基于梁柱稳定理论的深埋隧洞岩爆破坏及孕育机理研究  

Rock Burst Damage and Generation Mechanism in Deep Tunnel Based on Beam-column Stability Theory

作　　者：肖建清[1,2] 杨玉东[1] 冯夏庭[2] 

机构地区：[1]安阳师范学院建筑工程学院,河南安阳455000 [2]中国科学院武汉岩土力学研究所、岩土力学与工程国家重点实验室,武汉430071

出　　处：《防灾减灾工程学报》2014年第2期203-210,共8页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家重点基础研究发展规划(973)项目(2010CB732006);国家青年自然科学基金项目(11002067);河南省高等学校青年骨干教师资助计划项目(2011GGJS-144)资助

摘　　要：深埋隧洞中岩爆轴向位置的确定以及破坏机理的研究是岩爆灾害预测和防治的理论基础。根据深埋长大隧洞围岩的结构、受力以及变形特点,建立了梁柱力学模型。在弹性范围内,运用力法,求解了该一次超静定梁柱的挠曲线方程和转角方程,得出了临界力的解析表达式。以锦屏II级水电站的松动圈实测数据为依据,给出了梁柱模型截面尺寸的确定方法,计算了围岩各部位存在稳定性问题的临界长度值以及达到临界稳定状态的特征长度值。最后,给出了深埋隧洞坑状岩爆的演化模型,分析了掌子面推进过程中,开挖卸荷、动力扰动等对于裂纹的萌生和扩展、围岩结构的形态和稳定性以及岩爆破坏模式的影响。The study of rock burst position and failure mechanism along the axial direction can provide basic information for the prediction and precaution of rock burst in deep tunnel.The beam-column mechanical model was established based on structure,stress and deformation features of the surrounding rock in deep tunnel.By using the elastic theory and force method,the deflection and slope equations for the first order statically indeterminate beam-column were derived,and the analytical expression for critical force calculation was presented.On the basis of the measured data of the excavation disturbed zone（EDZ）in the tunnel of JinPing II hydropower station,the method for section size determination in beam-column model was provided.The critical lengths,beyond which the stability issue must be taken into account,and the characteristic lengths,at which the critical state of stability is reached,for the surrounding rock were calculated.Finally,a conceptual model representing the evolution process of rock burst in deep tunnel was put forward.And the influences of excavation and dynamic disturbance on the initiation and propagation of internal cracks,structure form of surrounding rock and failure mode of rock burst during construction were discussed.

关 键 词：深埋隧洞 岩爆机理 稳定理论 梁柱模型 

分 类 号：TV554[水利工程—水利水电工程]