变荷载下劲性搅拌桩复合地基固结分析

发布时间：2018-11-20 05:42

【摘要】：采用劲性搅拌桩加固地基的复合地基技术越来越多地被用于实际工程,而对其固结理论的研究有待深入。基于等应变假定,推导出劲性搅拌桩复合地基在变荷载作用下桩间土的固结方程,采用双层地基一维固结理论求解该固结方程,得到了桩间土中的平均超静孔隙水压力和复合地基整体平均固结度的解析表达式。通过与固结度有限元分析结果的比较,评价了固结度解析表达式的计算精度。利用该固结度解析表达式进行参数分析,研究了劲性搅拌桩复合地基的固结特性。研究结果表明,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,它随着劲性搅拌桩的置换率、芯桩芯长比和水泥土外壳材料压缩模量的增大而增大。芯桩的截面含芯率和压缩模量对复合地基固结速率影响很小。
[Abstract]:The composite foundation technology using stiffened mixing pile to reinforce foundation is more and more used in practical engineering, but the consolidation theory needs to be studied deeply. Based on the assumption of equal strain, the consolidation equation of soil between piles under variable load is derived, and the one-dimensional consolidation theory of double-layer foundation is used to solve the consolidation equation. The analytical expressions of the average excess pore water pressure in the soil between piles and the average consolidation degree of the composite foundation are obtained. The accuracy of the analytical expression of the degree of consolidation is evaluated by comparing with the results of the finite element analysis of the degree of consolidation. The consolidation characteristics of composite foundation with stiffened mixing piles are studied by using the analytical expression of consolidation degree. The results show that the consolidation rate of rigid mixing pile composite foundation is much higher than that of traditional cement mixing pile composite foundation, and it increases with the increase of displacement ratio, core length ratio and compression modulus of cement-soil shell material. The core ratio and compression modulus of the core pile have little effect on the consolidation rate of composite foundation.
【作者单位】：上海理工大学土木工程系;
【基金】：广东省交通科技项目(201102021) 上海理工大学国家级项目培育基金(16HJPY-MSO3)
【分类号】：TU472

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