深埋车站条形基础地基承载力计算及方法探讨  

Study on Calculation Method of Bearing Capacity of Strip Foundation with Large Depth

作　　者：刘力[1] 

机构地区：[1]北京市市政工程设计研究总院有限公司,100082

出　　处：《特种结构》2014年第1期83-87,共5页Special Structures

摘　　要：对于北京地区采用"PBA"工法修建的暗挖地铁车站,当顶板覆土厚度达到10m甚至更大,且中柱和边桩下条基处于粉土和粉质粘土中时,根据北京地基规范^([3])对深埋中条基、边条基采用不同的地基承载力修正计算方法,此时往往面临条基地基承载力不足的难题。本文通过数值计算方法的深埋条基地基承载力结果与规范公式计算结果进行对比,分析了规范对深埋中条基、边条基地基承载力深度修正计算方法的不足。从地基承载力深度修正机理出发,数值计算结果表明,"PBA"工法中条基、边条基由于相邻条基上荷载作用,对条基地基承载力有明显的提高作用,而规范公式中并未体现该规律,根据本文的研究结果,现有规范对"PBA"工法中条基、边条基地基承载力的修正计算方法需要进行改进。There are many subway stations constructed by the ＂PBA＂ method in Beijing, the thickness of the covering soil above the roof of the station is sometimes larger than 10 meters, especially bearing capacity of foundation of silt soil is a problem needs to be solved. The standard considers the foundation bearing capacity correction of width and depth, and the calculated results of bearing capacity of the foundation soil are usually inadequate. The result of deep foundation bearing capacity of numerical analysis is lager than result of the standard. Based on the mechanism of foundation bearing capacity depth correction, the load on the beside foundation can increase the bearing capacity of the foundation, while, the standard ignored this phenomenon.

关 键 词：地基承载力 基础埋深 深度修正 荷载沉降曲线 

分 类 号：U231.1[交通运输工程—道路与铁道工程]