摘要
为研究下伏岩溶地层隧道结构的地震动响应,基于黏弹性人工边界理论,编写了等效荷载时程施加程序,计算并分析了洞隧间距、洞径大小及溶洞跨径比对隧道结构地震响应特性的影响。研究结果表明:结构地震响应随着洞径的增大而增大,随着洞隧间距的增大逐渐趋于平缓;围岩与结构的加速度响应均与节点位置深度呈非线性相关,且围岩加速度响应略大于同深度的隧道结构。溶洞跨径比对结构的加速度响应和应力响应影响不同。结构的主拉应力峰值与洞隧间距呈负相关,结构下部主拉应力峰值包络图随着洞径的增大略向拱底靠拢,且主拉应力峰值最大值均出现在拱脚附近。研究结果对隧道结构设计、建设及监测具有指导意义。
In order to analyze the seismic response of tunnel in underlying karst stratum,the program of equivalent load time history is compiled,based on the viscous-spring boundary principle.The effects of seismic response of tunnel have been discussed,such as intervals between tunnel and cave,cave sizes and height to width ratios of cave.The results are as follows.The seismic response of tunnel increases with the increases of tunnel diameter,gradually flattens with the increase of intervals.The acceleration response of surrounding rock and structure show a nonlinear relationship to the node depth,and the acceleration response of surrounding rock is slightly greater than structure of the same depth.The structural acceleration response and stress response are different influenced by the cave span ratio.The structural principal tensile stress is negatively correlated with the intervals.The principal tensile stress peak envelope at the lower part of tunnel gradually draws closer to the arch bottom with the increase of cave diameter,and all the maximums of principal tensile stress peak appear near the arch feet.The results could be used to guide the design and construction of similar projects.
作者
李明达
张昱
孟康
周晶
LI Mingda;ZHANG Yu;MENG Kang;ZHOU Jing(State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian,Liaoning 116024,China;Institute of Earthquake Engineering,Faculty of Infrastructure Engineering,Dalian University of Technology,Dalian,Liaoning 116024,China)
出处
《水利与建筑工程学报》
2021年第2期120-125,共6页
Journal of Water Resources and Architectural Engineering
基金
国家重点研发计划课题(2016YFC0802402)。
关键词
隧道
地震响应
粘弹性边界
溶洞
主拉应力
tunnel
seismic response
viscous-spring boundary
karst cave
principal tensile stress
