深基坑双排桩结构合理支护参数的研究  

OPTIMIZED PARAMETERS OF A DOUBLE-ROW PILES RETAINING STRUCTURE FOR DEEP EXCAVATION OF FOUNDATION

作　　者：聂庆科[1] 吴刚[2] 胡建敏[1] 王英辉[1] 

机构地区：[1]河北建设勘察研究院有限公司,石家庄050031 [2]北京交通大学土木建筑工程学院,北京100044

出　　处：《工业建筑》2008年第z1期656-660,共5页Industrial Construction

摘　　要：结合工程实例,利用FLAC3D数值差分计算程序对深基坑双排桩支护结构上的截面弯矩和变形分布特征进行研究。重点分析双排桩的排距、桩长和桩径等的变化因素的影响,提出优化的设计参数。研究表明:随排距的增加,前后排桩桩体的位移不断减小,但是当排距超过1200 mm时,位移减小的趋势减缓;桩长的增大可使桩顶水平位移减小,而前排桩桩长的变化比后排桩桩长的变化有更大的影响;当桩径较小时,适当增大桩径能有效地减小桩体的位移。Using the finite difference procedure of FLAC^(3D) to study the bending moment and deformation distributions applied on a double-row piles retaining structure in deep excavation process of a deep foundation.The effect of the distance between the two-row piles of a double-row piles retaining structure,change in the length and diameter of the piles,etc are emphasized,and furthermore,the optimized design parameters are proposed.The studies show that the deformations of two-row piles decrease with the increase of the distance between two rows,however,when the distance is greater than 1 200 mm,the trends become slow.The horizontal deformations decrease with the increase of pile length and the variation in pile length of the front row piles are more obvious than the one of the back row piles.

关 键 词：深基坑 支护结构 数值分析 变形 

分 类 号：TU473.1[建筑科学—结构工程]