Simulation test device of pressure-bearing underwater coal mining and application method of simulation test device

Abstract

The invention discloses a simulation test device of pressure-bearing underwater coal mining. The simulation test device comprises a frame body, a pressure-bearing water-containing layer (41) arranged on the frame body, a coal layer (42), supporting rods arranged on the two sides of the coal layer (42), and other rock layers, wherein the pressure-bearing water-containing layer is formed by connecting a plurality of small water bags; and each small water bag is of a cubic structure enclosed by a water bag top plate (1), a water bag bottom plate (2), a front side wall (3), a rear side wall (4), a left side wall (5) and a right side wall (6) and the inner part of each small water bag is a water filling space. With the adoption of the simulation test device of the pressure-bearing underwater coal mining, provided by the invention, the simulation degree of an analog simulation experiment is improved, experiment data is scientific and reliable, and pressure-bearing automatic underwater coal mining and pressure monitoring can be realized.

Description

technical field [0001] The invention relates to the fields of mining machinery and education, in particular to a simulation test device for mining coal under pressure and a method for using the same. Background technique [0002] Confined aquifers widely exist in my country's coal-measure strata, and there have been many accidents at home and abroad caused by coal mining face pressure frames under confined aquifers, resulting in a large number of casualties and huge economic losses. Therefore, under the combined effects of mining, mine pressure, and confined water, it is particularly important to understand the load transfer of confined water, the mechanism of mine pressure under the combined action of water and rock, and the pressure frame of the working face to cause disasters. [0003] In view of the above problems, at present, theoretical analysis is mainly used to demonstrate the reliability of mining parameters in combination with similar simulation experiments, but si...

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Problems solved by technology

[0004] First of all, the excavation process is manual excavation with thin iron rods. Generally, a certain distance of coal seam (such as about 50mm) is excavated every two hours. Similarity ratio, which means that the coal is pushed forward 5m at a time, which is unscientific), that is, it is excavated at a certain speed, and generally a model needs more than three days and three nights of continuous excavation, which requires the experimenters At night, it needs to be excavated every two hours. An experiment generally requires 3-5 excavators. The workload is very heavy and it is very inconvenient.

[0005] Second, when excavating, because the similar model device is generally 300mm wide, the model in the middle part is relatively hard and cannot be seen clearly, and often digs the wrong roof or bottom plate, etc., which has a great impact on the results of the experiment

[0006] Third, sometimes the model is relatively hard, and it takes a lot of force to dig it out. In the middle part of the model, it even needs to be tapped to move it. This kind of vibration, knocking or unconscious contact with the top plate is equivalent to The impact of large rock burst, so it has a great influence on the results of some experiments on the roof structure

[0010] (1) In the above method, an integral, full-length pressurized water bag is used to approximate the confined aquifer in the coal-measure strata. However, as a material of the water bag itself, it has certain strength and curvature. The full length of the water bag is used (for example, a 3m long test frame uses a 3m long water bag), because the water pressure of the pressurized water that needs to be simulated is generally high, the designed water bag must be able to withstand a certain water pressure, so that the water The strength of the bag itself should not be too low, and its curvature will naturally become smaller. In addition, the two ends of the water bag moving and deforming in the overlying rock will be compressed by the rock layer, and the moving and deforming area of ​​the overlying rock is large, which will cause water bags After the coal seam is mined, it cannot sink synchronously with the movement of the rock layer, resulting in the separation of the rock layer and the water bag, and the load of the confined aquifer cannot be transmitted downward, resulting in test distortion or even failure.

[0011] (2) In the above experimental methods, it is also impossible to simulate and monitor the flow and recharge of water in the part of the aquifer affected by mining during the mining process of the coal seam, and it is also impossible to estimate the advancing distance of the coal mining face. , propulsion speed and other factors and the change of the supply direction of the internal water flow in the confined water, and make qualitative and quantitative judgments, it is naturally impossible to draw a regular understanding

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