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

An analytical theory for consolidation of double layered composite ground with granular columns considering the stress concentration effects is presented, and the orthogonal relation of double layered system of such ground is obtained. A lot of calculations are performed based on the solutions and the corresponding results are introduced diagrammatically, from which the consolidation characteristics of composite ground are investigated and discussed. The geometric parameters and modulus of compressibility of granular column have great influence on the consolidation process. The average consolidation degrees defined by excess pore water pressure and settlement respectively are different to some extent. The consolidation degree calculated by the existent theory is smaller than that calculated by the proposed theory in this paper.