基于有限元的不同回填料对顶进涵过渡段沉降影响分析  

Analysis of the Influence of Different Backfills on the Settlement of Jacking Culvert Transition Section Based on Finite Element Method

作　　者：陈智刚 华永利 盛世勇 蔡磊 周鹏鹏 李盛[1] CHEN Zhigang;HUA Yongli;SHENG Shiyong;CAI Lei;ZHOU Pengpeng;LI Sheng(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Ministry of Works,China Railway Lanzhou Group Co.,Ltd.,Lanzhou 730030,China)

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070 [2]中国铁路兰州局集团有限公司工务部,甘肃兰州730030

出　　处：《兰州工业学院学报》2022年第2期52-56,共5页Journal of Lanzhou Institute of Technology

基　　金：国家自然科学基金(5166803651868041);甘肃省基础研究创新群体项目(21JR7RA347)。

摘　　要：基于有限元差分软件FLAC ^(3D)建立既有铁路线路顶进涵模型,研究了不同回填料对顶进涵过渡段沉降的影响。结果表明:分别采用级配I碎石掺5%水泥、素混凝土以及泡沫混凝土作为回填料时,顶进涵过渡段均发生沉降,对比沉降曲线可知,容重等级为W5的泡沫混凝土更有利于列车的平稳行驶,为最优回填料;对比不同回填高度下的过渡段沉降曲线可知,最优回填高度为1 m。该研究结果可为顶进涵过渡段的回填料选择提供参考。Based on the finite element difference software FLAC ^(3D),the jacking culvert model of existing railway was established to study the influence of different backfills on the settlement of the transition section of the jacking culvert.The results show that when graded gravel mixed with 5%cement,plain concrete and foamed concrete are used as backfills,settlement occurs in the transition section of jacking culvert.By comparing the settlement curves,the foamed concrete with bulk density grade of W5 is more conducive to the smooth running of the train and is the optimal backfill.Comparing the transition section settlement curves at different backfill heights,the optimal backfill height is 1m.The research results can provide reference for the selection of backfill in the transition section of jacking culvert.

关 键 词：顶进涵 回填料 数值模拟 沉降分析 

分 类 号：TU43[建筑科学—岩土工程]