某红层深挖路堑基底上拱离心模型试验研究  

An Experimental Study on Centrifugal Model of Upheaving of Deep Cutting Base in the Red Bed

作　　者：刘毅[1] 程谦恭[2] 陈梦发 常仁举 LIU Yi;CHENG Qiangong;CHEN Mengfa;CHANG Renju(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：《高速铁路技术》2023年第2期70-74,共5页High Speed Railway Technology

摘　　要：本文以成自铁路球溪站深路堑工点为研究对象,开展了外业调查、资料整理和模型选取,通过离心机模型试验分析开挖深路堑前后应力场和位移变化规律,探究路堑坡体开挖后基底不同深度水平应力与竖向应力变化的特征、相对大小关系及变形情况,结果表明:(1)深路堑坡体开挖后,基底埋深一定深度范围内,水平应力调整为大于竖向应力,基底中部上拱变形量最大;(2)水平应力与竖向应力的大小关系是导致深路堑基底产生上拱变形的关键因素。Based on a case study of the deep cutting made on the construction site of Qiuxi Station of the Chengdu-Zigong Railway by field investigation,data sorting,and model selection,the change rules of stress field and displacement before and after excavation of deep cutting were analyzed in this paper by centrifuge model test,and the change characteristics,relative magnitude relationship of horizontal and vertical stress at different depths of the base after excavation of cutting slope and the deformation of the base were explored.The results show that:(1)After the excavation of the deep cutting slope,the horizontal stress is adjusted to be greater than the vertical stress within a certain depth of the base,and the upheaval deformation in the middle of the base is the largest.(2)The relationship between horizontal and vertical stress is the key factor leading to upheaval deformation of the deep cutting base.

关 键 词：红层软岩 离心模型试验 应力状态 位移变形 

分 类 号：U416.13[交通运输工程—道路与铁道工程]