采矿与安全工程学报2011，Vol.28Issue(3)：350-355,6.
采动煤岩不同破裂模式下的能量辐射与应力降特征
Characteristics of Energy Radiation and Stress Drop in Different Failure Modes of Mining-Induced Coal-Rock Mass
摘要
Abstract
In this paper, we theoretically analyze characteristics of stress drop, the strain energy release, and seismic radiation pattern associated with the rock tensile fracture and shear failure to reveal the corresponding burst risk ranks of coal-rock mass in various failure modes. The results show that the stress required to fail the rock and the associated energy released by rock failure are different, mainly depending on the fracture mode within the rock mass. In case of the same physical and mechanical properties, the energy released increases with the increase of fracture radius. Given the same fracture radius, the stress drop and energy released associated with shear failure are significantly greater than that of tensile fracture. In addition, in case of the same energy released, the fracture radius decreases with the increase of uniaxial compres-sive strength of the rock mass. Meanwhile,the seismic displacements and energy radiation patterns of different mining-induced tremors vary with different components of the moment tensors. The seismic waveforms of tensile fractures are always characterized by clear P-wave arrivals and the ratio of S- to P-wave energy or amplitude is relatively small, while the shear failures always present weak P-wave arrivals and the ratio of S- to P-wave energy or amplitude is much greater.关键词
应力降/能量释放/剪切破裂/拉伸破裂/破裂半径/震源矩张量Key words
stress drop/ energy released/ shear failure/ tensile fracture/ fracture radius/ moment tensor分类
矿业与冶金引用本文复制引用
曹安业,窦林名,江衡,吕长国,郭晓强,王毅..采动煤岩不同破裂模式下的能量辐射与应力降特征[J].采矿与安全工程学报,2011,28(3):350-355,6.基金项目
国家自然科学基金项目(50490273,50474068) （50490273,50474068）
国家重点基础研究发展计划(973)项目(2010CB226805) （973）
中央高校基本科研业务专项资金项目(2010QNA30) （2010QNA30）
煤炭资源与安全开采国家重点实验室自主研究项目(SKLCRSM10X05) （SKLCRSM10X05）
江苏高校优势学科建设工程项目. （）
