中文摘要：

将单个散体材料桩截面和单桩影响范围内的桩周土截面作为一个研究单元考虑，由固结过程中孔隙水排出量等于单元体体积减小量，并引入平均超孔隙水压力的概念，考虑桩体的固结变形，推得散体材料桩复合地基的固结方程。通过等应变假设和初始边界条件，由分离变量法对该固结方程进行求解，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。通过某工程实例计算，将计算结果与已有解析解进行了比较分析。当散体材料桩复合地基的井径比较大时，两者计算结果十分相近；当井径比较小时，两者差别较大。

英文摘要：

The whole cross section of a granular columns and soil around pile were regarded as an element to analyze. According to the equivalent relationship of the seepage discharge to the volumetric change, the equations for the consolidation of composite ground with granular columns were derived using the concept of average excess pore water pressure; and the consolidation deformation of pile was considered. 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 pore water pressure and average percent consolidation of granular pile and its surrounding soil were obtained; and the degree of consolidation of the composite foundation was acquired. Finally, an example was given for calculation and analysis. Results drawn from this paper have been compared with the existing references＇ results; when the diameter ratio of composite ground with granular columns was large, the results are in good agreement; and the diameter ratio was small, the differences come to obvious.