桩-桶基础的结构试验及数值模拟  

Indoor Experimental Study and Numerical Simulation on the Pile-bucket Foundation under Uplift Loading

作　　者：刘文白[1] 李小强[1] 

机构地区：[1]上海海事大学海洋环境与工程学院,上海201036

出　　处：《地下空间与工程学报》2009年第A02期1525-1529,1536,共6页Chinese Journal of Underground Space and Engineering

基　　金：上海市教育委员会科研项目资助(07ZZ99);重点学科建设项目(2009445878);浙江省科技计划面上项目(2008C23023)

摘　　要：通过室内模型试验和有限元数值模拟研究了上拔荷载作用下桩-桶基础结构内力分布,将试验数据和数值模拟结果进行对比分析。上拔荷载达到极限时,基础应力及变形达到最大,土体破坏后,桩-桶结构各部分的受力趋于稳定;桶壁及桩身从上到小,受力逐渐减小;桩和桶的结合部位及桶顶边缘处,所受应力较大;上拔过程中,桶底和桩底会出现空腔,导致应力较最大应力分别减小8.6%和13.5%;上拔过程的第9级荷载步之前,由桩承担主要的抗力作用,第9级荷载步之后,由桶承担主要的抗力作用。上拔荷载作用下桩-桶基础结构的内力分析对其理论研究及工程实践具有指导作用。The pile - bucket foundation is a new kind of foundation. In this work an indoor model experiment was carried out and the ABAQUS software was used to analyze the structure stress and strain of the pile - bucket foundation under uplift loading. In this work the indoor model experiment operation was designed and the tentative data were analyzed, with the ABAQUS software to establish the model of pile - bucket foundation and the conclusions were analyzed. The experimental results and the numerical simulation results have been compared. The results demonstra- ted that the structure stress and strain reached the maximum when the uplift loading reached the limit, the pile - bucket structure stress tended to be stable after the foundation soil destructed ; the stress at the connection of the pile and the bucket and at the edge of the bucket was bigger than that in other areas ; in the process of uplift, there would appear the cavity at the bottom of the bucket and the pile causing the stress reduction by 8.6% and 13.5% respec- tively; the pile structure took the main resisting force before load step -9 and the bucket structure took the main resisting force after load step - 9. The mechanical analysis of the pile - bucket foundation under uplift loading was ben- eficial to the theoretical analysis and project practice.

关 键 词：上拔荷载 桩-桶基础 模型试验 结构内力 数值模拟 

分 类 号：TV92[水利工程—水利水电工程] TU473.1[建筑科学—结构工程]