火成岩顶板对工作面冲击地压影响的理论分析  

Theoretical analysisy on influence of igneous rock roof on rockburst of working face

作　　者：李强[1] 王继仁[1] 韩昌良[2] LI Qiang;WANG Jiren;HAN Changliang(College of Mining Engineering,Liaoning Technical University,Fuxin,Liaoning 123000,China;School of Mines,China University of Mining & Technology,Xuzhou,Jiangsu 221116,China)

机构地区：[1]辽宁工程技术大学矿业学院,辽宁阜新123000 [2]中国矿业大学矿业工程学院,江苏徐州221116

出　　处：《采矿与安全工程学报》2019年第3期574-582,共9页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金青年科学基金项目(51404251);江苏省自然科学基金青年基金项目(BK20140198)

摘　　要：针对火成岩顶板诱发工作面冲击地压的问题,以新安煤矿八采区首采面为工程背景,采用顶板剪切梁模型,考虑煤层的塑性软化性质,分析了火成岩侵入对冲击地压的影响。结果表明:火成岩顶板厚度、剪切弹性模量和抗剪强度3个指标对诱发冲击地压具有重要影响。“煤层-火成岩顶板”变形系统既可能发生顶板断裂型冲击地压,也可能发生煤体压缩型冲击地压,计算得到了2种冲击地压的发生条件。定义了火成岩顶板过渡厚度、过渡剪切模量和过渡抗剪强度,分别给出了以这3项指标判定冲击地压是否发生及发生类型的判别方法。对于新安煤矿八采区首采面,火成岩顶板厚度小于过渡厚度,剪切弹性模量大于过渡剪切模量,抗剪强度大于过渡强度,所以该工作面火成岩顶板首先断裂,将发生顶板断裂型冲击地压。This paper aims to tackle the challenge of rock burst caused by igneous rock roof in coal mines. Based on the first longwall face of No.8 mining area at Xin’an Coal Mine, this research analyzed the impact of igneous rock intrusion on rockburst by using the roof shear beam model and considering the plasticity softening property of the coal seam. The results suggested that the roof thickness, shear modulus and shear strength have a critical impact on rockburst propensity. The deformation system of"the coal seam-igneous rock roof" may induce either the roof fracture type rockburst or the coal compression type rockburst, and the conditions for the occurrence of these two types rock bursts were proposed. The thickness, shear modulus and shear strength of a transitional layer, which is between the igneous rock roof and the coal seam, have been defined and used to form a new criterion to determine the rock burst occurrence and type of rock burst. For the first longwall face at the No.8 mining area, Xin’an Coal Mine, the rock roof thickness is less than the transition thickness, the shear modulus is larger than the transition modulus, and the shearing strength is greater than the transition strength. Therefore, the igneous rock roof first breaks, and the roof fracture type rockburst occurs.

关 键 词：火成岩侵入 冲击地压 顶板剪切梁模型 过渡厚度 过渡剪切模量 过渡强度 

分 类 号：TD324[矿业工程—矿井建设]