摘要
文章采用有限元分析软件建立了软土地区深基坑开挖三维数值仿真模型,考虑了两种工程常用的降水工况,对比了两种工况条件下深基坑开挖引起的支护结构水平位移和地表沉降变形差异。结果表明:地下连续墙水平位移出现在中上部,不同降水工况下地下连续墙水平位移随深度变化趋势基本一致,但数值差异较明显。周边地表沉降在距离基坑位置10 m附近达到峰值后逐渐下降。支撑结构对地表沉降产生了一定的约束限制,导致其地表沉降未呈线性变化。相比之下,分步降水相较于一次降水能有效减少周边地表的沉降和支护变形。
A three-dimensional numerical simulation model for deep foundation pit excavation in soft soil areas was established using finite element analysis software.Two commonly used dewatering conditions in engineering were considered,and the differences in horizontal displacement and surface settlement deformation caused by deep foundation pit excavation were compared under the two conditions.The results show that the horizontal displacement of the underground continuous wall occurs in the middle and upper parts,and the trend of the horizontal displacement of the underground continuous wall with depth under different precipitation conditions is basically consistent,but the difference between the values is more obvious.The settlement of the surrounding surface reaches its peak near 10 meters from the excavation site and gradually decreases.The supporting structure imposes certain constraints on surface subsidence,resulting in non linear changes in surface subsidence.In contrast,step-by-step precipitation can effectively reduce the settlement and support deformation of the surrounding surface compared to one-time precipitation.
作者
何巨
HE Jv(Xiantao Survey and Design Institute,Xiantao 433000,Hubei,China)
出处
《工程技术研究》
2024年第3期216-218,共3页
Engineering and Technological Research
关键词
深基坑
软土
地下连续墙
数值模拟
deep foundation pit
soft soil
underground continuous wall
numerical simulation
