摘要
将不同围岩结构岩溶隧道的水力破坏模式划分为:(1)非贯通盲端裂纹的扩展;(2)贯通裂纹的横向扩展;(3)隔离体岩块的失稳;(4)溶洞岩壁整体失稳。分析各种破坏模式的力学机制,采用断裂力学方法分析非贯通盲端裂纹及贯通裂纹的横向扩展条件,将非贯通盲端裂纹视为"无限大"体中的片状裂纹,用Green和Sneddon的求解结果计算裂纹起裂条件;将隧道–溶洞岩壁上裂隙视为岩板上贯通裂纹,按照复变函数推导出的Westergaard解计算裂纹起裂条件。采用基于赤平投影与实体比例投影的极限平衡法分析隔离体岩块的失稳机制,给出考虑水压力作用的极限平衡计算公式;采用强度折减法分析溶洞岩壁整体失稳的破坏特征。针对各破坏模式给出防治措施,研究结果可为类似工程提供参考依据。
According to surrounding rock structure,the hydraulic failure of karst tunnel is divided into the extension of non-transfixion cracks,the extension of transfixion cracks（grouted transfixion cracks）,the rock fall of isolated rock blocks and the collapse of rock wall between tunnel and karst cave.The hydraulic failure mechanisms of non-transfixion cracks and transfixion cracks（grouted transfixion cracks） are analyzed with fracture mechanics method,and the non-transfixion crack is treated as a sheet crack in infinite body.Its extension is calculated with Green and Sneddon′s solutions,and the transfixion crack is treated as a crack in plate,and its extension is calculated with function of complex variable of Westergaard.The hydraulic failure mechanism of isolated rock blocks is analyzed with stereographic projection and limit equilibrium method,and the calculation formula of limit equilibrium considering water pressure is presented.The hydraulic failure mechanism of rock wall between tunnel and karst cave is analyzed with strength reduction method,and an instance is presented with finite element method.Corresponding control measures are suggested for different failure modes,so as to provide reference to similar projects.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2010年第7期1363-1370,共8页
Chinese Journal of Rock Mechanics and Engineering
基金
上海市人才发展资金项目(2007)
上海市自然科学基金项目(10ZR1431500)
上海市重点学科(地质工程)(B308)
关键词
隧道工程
岩溶隧道
岩体结构
水力破坏模式
水力破坏机制
tunnelling engineering
karst tunnel
rock structure
hydraulic failure mode
hydraulic failure m echanism
