柔性连接隧道在正断层黏滑错动下的变形特征

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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。

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关键词 ：隧道工程, 正断层, 黏滑错动, 柔性连接, 变形特征

Abstract：：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.

Key words： tunneling engineering normal fault stick-slip dislocation flexible joints deformation characteristics

收稿日期: 2012-06-19

引用本文:

刘学增1，林亮伦2，王煦霖3，李昕2. 柔性连接隧道在正断层黏滑错动下的变形特征[J]. 岩石力学与工程学报, 2013, 32(s2): 3545-3551.
LIU Xuezeng1，LIN Lianglun2，WANG Xulin3，LI Xin2. DEFORMATION CHARACTERISTICS OF TUNNEL WITH FLEXIBLE JOINTS AFFECTED BY NORMAL FAULT STICK-SLIP DISLOCATION. , 2013, 32(s2): 3545-3551.

链接本文:

https://rockmech.whrsm.ac.cn/CN/Y2013/V32/Is2/3545

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