煤与瓦斯突出过程的力学作用机理  

Mechanical mechanism of coal and gas outburst process

作　　者：胡千庭[1,2] 周世宁[1] 周心权[1] 

机构地区：[1]中国矿业大学(北京)资源与安全工程学院,北京100083 [2]煤炭科学研究总院重庆研究院,重庆400037

出　　处：《煤炭学报》2008年第12期1368-1372,共5页Journal of China Coal Society

基　　金：国家重点基础研究发展计划(973)项目(2005CB221503);国家自然科学基金重点资助项目(50534080)

摘　　要：以"煤与瓦斯突出是一个力学破坏过程"的认识为前提,通过理论分析和数值模拟,对煤与瓦斯突出过程的力学作用机理进行了深入研究.对突出的准备、发动、发展和终止过程重新进行了划分,给出了各个过程详细的描述.在突出准备阶段,围岩发生应力集中和强度破坏,为后续的失稳创造了条件.突出的发动是围岩的突然失稳以及失稳煤岩的快速破坏和抛出.突出的发展是突出孔洞壁煤体由浅入深逐渐破坏并抛出的过程,主要受控于孔洞壁煤体的应力分布以及孔隙和裂隙中的瓦斯压力对煤的拉伸和剪切破坏,并可分为粉化和层裂2个阶段.突出孔壁受堆积煤岩的支撑或孔洞形状变化促使孔洞壁煤体受力状态的改变是突出终止的主因.＂Coal and gas outburst is a mechanical failure process＂, based on this standpoint, an in-depth study of the mechanical mechanism of coal and gas outburst process was performed through theoretic analysis and numerical simulation. The processes of the preparation, start, development and stop of outburst were divided again, and a detailed description for each process was given. In the preparation stage of outburst, stress concentration and failure occur in wall rock, this makes it possible for the subsequent destabilization. The start of outburst is a sudden destabilization of wall rock, and the subsequent breakage and throw of the instability coal and rock. The development of outburst is a process of coal breakage in cavity wall from superficial part to deep part, and this process is controlled by the stress distribution of cavity wall and the tensile failure of coal on account of gas pressure in pores and fractures, and it can be divided into two stages ： pulverizing stage and spalling stage. The support of cumulate coal and rock or the change of cavity shape promotes the stress state change, which is the leading cause of outburst stop.

关 键 词：煤与瓦斯突出 力学 机理 失稳 

分 类 号：TD713.1[矿业工程—矿井通风与安全]