考虑开挖过程椅式双排桩内力及变形分析

Analysis of Internal Force and Deformation of Chair Double Row Piles Considering Excavation Process

椅式双排桩作为一种新型的深基坑支护结构,目前尚无简单而有效的设计方法。本文基于Winkler地基梁基本思想,在忽略桩土竖向摩擦效应及空间效应的条件下,将荷载传递矩阵法与平面杆系结合,构建了椅式双排桩工作性状分析的整体刚度矩阵,编制了相应的Matlab计算程序,并进行了相应的工程计算及影响因素分析。工程计算结果表明,计算位移与监测位移具有较好的一致性,计算内力有较好的规律性和可比性,可供椅式双排桩支护结构设计参考。

As a new type of deep foundation pit supporting structure, there is no simple and effective design method for chair double row piles at present. Based on the basic idea of Winkler foundation beam and ignoring the vertical friction effect and spatial effect of pile-soil, this paper combines the load transfer matrix method with the plane bar system to construct the global stiffness matrix for the performance analysis of chair type double row piles, compiles the corresponding matlab calculation procedure, and carries out the corresponding engineering calculation and the analysis of the influencing factors. The engineering calculation results show that the calculated displacement and the monitored displacement have good consistency, and the calculated internal force has good regularity and comparability, which can be used as reference for the design of chair type double row pile supporting structure.