摘要
对于基坑周边土压力不平衡条件下的基坑支护体系,传统的基坑开挖计算理论和常规的基坑工程设计软件无法充分考虑基坑施工过程中的空间效应。以武汉某深基坑工程为例,运用有限差分数值软件建立三维数值计算精细化模型,计算支护体系及周边环境的位移场及应力场,分析地形起伏、施工荷载不均匀分布等因素引起的不平衡土压力对深基坑工程施工过程中承载变形规律的影响。研究表明:不平衡土压力对基坑承载变形特性有明显的影响,基坑在不平衡土压力作用下可能会整体向一侧倾斜;基坑施工过程中存在显著的空间效应,基坑长边与短边互为支座,但长边对短边的支撑效应要比短边对长边的支撑效应更加显著。
The traditional analysis theory of the deep excavation and the conventional excavation engineering design software cannot fully consider the spatial effect in the deep excavation construction process.This paper presents an excavation engineering in Wuhan.The finite difference numerical software was used to establish the three-dimensional numerical model of the area to be excavated.Through the estimation of the displacement field and the stress field of the supporting system and the surrounding environment,analysis of variation of the uneven terrains,the construction deformation induced by the unbalanced earth pressures in the process of deep foundation are investigated.The results show that the unbalanced earth pressure has obvious influence on the bearing deformation characteristics of the excavated area.The supporting structure may be globally tilted due to the unbalanced earth pressures.There are significant spatial effects in the process of the deep excavation construction.The long side and the short side of the excavated area are mutual supports,but the supporting effect of the long side to the short side is more significant than that of the short side to the long side.
作者
曹明
CAO Ming(Central and Southern China Municipal Engineering Design&Research Institute Co.Ltd.,Wuhan 430010)
出处
《土工基础》
2024年第1期71-75,共5页
Soil Engineering and Foundation
关键词
不平衡土压力
深基坑
空间效应
数值分析
Unbalanced Earth Pressures
Deep Excavation
Spatial Effect
Numerical Analysis
