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针对现有复合地基固结理论仍不能考虑实际工程中存在的初始孔压非均布情况的不足,采用解析方法对散体材料桩复合地基进行深入研究,给出了考虑初始孔压非均布的散体材料桩复合地基固结一般解。探讨了初始孔压非均布的3种特殊情况,导出了初始孔压矩形分布(均布)、正三角形分布和倒三角形分布等情况下的复合地基平均孔压和平均固结度表达式。研究表明:单面排水条件下,初始孔压分布对复合地基固结有显著影响;初始孔压均布和正三角形分布条件下,超静孔压随Tv值的增大而逐渐消散,固结期间地基底部孔压值最大;初始孔压倒三角形和梯形(pB/pT=0.5)分布条件下,Tv值越大,孔压等时线越平缓,且孔压最大值的位置由地基顶部向底部转移,固结过程中底部孔压变化呈现“从小变大、再变小”的特点。
According to the existing consolidation theory of composite foundation, the insufficiency of initial pore pressure non-uniform distribution in practical engineering can not be considered. By using analytical method, the in-depth study of composite foundation with floating material piles is given. The general solution of loose material pile composite foundation consolidation. Three special cases of initial pore pressure non-uniform distribution are discussed, and the expressions of average pore pressure and average consolidation degree of composite foundation are derived under the conditions of initial pore pressure distribution (uniform), equilateral distribution and inverted triangle distribution. The results show that the distribution of initial pore pressure has a significant effect on the consolidation of composite foundation under the condition of single-side drainage. The excess pore pressure gradually dissipates with the increase of Tv under the conditions of initial pore pressure distribution and equilateral triangle distribution. During the consolidation period The pore pressure at the bottom of the foundation is the highest. Under the conditions of pB / pT = 0.5, the higher the Tv, the smoother the pore pressure isochrone and the maximum pore pressure shifts from the top of the foundation to the bottom of the foundation , The bottom of the consolidation process changes in pore pressure showed “from small to large, then smaller ” features.