明挖隧道回填压实过程中填土与衬砌的位移响应  

Displacement Response of Fill and Lining During Backfilling and Compaction in Open Cut Tunnels

作　　者：孙轶轩[1] 代明明 尧俊凯 马洪生 程素明 SUN Yixuan;DAI Mingming;YAO Junkai;MA Hongsheng;CHENG Suming(CCCC Water Transport Planning and Design Institute Co.Ltd.,Beijing 100101,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;Sichuan Highway Planning,Survey,Design and Research Institute Ltd.,Chengdu 610041,China;Chengdu Branch of China Railway No.3 Engineering Group Co.Ltd.,Chengdu 610031,China)

机构地区：[1]中交水运规划设计院有限公司,北京100101 [2]西南交通大学土木工程学院,成都610031 [3]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081 [4]四川省公路规划勘察设计研究院有限公司,成都610041 [5]中铁三局集团有限公司成都分公司,成都610031

出　　处：《铁道建筑》2023年第5期115-119,共5页Railway Engineering

基　　金：四川省交通运输科技项目(2020-A-01);中铁二院工程集团有限责任公司科研项目(科2019-023)。

摘　　要：以成都一轨道交通项目下方明挖隧道为背景,采用ABAQUS软件建立了明挖回填的机-土耦合三维有限元模型,分析了在不同振动碾压车速以及强弱振作用下填筑体以及衬砌的位移响应特征。结果表明:在振动碾压的过程中,位移以及加速度场都呈枣核形传播规律;整体上,位移随着水平距离的增加呈现出减小的趋势,车速为4.5 km/h时对填筑体表面的影响作用较为明显;垂直方向上的位移随着车速改变所产生的变化并不是恒定的,但是相比于弱振,强振对位移造成的影响作用始终是比较明显的;对于衬砌而言,在水平方向0~12 m内位移随速度增加呈现出递减的趋势,而在38~50 m内呈现出位移随速度增加而递增的趋势,并且拱顶处的位移是大于两侧拱腰的,左侧拱腰与右侧拱腰的位移基本接近;当车速为3.0 km/h时,碾压过程对衬砌造成的影响是比较小的。Taking the open cut tunnel under a Chengdu rail transit project as the background,a three-dimensional finite element model of machine soil coupling for open cut backfilling was established using ABAQUS software.The displacement response characteristics of the filling body and lining were analyzed under different vibration rolling speeds and strong and weak vibration effects.The results show that during the process of vibration compaction,the displacement and acceleration fields exhibit a jujube shaped propagation pattern.Overall,the displacement shows a decreasing trend with the increase of horizontal distance,and the impact on the surface of the filling body is more obvious when the vehicle speed is 4.5 km/h.The displacement in the vertical direction is not constant with the change of vehicle speed,however the impact of strong vibration on displacement is always more significant compared to weak vibration.For the lining,the displacement shows a decreasing trend with the increase of velocity between 0 and 12 meters in the horizontal direction,while between 38 and 50 meters,the displacement shows an increasing trend with the increase of velocity.The displacement at the arch crown is greater than that at the two sides of the arch waist,and the displacement values of the left and right arch waist are basically similar.When the vehicle speed is 3 km/h,the impact of the rolling process on the lining is relatively small.

关 键 词：明挖隧道 填筑工程 数值计算 车速 位移响应 

分 类 号：U213.1[交通运输工程—道路与铁道工程]