井筒式地下连续墙水平承载能力模型试验研究

井筒式地下连续墙利用构造接头把地下连续墙段连接成一个平面为封闭形状挡土结构,其刚度大,承载力高。由于基础内部含有大面积的土芯,存在墙内土芯、墙体以及外部土体的相互作用。采用水平单向单循环维持荷载法,通过3个不同截面尺寸的单孔闭合墙水平静载试验,研究闭合地下连续墙基础的水平承载特性。基于墙身内力及位移测试结果,研究了井筒式地下连续墙基础在水平荷载作用下的承载机理,分析了水平荷载-位移特性、墙身位移、墙身弯矩、剪力、转角随深度的分布规律。试验结果表明,闭合墙基础呈整体倾斜破坏特性,墙身弯矩随墙深呈非线性变化,墙身剪力在加载处最大,在墙身弯矩极大值处墙身剪力为0,0点以下,墙身剪力随深度呈"大肚形"变化,并且闭合墙的承载力随着闭合墙边长的增大,深度的提高而提高。

Model test research on horizontal bearing capacity of closed diaphragm wall

Closed diaphragm wall foundation is a new type foundation which is constructed by connecting wall elements into a closed shape with structural connector.It has great stiffness and high bearing capacity.For its large soil core,there is interaction among soil core,walls and external soil.Based on lateral one-way loop load maintaining tests on three single chamber model walls with different sizes,the bearing characteristics of closed diaphragm wall foundation are studied.Base on the results of internal forces ...