T型地下连续墙基坑支护特性研究  

Research on Foundation Pit Supporting Characteristics of T-shaped Underground Diaphragm Wall

作　　者：赵永祥 于方正 朱荣辉 ZHAO Yongxiang;YU Fangzheng;ZHU Ronghui(China First Highway Engineering Group Co.,Ltd.,Beijing 100024,China)

机构地区：[1]中交一公局集团有限公司,北京100024

出　　处：《路基工程》2024年第3期107-111,共5页Subgrade Engineering

基　　金：中交一公局集团有限公司A级科研项目(KJYF-2021-A-05)。

摘　　要：通过对T型地下连续墙受力及支护特征研究分析,结合等效刚度原理,采用弹性地基梁法对墙体内力及位移进行推导;采用理论计算、数值分析等方法,建立T型地下连续墙基坑支护三维有限元模型,分析基坑开挖过程中不同开挖深度及不同截面处的墙体水平位移、墙后地表沉降规律。结果表明:采用T型地下连续墙进行基坑支护时,墙边至肋端外侧1/3~1/2肋长范围土体变形受墙肋影响较大;T型地下连续墙对于较大开挖深度能够更早起到支护作用,对于较小的开挖深度作用有限;墙厚增加将降低墙体变形,但在一定开挖深度下,存在最优墙厚,在满足基坑变形要求的前提下,可适当减小墙厚,以提高工程经济性。The stress and supporting characteristics of T-shaped underground diaphragm wall are studied and analyzed.The internal force and displacement of the wall are deduced by elastic foundation beam method combined with the principle of equivalent stiffness.Through using theoretical calculation,numerical analysis and other methods,the threedimensional finite element model of T-shaped underground diaphragm wall foundation pit support was established to analyze the horizontal displacement of the wall and the settlement law of the ground behind the wall at different excavation depths and different sections during the foundation pit excavation.The results show the soil deformation in the 1/3~1/2 rib length range from the wall side to the outer rib end is greatly affected by the wall rib in the case of using Tshaped underground diaphragm wall for foundation pit supporting.However,under a certain excavation depth,there is an optimalwall thickness.Under the premise of meeting the deformation requirements of foundation pit,the wall thickness can be appropriately reduced to improve the engineering economy.

关 键 词：T型地下连续墙 基坑支护 理论计算 墙体水平位移 地表沉降 支护特性 

分 类 号：TU459.5[建筑科学—岩土工程]