下卧碎石层对静压管桩挤土效应的影响  

Influence of Underlying Crushed Rock Layer on Compacting Effect of Jacked Pipe Pile

作　　者：王仕传[1,2] 张衍[2] 凌建明[1] 邵艳[2] 

机构地区：[1]同济大学道路与交通工程教育部重点实验室,上海201804 [2]安徽建筑大学土木工程学院,安徽合肥230601

出　　处：《同济大学学报（自然科学版）》2014年第9期1321-1324,1466,共5页Journal of Tongji University:Natural Science

基　　金：安徽高校省级自然科学研究重点项目(KJ2012A053)

摘　　要：利用通用有限元软件ABAQUS分析软土地基下卧碎石层对静压管桩挤土效应和承载力的影响,并探讨管桩不同贯入深度时地表竖向隆起、地基土体水平位移、桩周土体和桩身应力的变化规律.结果表明:静压管桩施工导致桩周附近地表隆起,随着离开桩周的距离增大,地表隆起效应迅速减弱;静压管桩使桩周土体产生显著的水平挤压效应,静压管桩施工至下卧碎石层时,碎石区域中的位移效应明显小于桩周土体为软土时的位移效应;以碎石层为持力层,可显著提高管桩的承载力.Influence of underlying crushed rock on compacting effects and bearing capacity of jacked pipe pile was analyzed by general finite element method ABAQUS. Change rules of ground upwarping, ground horizontal displacement, compressive stress of pipe pile and foundation around it were discussed under the condition of different penetration depth of pile. Results show that installation of jacked pipe pile will result in ground upwarping around piles, and as the distance to the pile side is increasing, ground upwarping effect is weakening quickly. Installation of jacked pile will cause remarkable horizontal soil-compacting effect around it. When jacked pipe pile is penetrated into underlying crushed rock, deformation effect of it around pipe pile is obviously weaker than that of soft foundation because stiffness of crushed rock is larger than that of soft foundation. The bearing capacity of pipe pile can be significantly increased, when the crushed rocklayer is as bearing layer.

关 键 词：静压管桩 碎石层 数值分析 位移贯入法 挤土效应 

分 类 号：TU473[建筑科学—结构工程]