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刚性基础下水泥土桩复合地基固结分析
引用本文:邢皓枫,杨晓军,龚晓南.刚性基础下水泥土桩复合地基固结分析[J].浙江大学学报(自然科学版 ),2006,40(3):485-489.
作者姓名:邢皓枫  杨晓军  龚晓南
作者单位:邢皓枫(1.浙江大学 建筑工程学院, 浙江 杭州 310027; 2.同济大学 地下建筑与工程系, 上海 200092)
杨晓军(浙江大学 建筑工程学院, 浙江 杭州 310027)
龚晓南(浙江大学 建筑工程学院, 浙江 杭州 310027)
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.

关 键 词:水泥土桩  复合地基  孔隙水压力  固结  有限元法
文章编号:1008-973X(2006)03-0485-05
收稿时间:2005-03-19
修稿时间:2005年3月19日

Consolidation analysis of cement-pile composite foundation under rigid foundation
XING Hao-feng,YANG Xiao-jun,GONG Xiao-nan.Consolidation analysis of cement-pile composite foundation under rigid foundation[J].Journal of Zhejiang University(Engineering Science),2006,40(3):485-489.
Authors:XING Hao-feng  YANG Xiao-jun  GONG Xiao-nan
Affiliation:1. College of Civil Engineering, Zhejiang University, Hangzhou 310027, China; 2 Department of Geotechnical Engineering , Tongji University, Shanghai 200092, China
Abstract: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.
Keywords:cement pile  composite foundation  pore water pressure  consolidation  finite element method
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