基于流固耦合的深基坑变形与受力分析  

Analysis of deformation and stress of deep foundation pit based on fluid-solid coupling

作　　者：赵延林 李明 侯月文 Zhao Yanlin;Li Ming;Hou Yuewen(School of Architecture & Civil Engineering, Heilongjiang University of Science & Technology, Harbin 150022, China)

机构地区：[1]黑龙江科技大学建筑工程学院,哈尔滨150022

出　　处：《黑龙江科技大学学报》2022年第2期166-173,共8页Journal of Heilongjiang University of Science And Technology

摘　　要：针对降水对深基坑工程的影响问题,基于流固耦合模型与三维固结理论,应用有限元软件MIDAS GTS NX模拟分析了降水井与地连墙深度比、地下水初始水头对深基坑受力与变形的影响。研究表明:基坑周边地表沉降位移、地连墙水平位移与墙身弯矩皆随地下水初始水头的降低而减小,随降水井与地连墙深度比的增加而增加;坑底隆起位移随地下水初始水头的降低而增加,随降水井与地连墙深度比的增加而减小。地下水初始水头在-2.0~-5.0 m范围内变化时,坑外地表沉降位移受影响较大;在-8.5~-11.0 m范围内变化时,地连墙水平位移受影响较大。地下水初始水头的变化对墙身弯矩影响很大,且接近线性变化,而对坑底隆起变形的影响较小。降水井与地连墙深度比对基坑周边地表沉降位移与地连墙水平位移的影响较大,且接近线性变化,而对坑底隆起位移与墙身弯矩的影响较小。This paper is aimed at exploring the influence of dewatering/precipitationon deep foundation pit engineering.The study involves simulating and analyzing the influence of depth ratio of dewatering well to diaphragm wall,initial groundwater head on the stress and deformation of deep foundation pit based on fluid-solid coupling model and three-dimensional consolidation theory.The results show that the three parameters of the settlement displacement of ground,the horizontal displacement and the bending moment of diaphragm wall all decrease with the descending of the initial groundwater head,and increase with the increasing of depth ratio of dewatering well to diaphragm wall.The uplift displacement of pit bottom increases with the descending of initial groundwater head and decreases with the increasing of depth ratio of dewatering well to diaphragm wall.The ground surface settlement is greatly affected by the changing of the initial groundwater head in the range of-2.0--5.0 m;and the horizontal displacement of the diaphragm wall is greatly affected by the changing of the initial groundwater head in the range of-8.5--11.0 m.The change of initial groundwater head has a great influence on the bending moment of the wall,approaching to the linear,but little influence on the heave deformation of the pit bottom.The depth ratio of dewatering well to diaphragm wall has a great influence on the ground surface settlement and the horizontal displacement of the diaphragm wall,approaching to the linear,and little influence on the heave displacement of pit bottom and the bending moment of wall.

关 键 词：深基坑 流固耦合 降水 三维固结 

分 类 号：TV551[水利工程—水利水电工程]