基于水平受荷桩p-y曲线的桩锚支护结构位移分析

Displacement analysis of pile-anchor retaining structure based on p-y curve of horizontally loaded pile

基于位移控制的深基坑支护结构设计方法已经被广泛采用,为了更准确地计算出围护桩的水平位移,本文引入水平受荷桩的p-y曲线模型,推导得出水平反力系数ks与基坑开挖深度和围护桩水平位移的关系,结合土体与围护桩共同变形的挠曲线方程,建立差分方程,并编写Matlab计算程序,通过编程解得围护桩的水平位移。通过实例分析,将编程计算位移与有限元分析软件分析得到的位移以及实测相比较,本文方法所算得的位移更符合实际情况。

The design method of deep foundation pit retaining structure based on displacement control has been widely used. In order to calculate the horizontal displacement of retaining pile more accurately, the p-y curve model of horizontally loaded pile is introducesd, the horizontal reaction coefficient k_s and the relationship with the excavation depth of the foundation pit and the horizontal displacement of the retaining pile are derived. Combined with the deflection curve equation of the common deformation of the soil and the retaining pile, the difference equation is established, and the Matlab calculation program is accomplished to solve the horizontal displacement of the retaining pile through programming. Through the example analysis, the programmed displacement is compared with the displacement obtained by the finite element analysis software and the measured displacement, the displacement calculated by the method is more in line with the actual situation.