饱和细砂地层基坑开挖水土压力分布特征及水土分合算比较  

Characteristics of water and earth pressure of foundation pit in saturated silty sand stratum and comparison between combined and separate calculation of water and earth pressure

作　　者：商兆涛 汪文达 周刚 汪鹏程[2] SHANG Zhaotao;WANG Wenda;ZHOU Gang;WANG Pengcheng(Wuhu Rail Transit(Tunnel) Engineering Quality and Safety Supervision Station, Wuhu 241000, China;School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China)

机构地区：[1]芜湖市轨道(隧道)交通工程质量安全监督站,安徽芜湖241000 [2]合肥工业大学土木与水利工程学院,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2022年第5期639-643,672,共6页Journal of Hefei University of Technology：Natural Science

基　　金：国家自然科学基金资助项目(51579063);安徽省住建厅研究开发资助项目(2019YF-018)。

摘　　要：文章以某饱和细砂地层中盾构井基坑工程为背景,建立FLAC3D三维数值分析模型,通过施加适当的荷载边界、调整土体重度和强度指标,模拟水土合算和水土分算效应,在该基础上进行水土合算和水土分算2种模式下基坑开挖全过程模拟,得到墙背水土总压力分布特征及其随开挖工况的变化趋势、连续墙的变形与应力分布规律、饱和砂土中深基坑开挖水土合算和水土分算结果的差异性。The FLAC3D three-dimensional numerical analysis model was established according to a foundation pit project for shield shaft in saturated silty sand stratum.By applying appropriate loading boundary and adjusting specific gravity and shear strength of the soils,the effects of combined and separate calculation of water and earth pressure were simulated,and the foundation pit excavation with combined and separate calculation of water and earth pressure was simulated numerically.The results show the distribution characteristics and altering trend of water and earth pressure on the retaining wall,the displacement and stress distribution of the retaining wall,and the difference between combined and separate calculation of water and earth pressure in deep foundation pit excavation in saturated sand.

关 键 词：基坑 砂土 水土压力 水土合算 水土分算 

分 类 号：TU432[建筑科学—岩土工程]