas flow can obtain according to liquid level change in graduated cylinder, thus can calculate The permeability of coal dust in chamber.