软土地基螺旋桩竖向抗拔极限承载力计算方法  

CALCULATION METHOD OF ULTIMATE BEARING CAPACITY OF VERTICAL PULL-OUT SCREW PILE IN SOFT GROUND

作　　者：董天文[1] 李士伟[2] 张亚军[2] 黄连壮 

机构地区：[1]辽宁省交通高等专科学校,辽宁沈阳110122 [2]东北大学,辽宁沈阳110004 [3]辽宁省电力勘测设计院,辽宁沈阳110016

出　　处：《岩石力学与工程学报》2009年第A01期3057-3062,共6页Chinese Journal of Rock Mechanics and Engineering

基　　金：沈阳市科技攻关项目(1041023-4-02)

摘　　要：根据抗拔螺旋桩基础竖向抗拔承载性状,使用极限平衡理论和Meyerhof深基础承载力理论,提出抗拔螺旋桩基础首层叶片界限埋深和叶片控制间距,给出多层叶片螺旋桩基础竖向抗拔破坏模式,得到竖向抗拔螺旋桩基础的首层叶片界限埋深和极限承载力计算公式。通过对14次工程桩试验分析和极限承载力计算,竖向抗拔极限承载力计算值与实测值误差一般在10%以内,说明所建立的螺旋桩基础抗拔破坏模式比较接近于实际情况,极限承载力计算方法可用于估算螺旋桩基础的承载力。Based on the bearing capacity characteristics of vertical pull-out screw pile foundation, the limiting embedded depth of first layer lamina（LED） and the limiting space between of laminas（LSB） are proposed according to Meyerhof bearing capacity theory of deep foundation and limiting equilibrium mechanics. The pull-out failure model of multi-layered screw pile foundation is obtained, and the calculation methods of first LED, the conditional estimation of LSB and the ultimate pull-out beating capacity of the vertical pull-out screw pile foundation are presented. On the basis of the analysis and the calculated bearing capacity of 14 times vertical pull-out field tests of screw pile foundation, the calculation mistakes of ultimate pull-out bearing capacity of screw pile foundation are less than 10% for the comparing the calculation values to the estimated values of 3 types of screw pile. It shows that the failure model of screw pile foundation is close to the practical situation, and the calculation method can be used to estimate the ultimate bearing capacity of screw pile foundations.

关 键 词：桩基工程 螺旋桩基础 极限平衡理论 极限承载力 抗拔试验 

分 类 号：TU473[建筑科学—结构工程]