液化地层盾构隧道碎石桩加固地震响应分析  

Seismic Response Analysis of Gravel Pile Reinforcement for Shield Tunnels in Liquefied Stratum

作　　者：李艺林 庞明[1] 李铮 杨猛 于静涛 LI Yi-lin;PANG Ming;LI Zheng;YANG Meng;YU Jing-tao(China Road and Bridge Corporation,Beijing 100011,China;Key Laboratory for Bridge and Tunnel of Shaanxi Province,Chang’an University,Xi'an 710064,China)

机构地区：[1]中国路桥工程有限责任公司,北京市100011 [2]长安大学桥梁与隧道陕西省重点实验室,西安市710064

出　　处：《公路》2022年第9期432-438,共7页Highway

基　　金：中国交通建设集团科研项目,项目编号CCCC-KTP-01;中国路桥工程有限责任公司科研项目,项目编号CRBC-KTP-02。

摘　　要：液化地区盾构隧道后期运营期间可能发生沉降或上浮、管片病害等,维修及养护难度大,采取有效的液化加固处置措施有利于减少盾构周围土层变形及盾构运营期间的病害。以孟加拉国卡纳普里河底隧道为依托,利用FLAC 3D中的Finn模块建立土层和隧道三维模型,利用Mohr-Coulomb模型模拟碎石桩加固,在重力平衡和水压力平衡后施加合理的地震波,对加固前后目标断面周围地层的最大孔压比、最大超静孔隙水压力和抗浮性能进行动力计算和对比分析,评估碎石桩的液化加固效果。计算结果表明,采用适当的液化处理措施可以很好地改善结构和土层的动力响应,对类似工程的抗震设计和液化地基处理具有较好的借鉴作用。Settlement or floating and segment diseases etc.may occur during the later operation of shield tunnel in liquefied area,which is difficult to repair and maintain,and effective liquefaction reinforcement treatment measures are helpful to reduce the deformation of soil layer around the shield and diseases during the operation of the shield.Based on the tunnel under the Karnaphuli River in Bangladesh,in this paper the Finn module in FLAC 3 D is used to build the three-dimensional model of the soil layer and the tunnel,and the Mohr-Coulomb model is applied to simulate the reinforcement of gravel piles.After the balance of gravity and water pressure,a reasonable seismic wave is applied,and the dynamic calculation and comparative analysis of the maximum pore pressure ratio,maximum excess pore water pressure and anti-floating performance of the stratum around the target section before and after reinforcement are carried out to evaluate the liquefaction reinforcement effect of the gravel pile.The calculation results show that appropriate liquefaction treatment measures can well improve the dynamic response of the structure and soil layer,which can be used as a reference for seismic design and liquefaction foundation treatment of similar projects.

关 键 词：盾构隧道 液化地区 碎石桩加固 抗浮性能 抗震设计 

分 类 号：U455.43:U459.5[建筑科学—桥梁与隧道工程]