近接长距离并行地铁隧道的地震响应特性  

Seismic characteristic of small spacing and long parallel subway tunnel

作　　者：鲍艳[1,2] 李文辉[1,2] 安军海[1,2] 李晓霖[1,2] 

机构地区：[1]北京工业大学城市与工程安全减灾省部共建教育部重点实验室,北京100124 [2]北京城市交通协同创新中心,北京100124

出　　处：《黑龙江科技大学学报》2016年第2期207-213,218,共8页Journal of Heilongjiang University of Science And Technology

基　　金：国家自然科学基金项目(90715035);国家自然科学基金面上项目(41272337);国家自然科学基金创新研究群体项目(51421005)

摘　　要：基于FLAC3D软件计算平台,建立小间距、长距离并行地铁隧道的三维数值模型,研究双线隧道在强地震动作用下的地震反应特性,并与单体隧道的地震反应特性进行比较。结果表明:单体隧道与并行隧道的地震变形模式均为椭圆状,而并行的两隧道之间会产生明显的相互作用使其各自的地震反应增大;对于斜向并行和上下叠落的双线隧道,下层隧道的地震应力放大率及峰值加速度均明显大于上层的,且往往大于相应埋深的单体隧道,下层隧道更偏于危险;双线并行隧道的变形、水平应力及加速度均受埋深影响较大,地震变形和加速度均随着埋深的减小而增加,水平应力随着埋深的增加而增加。近接长距离并行地铁隧道地震响应与隧道净距及基岩输入地震动的特性有关。This paper proposes a three-dimensional numerical model designed for long distance paral- lel subway tunnels of small spacing, based on FLAC^3D software computing platform. The study investi- gates the reaction characteristics of double line tunnels exposed to strong earthquakes, and compares the characteristics with that of the single tunnels. The results show that both single tunnels and parallel tun- nels are subjected to oval-shaped deformations, and a significant interaction between two parallel tunnels is responsible for an obvious increase in the seismic response for them; seismic stress magnification and peak acceleration are obviously greater for lower tunnels than for the upper layers in oblique parallel tun- nels and overlapped parallel ones and they are often greater than single tunnel of corresponding buried depth, suggesting a greater danger for the lower tunnels; double parallel tunnels are subjected to the de- formation, horizontal stress and acceleration more greatly affected by buried depth, to seismic deformation and acceleration increasing with the depth decreasing, and to the horizontal stress increasing with the depth increasing; long distance parallel subway tunnels have the seismic response related to the tunnel clear distance and seismic characteristic input to the bedrock.

关 键 词：地铁隧道 小间距 长并行 地震作用 

分 类 号：TU452.28[建筑科学—岩土工程]