摘要
采用非连续离散元软件UDEC,对应力波扰动诱发冲击矿压形成发生全过程、巷道埋深H及扰动应力强度Pmax对围岩稳定性的影响进行了有效的数值模拟,得到了巷道围岩在应力波扰动过程中响应速率、响应变形及岩体破损范围大小,以及发生冲击矿压的临界深度和临界扰动应力强度值.结果表明:扰动应力波是引起围岩裂隙延伸贯通,继而诱发冲击矿压的重要因素;围岩埋深条件及扰动应力波的强度决定了巷道围岩裂隙发展影响区域及形态,并最终影响到冲击地压发生与否.研究结果对揭示煤矿冲击矿压的诱发机理具有重要意义.
The whole process of the rockburst induced by the disturbing stress wave and the effect of the roadway depth H and the disturbing stress wave intensity Pmax on the stability of the surrounding rock is simulated by using the software UDEC. The response rate, response deformation, the damage range of surrounding rock under the disturbance together with the critical depth where rock burst takes place and the critical disturbing stress are acquired. The result shows that the stress wave disturbance is an important factor making fractures extend and penetrate through and further induce the rockburst; the roadway depth and the disturbing stress determines the range and characters of fracture extension in surrounding rocks and at last determines whether the rockburst will take place or not. This result is very significant in studying the inducing mechanism of rockburst.
出处
《采矿与安全工程学报》
EI
北大核心
2008年第2期127-131,共5页
Journal of Mining & Safety Engineering
基金
国家自然科学基金重大项目(50490273)
国家重点基础研究发展计划(973)项目(2005CB221502)
关键词
冲击矿压
应力波
数值模拟
rock burst
stress wave
numerical simulation
