Analysis of the seismic response for an underground engineering in consideration of rock-concrete interaction
MEI Xiancheng1，2，CUI Zhen1，2，SHENG Qian1，2，CHEN Liujie3，ZHOU Xingtao1，2，ZHANG Yachao4
(1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. University of Chinese Academy of Sciences，Beijing 100049，China；
3. School of Civil Engineering，Guangzhou University，Guangzhou，Guangdong 510006，China；4. State Key Laboratory of Coal Resources and Safe Mining，China University of Mining and Technology(Beijing)，Beijing 100083，China)
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.
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.
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2019, Vol. 38 
