软土深基坑降水开挖变形分析  

Deformation Analysis of Dewatering Excavation of Deep Foundation Pit in Soft Soil

作　　者：赵逸博 郑晓东[1] 李斌[2,3,4,5] 付建宝 阮浩东[1,2] 沈一鸣 ZHAO Yibo;ZHENG Xiaodong;LI Bin;FU Jianbao;RUAN Haodong;SHEN Yiming(School of Water Resources and Hydropower of Hebei University of Engineering,Handan 056001,China;CCCC Tianjin Harbor Engineering Research Institute Co.,Ltd.,Tianjin 300222,China;CCCC First Navigation Engineering Bureau Co.,Ltd.,Tianjin 300461,China;Key Laboratory of Port Geotechnical Engineering Technology and Transportation Industry,Tianjin 300222,China;Key Laboratory of Port Geotechnical Engineering Technology in Tianjin,Tianjin 300073,China)

机构地区：[1]河北工程大学水利水电学院,河北邯郸056001 [2]中交天津港湾工程研究院有限公司,天津300222 [3]中交第一航务工程局有限公司,天津300461 [4]港口岩土工程技术交通运输行业重点实验室,天津300222 [5]天津市港口岩土工程技术重点实验室,天津300073

出　　处：《河南科技》2024年第5期47-52,共6页Henan Science and Technology

基　　金：博士后专项基金项目(SJ200100105);国家重点实验室项目(2019KFKT-15);河北省自然科学基金(E2020402087);河北省水利科研与推广计划项目(2020-11)。

摘　　要：【目的】研究软土深基坑降水与开挖对支护结构及周边环境的影响。【方法】以深圳某地铁深基坑工程为例,运用ABAQUS有限元软件建立三维基坑模型,分析深基坑降水与开挖对支护结构、临近地表与建筑物沉降变形的影响,同时将监测数据与模拟结果进行对比分析。【结果】结果表明:地下连续墙水平变形呈抛物线形,基坑中部水平位移变形较大,底部位移变形小;临近地表沉降位移呈现先增大后减小的趋势,地表与建筑物沉降变形均在控制范围内;基坑开挖后中部支撑轴力最大,基坑开挖变形结果与实际监测值一致。【结论】通过分析基坑变形规律,为今后软土深基坑降水及开挖研究提供参考。[Purposes]This paper aims to study the impact of dewatering and excavation on the support structure and surrounding environment of soft soil deep foundation pits.[Methods]Based on a subway deep foundation pit project in Shenzhen,a three-dimensional foundation pit model was established using ABAQUS finite element software to analyze the impact of dewatering and excavation on the settlement and deformation of the support structure,adjacent surface and buildings.At the same time,monitoring data and simulation results were compared and analyzed.[Findings]The results show that the horizontal deformation of the slurry wall is parabolic,the horizontal displacement in the middle of the foundation pit is large,and the bottom displacement is small;the settlement displacement near the surface shows a trend of first increasing and then decreasing,and the settlement deformation of both the surface and buildings is within the control range;After the excavation of the foundation pit,the axial force of the middle support is the highest,and the deformation results of the excavation are consistent with the actual monitoring values.[Conclusions]By analyzing the deformation law of foundation pits,reference is provided for future research on dewatering and excavation of soft soil deep foundation pits.

关 键 词：深基坑工程 流固耦合 支护结构变形 地表沉降 

分 类 号：TU941[建筑科学—建筑技术科学]