软土环境重载列车振动荷载作用下的边坡动力响应分析  

Dynamic response analysis of slope under heavy-haul trains in soft soil environment

作　　者：倪中田 姜涛 徐翔 王晟华 NI Zhongtian;JIANG Tao;XU Xiang;WANG Chenghua(College of Civil Engineering,Hebei University of Architecture,Zhangjiakou,Hebei 075000,China;Hebei Innovation Center of Transportation Infrastructure in Cold Region,Zhangjiakou,Hebei 075000,China;Beiwang Group Co.,Ltd.,Chengde,Hebei 067000,China)

机构地区：[1]河北建筑工程学院土木工程学院,河北张家口075000 [2]河北省寒冷地区交通基础设施工程技术创新中心,河北张家口075000 [3]北旺集团有限公司,河北承德067000

出　　处：《河北建筑工程学院学报》2023年第3期26-31,共6页Journal of Hebei Institute of Architecture and Civil Engineering

摘　　要：基于某城际铁路工程,通过FLAC3D有限差分软件进行数值模拟,分析列车不同运行距离与速度下边坡的动力响应。结果表明:重载列车荷载作用下,最大主应力集中在边坡底部,随着边坡高度以及铁路与边坡距离的增加而减小。软土边坡的竖向与水平峰值加速度随着铁路与边坡距离的增大而衰减,说明当边坡与震源的距离增加后列车振动荷载对边坡的影响也随之减小。坡脚附近监测点的峰值加速度显著大于其他监测点,坡脚位置处更容易受到列车荷载影响而振动破坏。峰值加速度值越大的监测点,其峰值加速度随着边坡与铁路距离增加的衰减率越大,边坡下部对于运行距离相关的加速度衰减要比边坡其余部分更敏感。列车时速与水平、竖向峰值加速度都呈现正相关关系。Based on an intercity railway project,numerical simulation was carried out through FLAC3D finite-difference software to analyze the dynamic response of the train under different running distances and speeds of the slope.The results show that the maximum principal stress is concentrated at the bottom of the slope under the action of the heavy-haul train load,and decreases with the increase of the height of the slope and the distance between the railway and the slope.The vertical and horizontal peak accelerations of the soft soil slope attenuate with the increase of the distance between the railway and the slope,indicating that the influence of the train vibration load on the slope decreases when the distance between the slope and the source increases.The peak acceleration of the monitoring points near the toe of the slope is significantly greater than that of other monitoring points,and the position of the toe of the slope is more susceptible to vibration damage due to the influence of the train load.The larger the peak acceleration value of the monitoring point,the greater the attenuation rate of the peak acceleration as the distance between the slope and the railway increases,and the lower part of the slope is more sensitive to the acceleration attenuation related to the running distance than the rest of the slope.There is a positive correlation between the train speed and the horizontal and vertical peak accelerations.

关 键 词：重载列车 振动荷载 边坡 动力响应 数值模拟 

分 类 号：U213.13[交通运输工程—道路与铁道工程]