Method for confirming stress distribution for Y-shaped ventilation gob stratum

A technology of stratum stress and goaf, applied in geophysical measurement, permeability/surface area analysis, suspension and porous material analysis, etc., can solve the problem of inability to accurately find gas-enriched areas and inaccurate layout of gas drainage boreholes , Mine gas disaster prevention and control issues such as large impact, to achieve the effect of high controllability, accurate positioning, and comprehensive improvement

Inactive Publication Date: 2014-05-21
CHONGQING UNIV
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Problems solved by technology

[0005] In the existing gobside retaining method of Y-shaped ventilation goaf roof pressure relief gas drainage method, the problem of how to determine the formation stress distribution of Y-shaped ventilation goaf has not been solved, resulting in the inability to accurately find Y-shaped ventilation goaf The gas enrichment area in the overlying strata of the area, so that the drilling holes for gas drainage cannot be arranged accurately, which leads to the inability to effectively extract gas, which has a great impact on the prevention and control of mine gas disasters

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  • Method for confirming stress distribution for Y-shaped ventilation gob stratum
  • Method for confirming stress distribution for Y-shaped ventilation gob stratum
  • Method for confirming stress distribution for Y-shaped ventilation gob stratum

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Embodiment Construction

[0028] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0029] Such as figure 1 As shown, a method for determining the formation stress distribution in a Y-shaped ventilated goaf includes the following steps:

[0030] Step 1. Carry out heat-fluid-solid coupling triaxial seepage test of gas-containing coal according to the working conditions on site, and obtain the permeability of the coal sample in the whole process of stress-strain.

[0031] Step 2, carry out K=ak through the obtained coal sample permeability 0 exp (-bσ) and K=ck 0 e dσ The fitting of a, b, c, d in middle, obtains the relation between coal seam permeability and stress state; Said K is the coal sample permeability, and described σ is the effective bulk stress of coal rock, and described ak 0 exp (-bσ)is the coal sample permeability before the peak point, the ck 0 e dσ is the coal sample permeability after the peak point, and the a, b, c, a...

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Abstract

The invention discloses a method for confirming stress distribution for Y-shaped ventilation gob stratum, and the method belongs to the gas extraction field, the method comprises the steps of doing the coal containing methane heat-fluid-solid coupling triaxial seepage test according to the working conditions on site to obtain the permeability of the coal sample during the stress-strain process, building the active volume stress intensity equation for coal, the coal stress balanced equation, geometric equation for coal containing methane and elastoplastic constitutive equation, importing the Comsol Multiphysics system and inputting the corresponding stratum material parameter to obtain the stress distribution result of the stratum through the iterative operation. The method can measure the stress distribution of the stratum for the Y-shaped ventilation gob more accurately, locate the enrichment region for Y-shaped ventilation gob more accurately and provide more specific guide for the drilling distribution during the gas extraction.

Description

technical field [0001] The invention belongs to the field of gas extraction, in particular to a method for determining the stratum stress distribution in a Y-shaped ventilated goaf. Background technique [0002] The source of gas in the mining space of a mine is mainly the gas gushing out of the working face and the goaf and the gas gushing in from the adjacent layers. The gas gushing out of the goaf accounts for about 40% of the gas gushing out of the mining space. In some mines, the gas gushing out of the goaf Gas accounts for 60% to 70% of the total gas emission in the mining space. Therefore, it is of great significance to study the laws of gas migration and enrichment in goafs for the prevention and control of mine gas disasters, the realization of gas drainage in goafs and the realization of coal and gas co-mining technologies. [0003] Before the ore body is mined, the rock mass is in a state of equilibrium. When the ore body is mined, an underground space is formed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V9/00G01N15/08
Inventor 尹光志李铭辉许江李文璞张东明黄滚王维忠蒋长宝韩佩博尚德磊宋真龙李星文莉军康向涛
Owner CHONGQING UNIV
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