水平荷载下黄土地基单片地下连续墙现场试验研究

In-situ test study of single diaphragm wall under horizontal loading in loess subgrade

基于墙顶水平荷载作用下黄土地基中单片地下连续墙的现场试验,分析和研究了地下连续墙的水平受力变形特性,得出了在不同荷载作用下墙身各截面弯矩、水平位移及墙侧土抗力等沿墙深的分布规律。结果表明,在水平荷载下墙体上部的1/3段受荷载的影响最为显著,墙身水平位移及转角沿墙深非线性衰减,并随墙顶荷载的增加而增大;墙身弯矩及墙侧土抗力最大值发生在地表以下一定深度范围内,随荷载的增加其最大值及0值点沿墙身逐渐向下迁移,且土抗力-位移曲线呈现双曲线的特征;墙体剪力在地表处最大,沿墙身向下呈非线性变化。

Based on an in-situ test of single diaphragm wall under head horizontal static loading in loess subgrade,the level loading distortion characteristics were analysed and studied,with the increase of head horizontal load,the variation rules along the depth of the different section bending moment,horizontal displacement of diaphragm wall and loess resistance etc.were obtained.The results indicate that the third segment of upside diaphragm wall is influenced distinctly by the head level loading;horizontal displacement and bending angle of diaphragm wall presented nonlinearly decreasing down the depth,and increased with the development of head loading;the maximum values of bending moment of diaphragm wall and loess resistance take place within a range of depth below the earth＇s surface,the position of maximum and zero values of bending moment and loess resistance transferred gradually down along with diaphragm wall that accompanied with the head level load increasing;and curves of loess resistance –horizontal displacement takes on the properties of hyperbola;the maximum shearing force values of diaphragm wall occured on the surface,and shearing force varied nonlinearly down with the diaphragm wall.