围岩–衬砌接触力学特性对地下工程地震动力响应的影响研究

doi:10.13722/j.cnki.jrme.2019.0088

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摘要鉴于鲜有关于围岩–衬砌接触面对地下工程动力响应影响的相关研究，基于数值计算方法，在与已有试验结果对比验证计算方法可靠性的基础上，通过建立是否考虑围岩–衬砌间接触关系两种不同形式的模型，研究地震作用下围岩–衬砌接触面对地下工程动力响应的影响规律，并深入分析接触面力学特性对地下工程中衬砌结构动力响应的影响规律。研究结果显示：围岩–衬砌间接触面对围岩位移响应具有显著的影响，尤其是两侧拱肩处的围岩，在地震作用下更容易破坏。在水平方向上，顶拱范围的围岩以受拉为主，其他大部分围岩则以受压为主，在垂直方向上，洞室两侧围岩以受拉为主，其他大部分则以受压为主；围岩–衬砌间的接触面会破坏围岩–衬砌体系的完整性及连续性，从而入射波在通过接触面后产生的反射及折射叠加后，加剧衬砌的位移响应程度，尤其是仰拱及两侧边墙范围内。衬砌的内力响应整体上有减小的趋势，但存在一定的区域效应，其中拱顶、拱底及两侧拱腰处的剪力均比未考虑围岩–衬砌间接触关系时大；围岩–衬砌间接触面的各个力学参数对洞室衬砌的动力响应的影响规律不尽相同。其中，接触面刚度对衬砌内力的响应程度的影响起主导作用，而接触面摩擦因数、黏聚力及抗拉强度的大小对衬砌轴力及弯矩的影响较小，并且黏聚力和抗拉强度对衬砌内轴力及弯矩响应程度的影响沿着洞室中心线呈“反对称”现象，衬砌内轴力及弯矩的响应程度与抗拉强度是非线性相关。研究结果体现了考虑围岩–衬砌间接触关系的必要性。

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	梅贤丞1
	2
	崔臻1
	2
	盛谦1
	2
	陈柳洁3
	周兴涛1
	2
	张亚超4

关键词 ：隧道工程, 围岩, 衬砌, 接触面, 动力响应, 影响因素

Abstract：Because of the little research on the influence of rock-lining interface on the dynamic response of underground engineering，the author established two different forms of models in consideration of rock-concrete interaction which is simulated by the interface zone. The comparison with existing test results is conducted to verify the reliability of the calculation method. The influence law of rock-concrete interaction on the seismic response for an underground engineering is studied. The influence law of the mechanical properties of the interface on the seismic response for the lining structure of an underground engineering is further analyzed. The summarized results are noted as following points. Under the action of earthquake，the interface has a significant impact on the displacement response of the surrounding rock，especially the surrounding rocks at the arched shoulder are more vulnerable to damage. In the horizontal direction，the surrounding rocks in the top arch area are mainly tensioned，and other surrounding rocks are mainly pressed. At the same time，in the vertical direction，the surrounding rocks at both sides of the chamber are tensioned，and the surrounding rocks at the invert arch and the top arch are mainly subjected to compression. The interface destroys the integrity and continuity of the rock-concrete system，so that the superposition of reflection and refraction generated by the incident wave after passing through the interface increases the displacement response of the lining，especially the lining at the inverted arch and the side walls. The internal forces response of the lining has a decreasing trend，but there is a certain regional effect，in which the shear force at the vault，the arch bottom and the arched sides are larger than the shear force without the interface. The influence of the mechanical parameters of the interface on the seismic response of the tunnel lining is different. Among them，the stiffness of the interface plays a leading role to the influence on the internal forces. The friction coefficient，cohesion and tensile strength of the interface have little effect on the thrust and bending moment of the lining. Moreover，the influence of cohesion and tensile strength on the axial force and bending moment of the lining is“anti-symmetric”along the centerline of the cavern. The response of the thrust and bending moment of the lining is nonlinearly related to the tensile strength. These research results reflect the necessity of considering rock-concrete interaction.

Key words： tunnelling engineering surrounding rock lining；interface dynamic response influence factors

引用本文:

梅贤丞1，2，崔臻1，2，盛谦1，2，陈柳洁3，周兴涛1，2，张亚超4 . 围岩–衬砌接触力学特性对地下工程地震动力响应的影响研究[J]. 岩石力学与工程学报, 2019, 38(S2): 3634-3645.
MEI Xiancheng1，2，CUI Zhen1，2，SHENG Qian1，2，CHEN Liujie3，ZHOU Xingtao1，2，ZHANG Yachao4. Analysis of the seismic response for an underground engineering in consideration of rock-concrete interaction. , 2019, 38(S2): 3634-3645.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2019.0088 或 http://rockmech.whrsm.ac.cn/CN/Y2019/V38/IS2/3634

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