基坑开挖对其周边土体变形规律数值模拟和现场试验研究  

NUMERICAL SIMULATION AND FIELD TEST STUDY ON DEFORMATION LAW OF SURROUNDING SOIL DURING EXCAVATION

作　　者：杨曦 李万宝 代柳娟 朱向荣 李韶清 赵智辉 YANG Xi;LI Wan-bao;DAI Liu-juan;ZHU Xiang-rong;LI Shao-qing;ZHAO Zhi-hui(Yunnan aerospace engineering geophysical detection Co.,Ltd,Kunming 650217,China;Ccteg Chongqing Research Institute,Chongqing 400039,China)

机构地区：[1]云南航天工程物探检测股份有限公司,昆明650217 [2]中煤科工集团重庆研究院有限公司,重庆400039

出　　处：《地质灾害与环境保护》2023年第3期74-78,共5页Journal of Geological Hazards and Environment Preservation

基　　金：云南省王思敬院士工作站(202005AF150083)。

摘　　要：以兰花路地铁车站基坑开挖工程为研究对象,利用FLAC3D有限差分元软件建立了围岩应力三维计算模型,采用数值分析和现场试验相结合的手段,对距基坑边缘不同距离、开挖深度不同深度及随时间变化土体水平位移变化规律展开研究。研究表明:由数值模拟结果分析,位于基坑边缘距离10 m之内的土体为高影响区,位于基坑边缘距离10m之外的土体为缓影响区;根据现场试验可得,随着时间的往后推移,相对应的开挖深度逐渐增大,水平位移值逐渐增大,且在前期增长速度较快,其中为凸字形曲线的为正常曲线,较为安全。结合数值模拟结果及现场检测结果,获得基坑开挖过程周边土体时间和空间范围内土体变形规律,为工程作业过程提供降低土体坍塌等安全隐患的范围。This study focuses on the foundation pit excavation project at the Orchid Road subway station.Using the FLAC3Dfinite difference software,a three-dimensional model of the surrounding rock stress was constructed.By combining numerical analysis with field testing,we investigated the soil's horizontal displacement patterns at varying distances from the foundation pit's edge,across different excavation depths,and over time.The analysis reveals that soil within a 10mradius of the foundation pit's edge is in a high-influence zone,while soil beyond this radius falls into a slow-influence zone.Field observations indicate that as time progresses,the excavation depth and the horizontal displacement values both increase,with the rate of growth being especially rapid in the initial phases.Notably,a convex-shaped displacement curve emerges,signifying a typical and relatively safe deformation pattern.By integrating numerical simulation findings with field data,we've delineated the soil deformation patterns in terms of time and space during the foundation pit excavation process.These insights are crucial for defining boundaries to mitigate potential risks,such as soil collapse,during subsequent engineering activities.

关 键 词：基坑工程 数值模拟 现场试验 水平位移 钢支撑 

分 类 号：TU921[建筑科学—建筑设计及理论]