黏性土中条壁式地连墙基础竖向承载特性研究  

Vertical bearing characteristics of foundation with barrette diaphragm wall in cohesive soils

作　　者：邓会元 王仁贵[1] 宋二祥[2] 黄李骥[1] 刘晓东[1] 刘波[1] DENG Huiyuan;WANG Rengui;SONG Erxiang;HUANG Liji;LIU Xiaodong;LIU Bo(CCCC Highway Consultants Co.,Ltd.,Beijing 100010,China;Department of Civil Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]中交公路规划设计院有限公司,北京100010 [2]清华大学土木工程系,北京100084

出　　处：《岩土工程学报》2024年第S02期200-204,共5页Chinese Journal of Geotechnical Engineering

基　　金：中交集团重大科技研发项目(2021-ZJKJ-07);中交公路规划设计院有限公司科技研发项目(C22052B)。

摘　　要：条壁式地连墙基础长宽比较大,承载性能优越,施工速度快捷,具有较好工程应用前景。但其承载机理尚不明晰,通过建立条壁式地连墙基础数值模型,研究了条壁式地连墙基础竖向承载特性及墙-土相互作用机理,分析了墙体参数、土体参数等因素对条壁式地连墙基础竖向承载力的影响。计算结果表明,单幅地连墙每增加10 m埋深可使承载力提高34%~60%。每增加12 m墙长度可使承载力提高14%~89%。地连墙承载力随土体黏聚力和内摩擦角增加而基本呈线性增长,随土体弹性模量增加而呈对数增长。当墙顶荷载接近极限时,墙端附近形成一个锥形的潜在滑移面。地连墙长度越长,地连墙对周围土体影响范围越来越大,墙幅间对周围土体影响存在叠加效应。The barrette diaphragm wall has a large aspect ratio,superior load-bearing performance,fast construction speed and good engineering application prospects.However,its bearing mechanism is not yet clear.By establishing a numerical model for the foundation with the barrette diaphragm wall,the vertical bearing characteristics and the wall-soil interaction mechanism are studied.The influences of wall parameters,soil parameters and other factors on the vertical bearing capacity of the barrette diaphragm wall are analyzed.The calculated results show that increasing the burial depth of a single diaphragm wall by 10 m can increase the bearing capacity by 34%to 60%.An increase of 12 m in the wall length can increase the bearing capacity by 14%to 89%.The bearing capacity of the diaphragm wall increases linearly with the increase of cohesion and internal friction angle of the soils,and logarithmically with the increase of elastic modulus of soils.When the load on the top of the wall approaches its limit,a potential conical sliding surface forms near the wall base.The longer the length of the diaphragm wall,the greater the impact of the diaphragm wall on the surrounding soils,and there are superimposed effects between the wall amplitudes on the surrounding soils.

关 键 词：条壁式地连墙 竖向承载力 数值分析 墙-土相互作用机理 滑移面 

分 类 号：TU473[建筑科学—结构工程]