刚性基础下水泥土桩复合地基固结分析  

Consolidation analysis of cement-pile composite foundation under rigid foundation

作　　者：邢皓枫[1] 杨晓军[1] 龚晓南[1] 

机构地区：[1]浙江大学建筑工程学院

出　　处：《浙江大学学报（工学版）》2006年第3期485-489,共5页Journal of Zhejiang University：Engineering Science

摘　　要：为了掌握刚性基础下水泥土桩复合地基的固结性状,建立了复合地基的固结解析式.根据固结过程中孔隙水排出量等于单元体体积减小量的关系和平均超孔隙水压力的概念,推得水泥土桩复合地基的固结方程.通过等应变假设和初始边界条件,由分离变量法针对该固结方程进行了求解,得到了桩体和桩间土的平均超孔隙水压力、平均固结度、复合地基整体固结度和固结沉降.研究结果表明,该解析式所得的计算结果与有限元分析结果相吻合,且水泥搅拌桩复合地基固结速率大于天然地基固结速率,并与现场观测的水泥土桩复合地基固结度变化趋势一致.To find out the consolidation characters of composite foundation reinforced by cement-piles, an analytical solution to composite foundation was established. According to the equivalent relationship of the seepage discharge to the volumetric change, the equations for the consolidation of cement-pile reinforced foundations were derived using the concept of average excess porewater pressure. Through the initial and boundary conditions of the composite foundation and the assumption of the equal strain, the equations were solved by separation of variables. The average excess porewater pressure and average percent consolidation of cement-pile and its surrounding soil were obtained, and the degree of consolidation of the composite foundation and the consolidation settlement were acquired. The research results indicate that the data calculated by the analytical equation are consistent with those of finite element analysis, that the consolidation rate of composite foundation reinforced by cement-piles is greater than that of the natural foundation, and that the trend of consolidation rate conforms with that of field observation.

关 键 词：水泥土桩 复合地基 孔隙水压力 固结 有限元法 

分 类 号：TU43[建筑科学—岩土工程]