摘要
为研究在昆明市河湖相软土地区的复杂地质条件下,基坑开挖施工过程中的变形特征,以昆明市某地铁站深基坑的工程实例为背景,结合基坑开挖施工过程中支护结构及周围土体变形监测数据,运用MIDAS/GTS NX有限元软件,建立三维模型进行全过程整体的数值模拟分析,对比数值模拟结果和监测数据。结果表明:数值模拟结果与监测数据相比,两者结果差值较小,变化趋势基本一致,验证了有限元数值模拟软件在软土地区深基坑工程中运用具有可行性;地连墙顶竖向位移和墙顶附近土体沉降受基坑坑底软土隆起的因素影响较大;各监测点变形均小于控制值;基坑周边土体沉降和地连墙体变形符合基坑开挖变形规律,验证了基坑设计支护的合理性。研究结果可为昆明河湖相软土地区基坑工程提供经验借鉴。
In order to study the deformation characteristics of the foundation pit excavation under the complex geological conditions of the fluvial-lacustrine soft soil area in Kunming During the construction process,the monitoring data of the deformation of the supporting structure and the surrounding soil are used to establish a three-dimensional model of the MIDAS/GTS NX finite element software to carry out the numerical simulation analysis of the whole process,and compare the numerical simulation results with the monitoring data.The results show that the difference between the numerical simulation results and the monitoring data is small,and the deformation trend is basically the same.The feasibility of applying finite element numerical simulation software in deep foundation pit engineering in soft soil area is verified;The vertical displacement of the top of the diaphragm wall and the settlement of the soil near the top of the wall are greatly affected by the uplift of the soft soil at the bottom of the foundation pit the deformation of each monitoring point is less than the control value;The settlement of the soil around the foundation pit and the deformation of the diaphragm wall wall conform to the law of excavation and deformation of the foundation pit,which verifies the rationality of the design and support of the foundation pit.The research results can provide experience and reference for foundation pit engineering in Kunming fluvial-lacustrine soft soil area.
作者
蔡映坤
李波
和子祺
马云燕
CAI Ying-kun;LI Bo;HE Zi-qi;MA Yun-yan(Faculty of Land and Resources Engineering,Kunming University of Science and Technology,Kunming 650093,China)
出处
《地质灾害与环境保护》
2023年第2期72-77,共6页
Journal of Geological Hazards and Environment Preservation
关键词
河湖相软土
深基坑
变形
数值模拟
fluvial-lacustrine soft soil
deep foundation pit
deformation
numerical simulation
