大直径环梁支护下深基坑开挖的数值分析-港工技术.PDFVIP

大直径环梁支护下深基坑开挖的数值分析 苗 笛 （天津港南港港务有限公司，天津 300280） 摘要：深基坑开挖必然会引起支护结构及周围土体的变形，而大多数深基坑工程都位于城市繁华地段，必须保证基坑和周边 环境的安全。本文结合天津地区某深基坑工程实例，使用有限元分析软件 ABAQUS 对该深基坑开挖进行了数值模拟。分析 时选用摩尔-库伦土体本构模型，并考虑了深基坑分步开挖，逐级加撑和围护桩与土体的相互作用，计算出了深基坑开挖过 程中支护结构的变形、基坑周围土体变形及坑底变形。将数值模拟结果与现场实测数据进行了对比分析，讨论了深基坑开挖 过程中支护结构及土体的变形规律。得出一些对深基坑工程设计和施工有实际意义的结论，可为今后类似的工程提供一定的 借鉴。 关键字：基坑开挖；环梁支护；ABAQUS ；数值模拟 +2 文献标识码:A 文章编号：1004-9592（2015）01-0075-05 中图分类号：TV551.4 DOI: 10.16403/j.cnki.ggj Numerical Analysis of Deep Excavation With Large Diameter Ring Beam Supporting Miao Di (Tianjin Nangang Port Co., Ltd., Tianjin 300280,China) Abstract: Deep excavation is bound to cause deformation of supporting structure and surrounding soil, most deep excavation projects are located in downtown area, so the safety of the pit and surrounding environment must be guaranteed. In this paper, a deep excavation example in Tianjin is simulated by ABAQUS. Mohr - Coulomb model is selected. Foundation excavation and support adding are conducted step by step. Interaction between the pile and the soil is also considered. The deformation of supporting structure, surrounding soil and Bottom soil are calculated. The results were compared with field data and deformation regulation of supporting structure and soil is analyzed. Some meaningful conclusions the paper obtain can provide a reference for future similar projects. Key words: foundation excavation; ring beam supporting; ABAQUS; numerical simulation 常都会导致基坑周围地表的不均匀沉降，当沉降值 引 言 较大时会危及周围既有建筑物或构筑物的安全。这 随着人们对基坑工程问题的认识不断深入，基 一问题在城市基坑工程的施工建设中尤其突出。大 坑工程的三维空间性状日益受到关注。基坑开挖通