深基坑开挖对周边建筑物沉降影响的数值模拟  

Numerical Simulation of the Effect of Deep Foundation Pit Excavation on Settlement of Surrounding Buildings

作　　者：彭青顺 詹君宇 PENG Qing-shun;ZHAN Jun-yu(Wuhan Construction Engineering Quality and Safety Center,Wuhan 430014,China)

机构地区：[1]武汉市建筑工程质量安全中心,武汉430014

出　　处：《建材世界》2025年第2期90-94,共5页The World of Building Materials

摘　　要：深基坑开挖对周边建筑物沉降影响显著,合理的数值模拟方法可为工程设计提供科学依据。论文基于三维有限元方法(Finite Element Method,FEM),建立了包含基坑、支护体系及周边建筑物的数值模型,模拟不同开挖工况及关键因素对沉降的影响。研究表明,基坑开挖深度、支护刚度、土层特性及基础形式对建筑物沉降影响显著。浅基础建筑物受基坑开挖影响较大,最大沉降可达30 mm,而桩基础建筑物沉降较小但可能发生桩身侧移。填土地层的沉降量最大,砂土地层表现出显著的差异沉降,而黏土层沉降较均匀但持续时间较长。支护刚度的增加能有效减少地表沉降,但控制效果存在递减趋势。Deep foundation pit excavation has a significant impact on settlement of the surrounding buildings,and a reasonable numerical simulation method can provide a scientific basis for engineering design.Based on the three-dimensional finite element method(FEM),this paper establishes a numerical model containing the foundation pit,the support system and the surrounding buildings,and simulates the effects of different excavation conditions and key factors on settlement.The study shows that the depth of pit excavation,support stiffness,soil layer characteristics and foundation form have a significant effect on the settlement of buildings.Shallow foundation buildings are more affected by pit excavation,and the maximum settlement can be up to 30 mm,while the settlement of pile foundation buildings is small but the lateral movement of pile body may occur.The settlement of the fill layer is the largest,the sand layer shows significant differential settlement,and the clay layer has a more uniform settlement but a longer duration.The increase of support stiffness can effectively reduce the surface settlement,but there is a decreasing trend in the control effect.

关 键 词：深基坑开挖 数值模拟 沉降控制 支护刚度 

分 类 号：TU753[建筑科学—建筑技术科学]