Failure modes of coal containing gas and mechanism of gas outbursts  

作　　者：HUANG Wei CHEN Zhanqing YUE Jianhua ZHANG Yu YANG Min 

机构地区：[1]State Key Laboratory of Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Xuzhou 221008, China [2]Department of Civil Engineering, Henan University of Urban Construction, Pingdingshan 467044, China [3]School of Mechanics & Civil Engineering, China University of Mining & Technology, Xuzhou 221116, China [4]School of Resource and Earth Science, China University of Mining & Technology, Xuzhou 221116, China

出　　处：《Mining Science and Technology》2010年第4期504-509,共6页矿业科学技术（英文版）

基　　金：financial support from the National Basic Research Program of China (No.2005CB221500);the National Natural Science Foundation of China (Nos.50534049,50674087 and 50974107);the Natural Science Foundation of Jiangsu Province (No.BK2007029)

摘　　要：In order to explain the mechanism for gas outburst, the process of evolving fractures in coal seams is described using system dynamics with variable boundaries. We discuss the failure modes of coal containing gas and then established the flow rules after failure. The condition under which states of deformation convert is presented and the manner in which these convert is proposed. In the end, the process of gas outbursts is explained in detail. It shows that a gas outburst is a process in which the boundaries of coal seams are variable because of coal failure. If the fractures are not connected or even closed owing to coal/rock stress, fractured zones will retain a certain level of carrying capacity because of the self-sealing gas pressure. When the accumulation of gas energy reaches its limit, coal seams will become unstable and gas outbursts take place.In order to explain the mechanism for gas outburst, the process of evolving fractures in coal seams is described using system dynamics with variable boundaries. We discuss the failure modes of coal containing gas and then established the flow rules after failure. The condition under which states of deformation convert is presented and the manner in which these convert is pro- posed. In the end, the process of gas outbursts is explained in detail. It shows that a gas outburst is a process in which the boundaries of coal seams are variable because of coal failure. If the fractures are not connected or even closed owing to coal/rock stress, fractured zones will retain a certain level of carrying capacity because of the self-sealing gas pressure. When the accumulation of gas energy reaches its limit, coal seams will become unstable and gas outbursts take place.

关 键 词：systems with variable boundaries gas outburst coal containing gas FAILURE flow rule 

分 类 号：TD263.31[矿业工程—矿井建设] TQ531.1[化学工程—煤化学工程]