柔性连接隧道在正断层黏滑错动下的变形特征  

DEFORMATION CHARACTERISTICS OF TUNNEL WITH FLEXIBLE JOINTS AFFECTED BY NORMAL FAULT STICK-SLIP DISLOCATION

作　　者：刘学增[1] 林亮伦[2] 王煦霖[3] 李昕[2] 

机构地区：[1]同济大学土木信息技术教育部工程研究中心,上海200092 [2]重庆市建筑科学研究院,重庆400015 [3]同济大学土木工程学院,上海200092

出　　处：《岩石力学与工程学报》2013年第S2期3545-3551,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(51278377);交通运输部科技项目(2011318775.680);重庆市自然科学基金计划(CSTC;2009BB6245)

摘　　要：针对穿越60°倾角活动正断层情况,隧道采取节段长度为0.5D(D为隧道洞径)、节段间柔性连接的隧道抗断措施;并对柔性连接隧道在正断层黏滑错动作用下的受力、变形特征进行模型试验研究。试验结果表明:在距离土体主破裂面1D范围内,柔性连接隧道衬砌结构的纵向、环向应变变化较大。柔性连接隧道的主要破坏形式为节段间转动和错台,隧道节段连接处发生2处转角为33°和28°的转动破坏,破坏范围为2.5D。在相同条件下,与未采取抗断设计的完整隧道相比:柔性连接隧道衬砌结构纵向应变要小于完整隧道应变,其破坏范围也小于完整隧道的破坏范围。Based on the project of the tunnel crossing the normal active fault whose dip angle is 60°,the length of segment is 0.5D(D is the diameter of tunnel) and flexible connection between two segments design is adopted in articulated tunnel. Through a model experiment,the deformation characteristics of tunnel with flexible joints are discussed. The experiment results show that the longitudinal strain and transverse strain of articulated tunnel change greatly in the range of 1D near the fracture plane. The tunnel failure mode is the combined rotation and slab staggering,the rotation angle is 33°and 28°,and the deformation range is 2.5D. Compared the tunnel where the anti-breaking measures are taken with the flexible tunnel,under the same experiment condition,the result indicats that the longitudinal strain of tunnel with flexible joints is smaller than the complete tunnel′s,and the deformation range of the flexible tunnel is smaller than that of the complete tunnel.

关 键 词：隧道工程 正断层 黏滑错动 柔性连接 变形特征 

分 类 号：U451[建筑科学—桥梁与隧道工程]