摘要
以深中通道东人工岛土石围堰内部基坑三级放坡开挖工程为例,应用有限元分析放坡开挖对土石围堰岛壁的综合影响。结论如下:基坑内部降水后渗流主要发生在堰体底部,堰体渗流场较稳定;基坑放坡开挖过程中,围堰岛侧坡角处变形量不断增大,坡脚土体的水平变形促进了上方土体的隆起,最大变形出现于基坑底部;基坑开挖部分的法向有效应力呈层状分布,应力值随基坑的开挖而减小;基坑边坡稳定性随放坡级数的增加而有所下降。
Taking the three-stage excavation project of the inner foundation pit of the earth and rock cofferdam of the east artificial island of Shenzhen-zhong Passage as an example,the comprehensive influence of the excavation on the island wall of the earth and rock cofferdam is analyzed by the finite element method.The conclusions are as follows:the seepage in the foundation pit after dewatering mainly occurs at the bottom of the barrier body,and the seepage field of the barrier body is stable.In the process of excavation,the deformation at the side slope angle of the cofferdam island increases continuously,and the horizontal deformation of the soil at the slope foot promotes the uplift of the soil above,and the largest deformation occurs at the bottom of the foundation pit.The normal effective stress of the excavation part of the foundation pit shows a layered distribution and the stress value decreases with the excavation of the foundation pit.The stability of foundation pit slope decreases with the increase of slope series.
作者
吴达
卢金栋
WU Da;LU Jin-dong(China Railway Tunnel Consultants Co.Ltd.,Guangzhou 511458,China)
出处
《工程建设与设计》
2022年第18期19-21,共3页
Construction & Design for Engineering
关键词
土石围堰
稳定性分析
基坑开挖
安全系数
earth-rock cofferdam
stability analysis
foundation pit excavation
safety factor
