双层散体材料桩复合地基固结理论

Analytical theory for consolidation of double-layered composite ground with granular columns

研究了考虑涂抹效应和应力集中效应的双层散体材料桩复合地基固结解析解及其工程应用,分不同情况讨论了特征根的可能变化规律,也讨论了解析解转化为双层竖井地基以及双层天然地基的普遍适用性。研究发现,固结速率随井径比的减小、水平向渗透系数比的增大和桩体刚度的增大而增加;底面排水条件对双层散体材料桩复合地基的固结影响,在井径比不是很大的情况下影响不大;是否考虑应力集中效应对计算结果影响较大。

This paper mainly carried out analytical theory for consolidation and its engineering performance of double-layered composite ground with granular columns considering smear effects and stress concentration effects, and discussed possible variational laws considering different cases, also with the common applicability of this analytical theory. Conclusions were made that speed of consolidation depended on drain ratio and horizontal coefficient of permeability and stiffness of pile; draining of bottom did not have efficient influence on consolidation with small drain spacing ratio, whether considering stress concentration effects or not had efficient influence on consolidation.