深基坑中新型双排复合支护结构的三维空间有限元分析

将两种或两种以上的支护结构组合成复合支护结构，应用于复杂软土地基深基坑工程已受到许多研究与设计人员的关注，以确保工程的安全、稳定及经济性。针对目前关于将地下连续墙与钻孔灌注桩及高压旋喷桩联合成新型双排复合支护结构的研究较少，本文以某软土深基坑工程为例，设计采用了该新型双排复合支护结构，基于三维弹塑性有限单元法对深基坑工程的分层土体开挖与降水展开数值模拟，通过分析该新型双排复合支护结构的结构性能及深基坑开挖对周围环境的影响，验证设计方案的有效性，为该类型的复合支护结构在深基坑工程中的应用和推广提供有益帮助。 The composite supporting structure which consists of two or more kinds of supporting structures has received much attention from researchers and designers, and has been applied in complex soft-soil deep excavation engineering to ensure the safety, economy, and stability of the engineering. Considering there are few studies on the new-type double-row composite supporting structure which consists of diaphragm wall, bored pile, and high pressure jet grouting pile, we took one soft foundation pit engineering as a case study, and designed the new-type double-row composite supporting structure. Using the three-dimensional elastoplastic finite element method, we conducted numerical simulation of the stratified excavation and precipitation of the engineering. Through the analysis of the structural performance of the new-type double-row composite supporting structure and the influence of excavation on the surrounding environment, we verified the validity of the design. This research can provide help to the application and popularization of the new-type composite supporting structure in deep excavation engineering. 国家重点研发计划课题（2016YFC0401601）;国家自然科学基金项目（51579085;51279052;51379068;51209077; 51379083;51409167;51479054;51579086）；国家自然科学基金重点项目（41323001;51139001）；2014年水文水资源与水利工程科学国家重点实验室研究项目（20145028312）；江苏省“333高层次人才培养工程”科研项目（2016-B1307101）；中央高校基本科研业务费专项资金资助（2015B32514;2015B33314），淮安市水利院士工作站资助；