软粘土地基基坑开挖中双排桩式围护结构的数值分析及应用

Finite Element Analysis and Application of Deep Excavation with Retaining Structure of Double-row Piles in Soft Clay

本文采用平面应变非线性弹性有限单元法，编制了分析双排桩式围护结构的程序，藉此研究了软土地基中双排桩式围护结构的内力和变形特性。文章探讨了桩身刚度、前后排桩排距。被动区土体加固对围护结构内力和变形的影响，得到了双排桩式围护结构设计及施工的一些有益结论。结合一工程实例，数值计算和实测结果较为吻合。

A 2D-Finite Element Program has been developed for analyzing the behavior of retaining structure of double-row piles. The characteristics of intemal force and lateral displacement of this type of retaining structure in soft soils are analyzed. The effects of the rigidity of piles and beams, the properties of soil, the distance between front and back row piles, the strengthening of the passive soil area on int6rnal force and lateral displacement of the retaining strUcture are presented. Finally, taking an engineering project as example, the results of calculation and the field observation have been found to be in good agreement.