Coal seam mining-induced fracture field gas pressure measuring structure

Abstract

The invention provides a coal seam mining-induced fracture field gas pressure measuring structure. The structure comprises a drilling machine, a gas pipe, a grout prevention strip, a gas collection pipe, a grouting pipe, a gas pressure meter, a pressure sensor and a remote monitoring terminal. The drilling machine drills holes deep in a coal seam from a rock wall to form rock wall drilled holes and a coal drilled hole. The rock wall drilled holes comprise an outer wall drilled hole and an inner wall drilled hole, an orifice pipe is sleeved with the outer rock drilled hole, and a first grouting body is formed in an annular interlayer formed between the outer rock drilled hole and the orifice pipe; a second grouting body is formed in the orifice pipe and the inner rock drilled hole; the gas pipe deeply entering the coal seam is arranged in the center of the second grouting body in a sleeved mode, the grout stopping strip is arranged at the inner end of the gas pipe, and the gas collection pipe is disposed on the inner side wall of the gas pipe. Various drilled holes and multiple layers of grouting bodies are adopted, hole sealing is tight, and the functions of completely plugging cracks around rock, enhancing hole sealing quality and isolating gas in the holes are achieved. The structure is high in adaptability and can be adopted no matter how complex geological conditions are.

Description

technical field [0001] The invention belongs to the technical field of coal seam gas pressure detection, and in particular relates to a gas pressure measurement structure in a coal seam mining fissure field. Background technique [0002] Coal seam gas pressure is an important index to evaluate whether a coal seam has outburst risk, but the coal seam gas pressure is affected by different measurement methods and different geological conditions, and the real coal seam gas pressure is difficult to be effectively measured. When measuring coal seam gas pressure by drilling through layers, if the formation fractures are developed or the hole sealing technology is backward, it is easy to cause a large amount of gas overflow in the drilling hole in actual measurement, which is the main reason for the distortion of the pressure display. [0003] Coal seam gas pressure measurement can be divided into active pressure measurement method and passive pressure measurement method according t...

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Problems solved by technology

[0007] In order to solve the above technical problems, the present invention provides a gas pressure measurement structure for coal seam mining fissure field, which aims to solve the problems of gas overflow and inaccurate measurement information in the existing coal seam mining fissure field gas pressure measurement structure

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