期刊论文

Law of Deformation for Large-Scale Deep Foundation Pit Excavated in a Complex Environment

中文

矿冶工程

0253-6099

2020

40

2

33-36,42

10.3969/j.issn.0253-6099.2020.02.007

广州地铁集团有限公司科研项目（2020）；

本校为第一机构

为了研究复杂环境下超大深基坑开挖变形演化规律,利用仿真分析软件FLAC~(3D)对基坑开挖支护过程中基坑周边土体地表沉降变化规律、墙后土体水平位移变化规律以及支撑轴力变化规律等进行了研究。结果表明,基坑周边土体地表沉降沿基坑水平方向最初呈递增的趋势,在距离墙后13 m左右处达到沉降最大值,此后逐渐减小,地表沉降趋势整体呈“镰刀”形变化;墙后土体水平位移与基坑挖深成正相关关系,且挖深越大,“凸肚”现象越明显;支撑轴力随基坑开挖工作的进行逐渐增大,前3道支撑最大轴力出现在支撑中部附近,第4道支撑最大轴力出现在支撑端部附近。研究成果对基坑设计、施工具有一定参考价值。

In order to analyze the law of deformation of large-scale deep foundation pit excavated in a complex environment,laws of groud surface settlement of surrounding soil body,horizontal displacement of soil behind the wall and variation of brace axial forces in the process of the excavation and supporting of the foundation pit were investigated by simulation and analysis with FLAC~(3D). The results show that,the groud surface settlement of the surrounding soil body of the foundation pit is initially increased in the horizontal direction,and then gr...