软土隧道交通荷载下动力响应分析  

Dynamic Response Analysis of Soft Soil Tunnel under Traffic Load

作　　者：蔡鑫[1] 孔祥岁 张鹏军 CAI Xin;KONG Xiangsui;ZHANG Pengjun(Shenzhen Transportation Public Facilities Construction Center,Shenzhen 518048;Shenzhen Dongguan Investment Group Co.,Ltd.,Shenzhen 518049;Civil Engineering Center of Ministry of Education Information Technology,Tongji University,Shanghai 200092)

机构地区：[1]深圳市交通公用设施建设中心,深圳518048 [2]深圳市东关投资集团有限公司,深圳518049 [3]同济大学土木信息技术教育部工程研究中心,上海200092

出　　处：《现代隧道技术》2020年第S01期321-327,共7页Modern Tunnelling Technology

摘　　要：文章基于Mohr-Coulomb土体破坏准则,采用地层结构法建立了地层隧道的三维有限元模型,并将不同车辆荷载简化后施加到隧道结构上,来研究管片厚度、车辆荷载和车辆速度等因素对隧道端部土体的动力反应特性和响应规律。结果表明,随着隧道端部软土厚度的增加,其竖向动应力和加速度相应减小;车辆的行驶速度与隧道端部软土加速度和竖向动应力的增长呈正相关关系,而车辆荷载变化可以显著改变软土加速度和竖向动应力;相对而言,管片厚度对软土加速度和竖向动应力影响最小。Based on the Mohr-Coulomb failure criterion of soil,using the large general geotechnical soil finite element software Midas/GTS,a 3D FEM model of the tunnel is built.It studies the effect of segemtn thickness,vehicle load and vehicle speed on dynamic response characteristics and laws at the bottom of tunnel by applying the simplified vehicle load on tunnel structure according to the type of vehicle load,with the results showing that the acceleration and vertical dynamic stress of the soft soil decreases with the increase of the thickness of the soft soil at the bottom of the tunnel center,and the increase of vehicle speed and vehicle load will increase the acceleration and vertical dynamic stress of soft soil at the bottom of the tunnel center,and the load change of vehicle will significantly change the acceleration and vertical dynamic stress of soft soil,and the acceleration and vertical dynamic stress of soft soil are relative least affected by segment thickness.

关 键 词：交通荷载 动力响应 三维有限元 软土隧道 

分 类 号：U455[建筑科学—桥梁与隧道工程]