刚性桩长变化对CM复合地基工作性状影响  

Influence of Rigid Pile Length on Working Characteristics of CM Composite Foundation

作　　者：徐新星 张季超[2] 

机构地区：[1]广州市白云区建设工程质量安全监督站,广州510405 [2]广州大学土木工程学院,广州510006

出　　处：《地下空间与工程学报》2018年第1期124-130,共7页Chinese Journal of Underground Space and Engineering

基　　金：国家重点基础研究发展计划资助(973项目)(2011CB013606)

摘　　要：在CM复合地基中,刚性桩起到将荷载传递到深层较好的土层,充分调动发挥各土层的承载能力的作用。本文基于某实际工程,利用ABAQUS软件建立计算模型,对刚性桩桩长在一定范围内变化对CM复合地基整体工作性能的影响进行分析研究,得出荷载变化时刚性桩桩长变化对刚性—亚刚性桩复合地基的沉降变化影响规律,以及对500 k Pa荷载作用下对桩身轴力的影响规律,对荷载变化时对刚性桩、亚刚性桩的桩顶应力的影响规律,在荷载变化和500 k Pa荷载作用下对刚性桩、亚刚性桩和桩间土的荷载分担比的影响规律,以及对复合地基位移场变化的影响规律,可为相关工程设计与实践提供参考。In the CM composite foundation,the rigid pile plays the role of conveying the load to the deep soil layer,and fully mobilizes the bearing capacity of the soil layer. Based on a practical project,the ABAQUS software is used to establish the calculation model. The influence of the change of the length of the rigid pile on the overall working performance of the CM composite foundation is analyzed and studied. The results show that the stiffness of pile influences the settlement variation of rigid-semirigid pile composite foundation,and the effect of 500 k Pa load on the axial force of pile body. The influence of load on the pile top stress of rigid pile and sub-rigid pile is studied.Under the load change and 500 k Pa load,the influence of the load sharing ratio between the rigid pile and the semirigid pile,and the displacement field of the composite foundation. The results can be used as reference for the relevant engineering design and practice.

关 键 词：刚性-亚刚性桩复合地基 桩长变化 工作性状 影响 

分 类 号：TU470[建筑科学—结构工程]