高速列车振动下软土震陷对水下盾构隧道的影响  

Influence of Soft Soil Seismic Subsidence on Underwater Shield Tunnel under High-speed Train Vibration

作　　者：齐春 王闯 胖涛[1] 晏启祥[2] QI Chun;WANG Chuang;PANG Tao;YAN Qixiang(China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China;Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]中铁二院工程集团有限责任公司,成都610031 [2]西南交通大学,成都610031

出　　处：《路基工程》2024年第3期112-117,共6页Subgrade Engineering

摘　　要：依托广州至湛江高速铁路湛江湾海底隧道工程,建立“地层-隧道-道床”数值模型,从不同软土层厚度和软土层相对位置两方面,研究高速列车振动下软土震陷对盾构隧道结构的影响。结果表明:盾构隧道沉降随软土厚度增加而增加,而加速度响应与软土厚度关系不大,速度响应初始时变化不大(软土厚度11.0~20.0 m),而后有所下降(软土厚度20.0~21.5 m),最后又迅速增大(软土厚度21.5 m以上);盾构隧道的动力响应受软土层位置影响较大,隧道未通过软土地层时,沉降量与速度值较小;隧道部分通过软土地层时,沉降量与速度值随着断面通过软土的比例增加而较快增加;隧道全断面通过软土地层时,沉降量与速度值增长迅速。Based on the Zhanjiang Bay undersea tunnel project of Guangzhou-Zhanjiang high-speed railway,a numerical model of"strata-tunnel-track bed"was established to study the influence of soft soil seismic subsidence on shield tunnel structure under high-speed train vibration from different thicknesses and relative position of soft soil layer.The results show that the settlement of the shield tunnel increases with the increase of the thickness of the soft soil,while the acceleration response has little to do with the thickness of the soft soil.The velocity response does not change much at the beginning(when the thickness of the soft soil is 11.0-20.0 m),and then decreases(when the thickness of the soft soil is 20.0-21.5 m),and finally increases rapidly(the thickness of the soft soil is more than 21.5 m).The dynamic response of a shield tunnel is greatly affected by the position of the soft soil layer.When the tunnel does not pass through the soft soil layer,the settlement and velocity values are small;when the tunnel partially passes through the soft soil layer,the settlement and velocity values follow the section through the soft soil.When the full section of the tunnel passes through the soft soil layer,the settlement and velocity values increase rapidly.

关 键 词：软土地层 水下盾构隧道 软土厚度 相对位置 软土震陷 敏感性分析 

分 类 号：U25[交通运输工程—道路与铁道工程]