岩溶位置及组合效应对隧道的地震响应分析  

Seismic Response Analysis of Tunnel under Karst Cave Locations and Combinatorial Effect

作　　者：李明达 张昱[1,2] 周晶 LI Mingda;ZHANG Yu;ZHOU Jing(State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China;Institute of Earthquake Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学海岸与近海工程国家重点实验室,辽宁大连116024 [2]大连理工大学工程抗震研究所,辽宁大连116024

出　　处：《防灾减灾工程学报》2022年第3期472-479,共8页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家重点研发计划课题(2016YFC0802402)资助。

摘　　要：为研究岩溶地区隐伏溶洞对隧道结构的地震动响应特性,基于粘弹性人工边界理论,编写了等效荷载时程施加程序,计算并分析了隧道结构环向五种岩溶位置(0°~180°)及其八种位置组合效应对隧道结构地震响应特性的影响。结果表明:结构的节点加速度响应随其距围岩顶部距离的增大而增大。两个单独溶洞(90°、180°)作用与其组合效应相比,180°位置的溶洞对拱底的加速度响应具有一定的减弱作用。位置组合效应条件下,结构应力变化较大的范围为结构环向的1/4;由于溶洞的相互作用,结构的应力包络图略小于两个单个溶洞作用下包络图的最外缘。无论单个溶洞还是位置组合效应下,结构应力受影响较大的范围均在拱肩及拱脚附近。研究结果对隧道结构设计、建设及监测具有指导意义。To investigate the seismic response of tunnels under concealed caves in the karst cave zone,the program of equivalent load time history was compiled,based on the viscous-spring boundary principle.Detailed discussions were presented regarding the seismic response of tunnels under different conditions,such as five karst cave locations at the structural circumference and eight positional combination effects.The results show that the node acceleration response of structures increased with the increase in distance between the node and the top surface of the surrounding rock.Compared with the combinatorial effect of the cave at 90°and 180°locations,the cave at 180°has a certain weakening effect on the acceleration response of the structure bottom.Under the positional combination effect,the stress variation range is roughly a quarter of the structure.Due to the interaction of the karst caves,the structural stress envelope diagram is slightly smaller than the outermost edge of the envelope diagram under the action of two single caves.Whether the action of a single cave or the combinatorial effect,the influence range of structural stress under karst caves is around the spandrel and arch foot of the structure.The conclusions drawn in this study provide a practical reference for the design,construction,and monitoring of similar projects.

关 键 词：隧道 地震响应 粘弹性边界 溶洞 主拉应力 主压应力 

分 类 号：TU354[建筑科学—结构工程]