Gas migration of coal in front of a mining face considering crack evolution

被引：7

作者：

Cao, S. G. ^{[1
]}

Luo, F. ^{[2
,3
]}

Liu, Y. B. ^{[4
]}

Li, Y. ^{[1
]}

Guo, P. ^{[4
]}

Li, G. D. ^{[1
]}

机构：

[1] Chongqing Univ, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China

[2] Hebei Univ Engn, Coll Resources, Handan 056038, Peoples R China

[3] Hebei Univ Engn, Key Lab Resource Explorat Res Hebei Prov, Handan 056038, Peoples R China

[4] Chongqing Res Inst Co Ltd, China Coal Technol & Engn Grp, Chongqing 400037, Peoples R China

来源：

ENVIRONMENTAL EARTH SCIENCES | 2016年 / 75卷 / 18期

基金：

中国国家自然科学基金;

关键词：

Gassy coal; Crack evolution; Solid-gas coupling; Gas migration; PERMEABILITY; SORPTION; FLOW;

D O I：

10.1007/s12665-016-6068-5

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The analysis of gradual mechanical responses of coal and gas migration within the coal in front of a mining face is crucial to coal and gas outburst prevention and control. In the present paper, the stress distribution of an entire stope is numerically studied by FLAC 3D. The stress state and its development within coal in front of a mining face are analyzed, and a simplified physics model is developed based on the simulation results. The crack expansion process of a coal specimen under a quasi-plane strain condition is studied using a coal solid-gas coupled meso-mechanics system that is imported into COMSOL for simulating the gas migration of coal in front of a mining face. A self-established solid-gas coupling constitutive model, which considers the gas pressure and gas adsorption, is used. The gas pressure gradient and speed of gas migration reach maximum values near the free sidewall, which is in agreement with the field test results.

引用

页数：11

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