高烈度区软硬岩交界段隧道震害机制及减震缝减震技术模型试验研究

doi:10.13722/j.cnki.jrme.2017.0324

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摘要

为探讨高烈度区软硬岩交界段隧道震害机制和减震缝减震技术，依托某隧道工程开展大型三方向六自由度强震振动模型试验。通过对试验数据的分析，研究了硬岩、软岩、软硬岩交界不同地质条件下，不设置减震缝、仅二衬设置减震缝、初支与二衬交错设置减震缝5种工况隧道衬砌结构所受地层惯性力、位移差、主拉应力、内力和安全系数。结果表明：强震作用下软硬岩交界处位移差显著，地层惯性力对软岩段影响明显强于硬岩段；二衬减震缝的设置能有效降低软硬岩交界段衬砌结构主拉应力47%以上、降低结构内力40%以上，交错设缝措施较仅二衬设缝措施减震率最大提高近20%；隧道穿越高烈度区软硬岩交界段推荐采用“交错设缝”抗减震结构型式，即二衬减震缝结合衬砌台车长度设置，初支减震缝按3 m间隔设置。研究结论对于高烈度艰险山区交通生命线的抗减震技术具有重要的意义。

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关键词 ：隧道工程, 高烈度地震区, 软硬岩交界段, 震害机制, 抗减震措施, 模型试验

Abstract：

In order to study damage mechanism and shock absorption joint damping technology of tunel passing through an interface of soft and hard rock in highly seismic area，the strong earthquake vibration dynamic test was carried out based on a tunnel. By analyzing formation inertia force，differential displacement，principal tensile stress，internal force and safety factor，five kinds of working conditions were comparative studied，mainly including condition A(no damping measures in hard rock)，B(no damping measures in soft rock)，C(no damping measures in junction of soft and hard rock)，D(absorbing joint only secondary lining in junction of soft and hard rock)，E(combination shock absorption measures in junction of soft and hard rock). The result show that displacement difference is significant under strong earthquake crossing interface of soft and hard rock，and the formation inertia force of soft rock is stronger than that of hard rock. The damping rate of principal stress or internal force is beyond 47% and 40% by setting shock absorbing joint only secondary lining. And the rate of maximum damping with staggered joint is increased by about 20% comparing with absorbing joint only secondary lining. The shock absorption structure of staggered joint is recommended to be used in the tunnel crossing interface of soft and hard rock in high intensity zone，namely absorbing joint in secondary lining is combined with the length of lining trolley and the shock absorption gap of initial support is set by 3 m interval. The research results have important significance to anti shock technology for traffic lifeline crossing interface of soft and hard rock in highly seismic area.

Key words： tunnelling engineering highly seismic area interface between soft and hard rock damage mechanism aseismic and absorption measures model test

引用本文:

王道远1，2，3，袁金秀2，朱永全1，3，崔光耀4，朱正国1，李冬2，王洪凡2. 高烈度区软硬岩交界段隧道震害机制及减震缝减震技术模型试验研究[J]. 岩石力学与工程学报, 2017, 36(S2): 4113-4121.
WANG Daoyuan1，2，3，YUAN Jinxiu2，ZHU Yongquan1，3，CUI Guangyao4，ZHU Zhengguo1，LI Dong2，. Mechanism of seismic damage and mode test on absorption joint damping technology of tunnel across junction of soft and hard rock in highly seismic area. , 2017, 36(S2): 4113-4121.

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https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2017.0324 或 https://rockmech.whrsm.ac.cn/CN/Y2017/V36/IS2/4113

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