地铁列车振动作用下盾构隧道及周边土体动力响应规律
Research on Dynamic Response Law of Shield Tunnel and Surrounding Soil Based on Vibration Action of Subway Train
王晓睿 1秦文茜 1于怀昌1
作者信息
- 1. 华北水利水电大学地球科学与工程学院,河南郑州 450045
- 折叠
摘要
为研究小半径曲线段列车荷载作用下隧道周边土体动力响应的影响,以郑州地铁一号线为背景,对孔隙水压力、水位进行现场实测,采用有限元软件MIDAS开展数值分析,研究列车振动荷载下隧道周边土层动力响应变化规律.研究结果表明:列车运营过程中,振动荷载的施加是导致孔隙水压力变化的重要原因;埋深越深孔压越大,随时间增长孔压逐渐减小;距隧道越近土体动力响应对列车振动的反应越敏感,土体中孔隙水压力变化幅度和速率、竖向变形峰值均越大;小半径曲线隧道底部土体的动力响应随列车运行速度的增加而增大;土体产生的超孔隙水压力逐渐消散,可以预测随列车振动对周围土层不会产生变形危害.
Abstract
In order to study the influence of the dynamic response of the soil around the tunnel under the train load in the small radius curve section,the pore water pressure and water level were measured in the field,and the numerical analysis was performed using the finite element software MIDAS.The results show that the vibration load is the important reason for the change of pore water pressure during the operation of the tunnel,the deeper the hole pressure gradually decreases;the closer to the tunnel,the more sensitive is the response to the train vibration dynamic response,the change amplitude and rate of pore water pressure and vertical deformation peak of the water in the soil are larger;the dynamic response of the soil at the bottom of the small radius curve tunnel increases with the train speed;the superpore water pressure generated by the soil is gradually dissipated,it can be predicted that the deformation damage to the surrounding soil with the train vibration.
关键词
小半径曲线/振动荷载/动力响应/孔隙水压力/数值分析/工程地质Key words
small radius curve/vibrational load/dynamic response/pore water pressure/numerical analysis/engineering geology引用本文复制引用
出版年
2024
NETL
NSTL
万方数据