摘要
以西南某铁路车站软岩路堑开挖为对象,通过监测施工动态与建立FLAC3D数值模型,分析软岩路堑开挖变形特征。研究表明:开挖导致基底中部下伏浅部地层先期沉降,后期回弹,数值量级较小;软岩开挖变形在发育较好的层理面特征鲜明;模拟得到基面中部与边坡坡脚位移和应力与开挖步数的关系,开挖导致的基面变形具有差异性,且与实际监测数据吻合良好,能对开挖过程中的变形量与深度等特征加以佐证。
Taking the soft rock cutting along a railway station in the southwest as the research object,by dynamic monitoring on the cutting excavation and establishing a FLAC3D numerical model,the deformation characteristics of soft rock cutting excavation are analyzed.The results of the research show that,the excavation leads to early settlement and later rebound of underlying shallow ground in the middle of the base,and the numerical order of magnitude is small;the deformation of soft rock excavation has distinct characteristics on the well-developed bedding plane;by numerical simulation,the relationship of the displacement and stress in the middle of base plane and at the foot of slope relates to the excavation steps is obtained,and the deformation of base plane resulted from the excavation are different and agree well with the monitoring data,which may be the evidence to the deformation amount,depth and other characteristics of excavation.
作者
陈梦发
刘毅
程谦恭
常仁举
任雨欣
CHEN Mengfa;LIU Yi;CHENG Qiangong;CHANG Renju;REN Yuxin(Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 611756,China;China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)
出处
《路基工程》
2022年第2期100-104,共5页
Subgrade Engineering
基金
第二次青藏高原综合科学考察(2019QZKK0905)
中国中铁二院工程集团有限责任公司科研项目(科2019-096)。
关键词
软岩路堑
现场观测
数值模拟
开挖变形
soft rock cutting
field observation
numerical simulation
excavation deformation
