刚性基础下劲性搅拌桩复合地基固结解析解  

Analytical Solution for Consolidation of Composite Ground with Stiffened Deep Cement Mixing Piles under Rigid Foundation

作　　者：杨涛[1] 唐凤[1] YANG Tao TANG Feng(Department of Civil Engineering, University of Shanghai for Science and Technology, Shanghai 200093, Chin)

机构地区：[1]上海理工大学土木工程系,上海200093

出　　处：《防灾减灾工程学报》2016年第4期505-511,共7页Journal of Disaster Prevention and Mitigation Engineering

基　　金：广东省交通科技项目(201102021)资助

摘　　要：根据轴对称固结模型,推导出瞬时加荷刚性基础下劲性搅拌桩复合地基的固结方程,基于双层地基一维固结理论建立了固结解析解。通过与有限元法计算的固结度进行比较,证明了解析解的正确性和有效性。利用建立的固结解析解对劲性搅拌桩复合地基的固结特性进行了分析。结果表明,劲性搅拌桩复合地基的固结速率远大于传统的水泥搅拌桩复合地基,它随芯桩芯长比、劲性搅拌桩置换率和水泥搅拌桩外壳压缩模量的增加而增大,芯桩弹性模量和截面含芯率对劲性搅拌桩复合地基固结速率的影响不大。Based on the axisymmetric consolidation model,the equations governing the consolidation of composite ground with SDCM piles were derived under rigid foundation.The analytical solutions were then developed for the consolidation of the composite ground under an instant loading according to the 1-D consolidation theory of a double-layer ground.In order to verify the correctness and accuracy of the present solutions,comparison of the calculated consolidation rate of the composite ground by the proposed solution and the finite element method was made.The consolidation behavior of this new kind of composite ground was investigated using the proposed analytical solution.The results show that the consolidation rate of the composite ground with SDCM piles is greater than that of the conventional composite ground with DCM piles.It increases with the increasing of the length ratio of the concrete core pile to SDCM pile,the area replacement ratio and the compressive modulus of DCM pile socket.While the elasticity modulus of the core pile and its area core ratio have insignificant influence on consolidation rate of the SDCM pile reinforced soft ground.

关 键 词：劲性搅拌桩复合地基 固结 解析解 芯长比 截面含芯率 

分 类 号：TU473[建筑科学—结构工程]