地震动作用下浅埋隧道非对称塌落机制研究

doi:10.13722/j.cnki.jrme.2021.0378

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摘要基于岩体Hoek-Brown破坏准则，结合极限分析法的上限定理和待定边界变分法，提出浅埋隧道上覆岩体在地震动作用下非对称塌落曲线的解析解，同时开展地震体波和岩体参数对非对称塌落曲线影响研究。结果显示：在不考虑岩体损伤的情况下，S波会使岩块的几何形状发生倾斜，并有利于抑制岩块的塌落且在力学性能较好的岩体上抑制作用更显著；而P波在传播方向与重力方向一致时会促进岩块塌落，且使塌落岩块的几何面积变小。表明在地震动作用下，更小范围的机动许可速度场就能导致岩体达到极限破坏状态。研究成果对隧道工程的安全设计和施工具有一定的指导意义。

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	梁嘉韵1
	2
	崔杰1
	2
	李亚东1
	2
	单毅1
	2
	MARCO Donà1
	3

关键词 ：隧道工程, 地震动作用, 浅埋隧道, 非对称塌落, Hoek-Brown破坏准则, 上限分析, 待定边界变分法

Abstract：The aim of this paper is to study the asymmetric collapse mechanism of the overlying rock mass of shallow tunnel under seismic load. Based on the Hoek-Brown failure criterion，combined with the upper bound theorem of the limit analysis and the variational method of the variable endpoints problem，the analytical solution of the asymmetric collapse curve is proposed. The effects of seismic body wave and rock parameters on the asymmetric collapse curve are analyzed. It can be found that，without considering the damage of rock mass，the S-wave will tilt the geometric shape of collapsing block，which is beneficial to restrain the collapse. And the restrain effect is more significant in the rock mass with better mechanical properties. The backward propagation of P-wave will promote the collapse of the rock block and make the geometrical area of the collapsing block smaller. This implies that under seismic load，a smaller range of allowable velocity field can lead to the ultimate failure state of rock mass. The conclusion of this paper will help to provide a safer design and construction guidance for engineering practice.

Key words： tunnelling engineering seismic load shallow tunnel asymmetric collapse mechanism Hoek-Brown failure criterion upper bound theorem variable endpoints problem in the calculus of variations

引用本文:

梁嘉韵1，2，崔杰1，2，李亚东1，2，单毅1，2，MARCO Donà1，3. 地震动作用下浅埋隧道非对称塌落机制研究[J]. 岩石力学与工程学报, 2022, 41(S1): 2772-2779.
LIANG Jiayun1，2，CUI Jie1，2，LI Yadong1，2，SHAN Yi1，2，MARCO Donà1，3. Upper bound analysis of asymmetric collapse mechanism of shallow tunnel under seismic load. , 2022, 41(S1): 2772-2779.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0378 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/IS1/2772

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