论文部分内容阅读
以常州地铁1号线为工程背景,建立了某一区间段双向盾构隧道的三维有限元计算模型。根据沿线Ⅲ类场地类别,基于随机地震动模型合成输入所需的多点随机地震动。计算双向盾构隧道在非一致随机地震动作用下的反应,与一致地震动激励的结果进行对比分析,得出该类场地条件下地震反应的一般特征。结果表明:非一致地震动激励增大了隧道的地震响应,沿隧道轴向方向各点地震反应存在差异,这种差异会影响轴向方向上的应力、应变,对隧道安全存在不可忽略的影响。
Taking the Changzhou Subway Line 1 as the engineering background, a three-dimensional finite element model of a bidirectional shield tunnel in a section is established. According to the type III site along the line, a multi-point random ground motion input is synthesized based on the random ground motion model. The response of the two-way shield tunnel under non-uniform stochastic ground motion is calculated and compared with the results of the consistent ground motions. The general characteristics of the seismic response under such site conditions are obtained. The results show that non-uniform ground motions increase the seismic responses of the tunnels. There is a difference in the seismic responses along the axial direction of the tunnel. Such differences affect the axial stress and strain and have a negligible impact on the tunnel safety .