Three-dimensional similarity test device and test method for mining of inclined coal seam with adjustable confined aquifer inclination angle

Abstract

The invention discloses a three-dimensional similarity test device and test method for mining of an inclined coal seam with an adjustable confined aquifer inclination angle, and relates to the field of confined water inclined coal seam mining similarity tests. The three-dimensional similarity test device comprises a test support, an internal frame, a model storage cavity, a loading plate, a horizontal loading system, a vertical loading system, a water pressure loading system, an inclination angle adjusting system, a signal acquisition and processing system, a three-dimensional test model and acoal seam mining simulation system. The test device realizes the adjustability of the inclination angle of the confined aquifer, the gradient distribution of the water pressure load of the aquifer and the authenticity of the stress state of the inclined coal seam in the vertical direction and the horizontal direction, and realizes the segmental and step-by-step excavation simulation of the coal seam in the closed space of the three-dimensional similar model; and the test device can truly invert generation, expansion and penetration of rock stratum fractures of the mining floor of the inclinedcoal seam on the confined water to finally form a dynamic evolution process of a water guide channel, and can better carry out prediction research on water inrush of the mining floor of the inclinedcoal seam with different inclination angles on the confined water in the strike of long-wall mining.

Description

technical field [0001] The invention relates to a simulation device for a similar test of coal seam mining, in particular to a three-dimensional similar test device and a test method for mining an inclined coal seam with an adjustable inclination angle of a confined aquifer. Background technique [0002] Floor water inrush is the main form of coal mine water damage in my country, especially in North China type coal fields, mine water damage caused by floor water inrush is common and prominent. With the increase of coal mine mining depth and mining intensity, the water pressure and ground pressure on the floor of the mining face are increasing, and the geological structure environment is becoming more and more complex, which makes the problem of water inrush on the floor more serious. Effectively curbing the occurrence of floor water damage has become a hot issue and technical problem faced by many mines in North China coalfields. [0003] The occurrence conditions of coal s...

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Problems solved by technology

However, in the prior art, the mining of coal seam is simulated by extracting a coal seam once or using steel plates and planks. These methods are only two-dimensional mining simulation methods, and at most they are considered to be step-by-step excavation of simulated coal seams. It is impossible to simulate the segmental excavation of coal seams, which is inconsistent with the mining process of coal seams in actual engineering

Similarly, Wang Hongwei et al. (Large-scale three-dimensional loadable similar simulation test for mining of large-dipping coal seams [J]. Journal of Coal Science, 2015, 40(7): 1505-1511) melted and discharged the cemented and easily soluble blocks packed in capsules by water injection. method, the similar simulation of coal seam excavation with large dip angle in three-dimensional confined space is realized, but the bearing capacity of the cemented soluble block packed in the capsule is small, which cannot be quantitatively controlled, let alone simulate the original stress state of the coal seam; at the same time, due to the simulation The capsules for coal seam excavation are long and run through the entire working face, and it is impossible to simulate the segmental excavation process of coal seams

[0006] To sum up, the existing two-dimensional and three-dimensional similar test devices and the method of simulating coal seam excavation cannot truly invert the generation, expansion, and penetration of floor cracks in the mining floor of inclined coal seams above confined water, and finally form the dynamics of water-conducting channels. evolutionary process

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