复杂地层中深大基坑开挖变形特征和优化设计
Excavation deformation characteristics and optimization design of deep and large foundation pit in complex strata
潘有旺 1王楠 2张宗盛 1程远江2
作者信息
- 1. 甘肃省建筑科学研究院 (集团) 有限公司,兰州 730070
- 2. 兰州交通大学土木工程学院,兰州 730070
- 折叠
摘要
复杂地层中的基坑开挖对周边环境会产生很大的干扰和影响.以兰州市兰石 14#地块建设项目基坑为工程背景,运用有限元软件MIDAS进行基坑开挖数值模拟,同时结合现场监测数据进行研究分析.结果表明:在基坑开挖过程中桩身水平位移最大为 13·5mm,基坑周边竖向位移最大为 12·1mm,桩身及锚索受力与基坑开挖深度呈正比关系且满足规范要求.同时针对原有基坑设计方案进行了优化分析,对比了不同放坡坡率和不同桩径等影响因素.结果显示:当采取 600mm桩径、桩间距为 1·2m的支护桩,放坡坡率为 1∶0·5 时,基坑变形与原设计基本一致,优化后的开挖支护方案可有效降低基坑的开挖支护成本.
Abstract
The excavation of foundation pit in complex strata will have a great disturbance and impact on the surrounding environment.Taking the foundation pit of Lanshi 14#plot construction project in Lanzhou City as the engineering background,the numerical simulation of foundation pit excavation was carried out by using finite element software MIDAS,the research and analysis were carried out in combination with on-site monitoring data.The results show that the maximum horizontal displacement of the pile body is 13.5mm and the maximum vertical displacement around the foundation pit is 12.1mm during the excavation of the foundation pit,the force of the pile body and bolt is proportional to the excavation depth of the foundation pit and meets the requirements of the specification.At the same time,the optimization analysis of the original foundation pit design scheme was carried out,the influencing factors such as different sloping rates and different pile diameters were compared.The results show that when adopting support pile with the 600mm pile diameter,pile spacing of 1.2m and sloping rate of 1∶0.5,the deformation of the foundation pit is generally consistent with the original design,and the optimized excavation support scheme could effectively reduce the excavation support cost of the foundation pit.
关键词
复杂地层/深大基坑/数值模拟/基坑变形/优化设计Key words
complex strata/deep and large foundation pit/numerical simulation/deformation of foundation pit/optimized design引用本文复制引用
基金项目
国家自然基金地区科学基金项目(52168070)
甘肃省科技计划资助(22JR8RA330)
出版年
2024
NETL
NSTL
万方数据