考虑施工过程的土层锚杆挡土桩共同作用的非线性分析

A NONLINEAR ANALYSIS OF COMBINED ACTIONS OF SOIL ANCHORS AND EARTH-RETAINING PILE WALL IN CONSIDERATION OF CONSTRUCTION STEPS

根据基坑开挖的施工过程,对每一个开挖步骤,利用锚杆和挡土桩交点变形协调关系建立协调方程组;对锚杆的P-s曲线用最小二乘法进行多项式拟合,得到非线性的回归函数,并将其代入变形协调方程组,用不动点迭代法编程求解,得到每个开挖过程锚杆的内力和位移值。将不同施工过程的同一点的所有变形值累加,即得到了该点在开挖结束后的最终变形。

Considering construction steps, to every step, nonlinear equations are proposed according to the compatibility of deformation of the intersection point between soil anchors and earth-retaining pile wall. Multinomial fitting of P - s curve are figured out with the method of the least squares, then the nonlinear regression function is gained, which is put into the nonlinear equations and solved through fixed point iterative program. The force and displacement of every construction step can be obtained. By summation of the displacements of the same point for different construction steps, the eventual displacement can be got.