煤体压剪破裂震源模型及远场震动特征  

A coal shear fracture source model and its far-field seismic characteristics

作　　者：冯俊军[1] 王恩元[1] 沈荣喜[1] 陈亮[1] 李学龙[1] 李楠[2] 

机构地区：[1]中国矿业大学安全工程学院煤矿瓦斯与火灾教育部重点实验室,江苏徐州221116 [2]中国矿业大学煤炭资源与安全开采国家重点实验室,江苏徐州221116

出　　处：《中国矿业大学学报》2016年第3期483-489,共7页Journal of China University of Mining & Technology

基　　金：教育部科学技术研究项目(113031A);国家自然科学基金项目(51574231);中国矿业大学第七批优秀创新团队项目(2014ZY001)

摘　　要：为了研究工作面煤体破裂造成的震动破坏效应,根据位错震源理论与动态断裂力学,建立了煤体压剪破裂震源模型,推导了煤体压剪破裂引起的震动位移场远场表达式.数值计算结果表明:随着煤体破裂速度的升高,远场P波、SH波和SV波的振幅逐渐增大.震动位移场远场空间分布特征显示P波分量主要集中在与破裂面成45°夹角的平面内,SH波和SV波分量主要集中在破裂面及其正交面内.在平行和垂直于破裂面的传播方向上,P波的衰减速度大于SH波和SV波且幅值小于SH波和SV波.工程实践中,需要注意防范P波对工作面巷帮造成层裂破坏和SH波、SV波对工作面两巷与顶底板结合处造成剪切破坏.In order to study the vibration damage caused by coal fracture in mining face, based on the dislocation source theory and dynamic fracture mechanics, a source model of coal shear fracture and the analytical expression of far-field seismic displacement caused by coal shear frac- ture were presented. The results show that the amplitudes of P-wave, SH-wave and SV-wave get larger with the increase of coal fracture velocity. The spatial distribution of far-field seismic displacement demonstrates that P-wave is mainly concentrated on the two planes inclined at 45° to the crack plane, whereas SH-wave and SV-wave are mostly concentrated on the crack plane and its orthogonal plane. On both of the horizontal and vertical direction of the crack plane, the decay speed of P-wave is larger than that of SH-wave and SV-wave, and the magnitude of P- wave is smaller than that of SH-wave and SV-wave. The spallation caused by P-wave on road- way surface deserves significant attention in field application, as well as the collapse induced by SH-wave and SV-wave on the junctions between roadway and both roof and floor.

关 键 词：位错震源理论 破裂面滑移 震源函数 震动位移场 破裂速度 

分 类 号：TD324[矿业工程—矿井建设]