变截面井筒式地下连续墙竖向承载性状分析

摘要

As a new type of bridge foundation based on the caisson diaphragm wall,the vertical behavior of the caisson diaphragm wall with variable cross-section is rarely studied.In this paper,a numerical analysis for the caisson diaphragm wall with variable cross-section and the caisson diaphragm walls foundation in the same engineering general situation was conducted by a FLAG3D simulation.And the change rule of the Q-S curve,subsidence characteristics and load share ratio,etc,were also studied as well.Results show the good bearing performance of the caisson diaphragm wall with variable cross-section.The inner skin friction of the vertical behavior of the caisson diaphragm wall with variable cross-section is much larger than the caisson diaphragm wall and it would not be limited.%变截面井筒式地下连续墙是在基于井筒式地下连续墙的基础上提出的一种新型的桥梁基础,其竖向承载性状的研究在国内外尚处于起步阶段.利用FLAG3D模拟相同工程概况下的变截面井筒地下连续墙和井筒式地下连续墙,分析变截面地连墙基础和井筒式地连墙基础Q-S曲线、沉降特性、荷载分担比的变化规律,结果表明:变截面地连墙基础在沉降方面具有较好的性能,而且变截面地连墙内摩阻力得到有效发挥,可以有效降低群墙效应的影响.