Coal and gas outburst risk evaluation method

A gas-prominent and dangerous technology, applied in the field of mining engineering, can solve the problems of conservative conclusions, inaccurate judgments, energy dissipation, etc., to achieve the effect of accurate and non-prominent dangerous range, guaranteeing authenticity and objectivity

Active Publication Date: 2021-04-30
CHONGQING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the various mechanisms of coal and gas outburst, the contributions or obstacles of various factors to the outburst can be expressed in the form of energy. At present, it is generally believed that in the process of coal and gas outburst, all kinds of energy have already participated in the outburst, but in During the actual process of outburst, not all the energy is involved in coal and gas outburst, and the energy in the limit state has not been completely released, which leads to the conservative conclusions obtained by using the energy method to judge whether outburst will occur, and ultimately causes all Energy dissipation is not accurate enough for judging prominence

Method used

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  • Coal and gas outburst risk evaluation method
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  • Coal and gas outburst risk evaluation method

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Experimental program
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Embodiment 1

[0038] This embodiment provides a coal and gas outburst risk assessment method, including the following steps:

[0039] 1) According to the basic geological information of coal seam gas, the coal seam is divided into geological units.

[0040] 2) Determination of the original in-situ stress in each geological unit or the in-situ stress σ after the action of anti-outburst measures 0 , and take samples to measure the basic parameters of the coal body. Wherein, the basic parameters of the coal body include the modulus of elasticity E 0 , Poisson's ratio μ 0 , cohesion c 0 and internal friction angle

[0041] 3) Determine the volume of the energy release area in each geological unit. The basis for determining the energy release area figure 2 The coal roadway driving face model unfolded as shown. Such as image 3 As shown, the original plastic zone and the new plastic zone have the same radius. Before the mining face advances, the center of the plastic zone is O, and af...

Embodiment 2

[0065] The main steps of this embodiment are the same as those in Embodiment 1. see figure 2 , this embodiment is used for judging coal and gas outburst of the driving head and the coal mining face. In this embodiment, the elastic energy of the coal body in front of the driving head and the coal mining face is obtained according to the stress concentration factor in front of the coal body, and the elastic energy of the stress concentration part in front is obtained, and the ultimate elastic energy of the coal body is determined by the original ground stress. Before excavation or mining, the gas content in the stress concentration area is measured by the gas rapid measurement device, and the gas pressure is calculated by the Langmuir equation to finally calculate the gas expansion energy, and the limit gas expansion energy is determined by the gas content at the original in-situ stress. The crushing work is determined by taking the coal block body of the coal seam and taking ...

Embodiment 3

[0067] The main steps of this embodiment are the same as those in Embodiment 1. see image 3 , this embodiment is used to determine the outburst of the protected layer when the protected layer is exploited. In this embodiment, measure the elastic energy of the coal body in front of the in-situ stress near the protected boundary of the protected layer, and obtain the elastic energy of the front stress concentration part according to the stress concentration factor in front of the coal body, and determine the ultimate elastic energy of the coal body through the original in-situ stress. Before excavation, the gas content in the stress concentration area is measured by the gas rapid measurement device, and the gas pressure is calculated by the Langmuir equation to finally calculate the gas expansion energy, and the limit gas expansion energy is determined by the gas content at the original ground stress. The crushing work is determined by taking the coal block body of the coal se...

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Abstract

The invention provides a coal and gas outburst risk evaluation method. According to the method, the influence of the limit energy on the elastic energy, the gas expansion energy, the crushing energy and the throwing energy of the coal body is fully considered, whether the coal body subjected to various measures is subjected to outburst elimination or not is accurately estimated, and the pressure relief outburst elimination range after various measures are acted can be accurately determined; and compared with the prior art that whether coal and outburst happen or not is judged simply according to the gas content, the energy influences of various measures on various factors causing the outburst are fully analyzed and finally judged, and a basis is provided for accurate determination of the outburst prevention range of various measures. The authenticity and objectivity of various outburst prevention measures on outburst elimination of the outburst coal seam are basically guaranteed, an accurate outburst-risk-free range can be obtained, and a powerful guarantee is provided for safe mining of a coal mine.

Description

technical field [0001] The invention relates to the field of mine engineering, in particular to a coal and gas outburst risk assessment method. Background technique [0002] In the process of coal and gas outburst control, how to reduce the ground stress, increase the permeability, and improve the effect of gas drainage is the key to the prevention and control of coal and gas outburst. In the various mechanisms of coal and gas outburst, the contributions or obstacles of various factors to the outburst can be expressed in the form of energy. At present, it is generally believed that in the process of coal and gas outburst, all kinds of energy have already participated in the outburst, but in During the actual process of outburst, not all the energy is involved in coal and gas outburst, and the energy in the limit state has not been completely released, which leads to the conservative conclusions obtained by using the energy method to judge whether outburst will occur, and ult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/22
CPCG01N33/227
Inventor 梁运培邹全乐张碧川王智民陈建杰孔繁杰王军王志辉
Owner CHONGQING UNIV
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