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地铁交叉隧道近场强地震反应特性的三维精细化非线性有限元分析

ISSN号：1000-7598
期刊名称：岩土力学
时间：0
页码：3971-3976
语言：中文
分类：TU435[建筑科学—岩土工程;建筑科学—土工工程]
作者机构：[1]南京工业大学岩土工程研究所,南京210009
相关基金：基金项目：国家自然科学基金资助项目（No.90715018）;国家公益性行业（地震）科研专项（N0.200808022）;江苏省高校自然科学重大基础研究项目（N0.08KJA560001）;南京工业大学博士论文创新基金（No.BSCX200912）.
相关项目：复杂地质环境下城市大型地下结构地震破坏机理研究

关键词：地铁交叉隧道, 近场强地震动, 三维精细化有限元, 非线性地震反应特性, intersecting metro tunnel, near-field ground motion, 3D refined nonlinear finite element model, nonlinear seismicresponse characteristics

中文摘要：

基于ABAQus软件研发的显式有限元并行计算集群平台，建立地铁双层交叉隧道结构的三维精细化有限元分析模型，研究了近场强地震动作用下地铁双层交叉隧道的三维非线性地震反应特性，并与浅埋／深埋单层隧道的地震反应特性进行了比较，结果表明：双层隧道的相互作用效应对上、下层隧道顶、底部之间的相对水平位移差具有放大作用；对上、下层隧道的地震应力反应有减小作用；双层隧道上、下层左侧的地震应力反应大于右侧的地震应力反应，隧道拱肩和拱腰处的应力反应明显大于其他部位，拱肩为隧道结构的最危险部位；双层隧道下层顶、底部的峰值加速度反应大于上层顶、底部的峰值加速度反应；双层隧道相互作用效应对上、下层隧道地震反应的影响与双层隧道的交叉形式和基岩输入的近场强地震动特性有关。

英文摘要：

According to the explicit finite element method of ABAQUS and 32 CPU parallel computing cluster platform of the research group, a three-dimensional refined finite element model for cross tunnels is established and used to research the 3D nonlinear seismic response of cross tunnels under near-field strong ground motion and compare the results with that of one-layer upper/lower tunnels. The results show that： compared with a single deep/shallow-buried tunnels, for any one-layer upper/under tunnel of intersecting metro tunnels, the relative horizontal displacement difference of the tunnel top and bottom is magnified; and the seismic stress of intersecting tunnels is reduced; the seismic stress on the left side of tunnels is larger than that of the right side; and the seismic stress of tunnel spandrel and hance is significantly greater than that of other parts; and the tunnel spandrel is the most dangerous part of the tunnel structure. The acceleration response of top and bottom at the under tunnel of intersecting metro tunnels is larger than that of the upper tunnel; the interaction influence of intersecting metro tunnel on the seismic response of any one-layer upper/under tunnel is related to the cross form of intersecting metro tunnels and the characteristics of the inputted near-field ground motion.

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