Analytical solution for consolidation of composite ground with stone columns considering the time dependent well resistance

Abstract:

Aiming at the well resistance during the consolidation process of composite ground with stone columns in practical engineering, the causes of well resistance and the time and space effect under variable well resistance condition were analyzed. The equations for the consolidation of composite ground considering time effect of well resistance were established by analytical method. Based on the variation of permeability coefficient of the stone column, two types of functions which describe the relationship between permeability coefficient and time were built and the general analytical solutions are derived under the specific variation modes for the consolidation problem of the composite foundation with stone columns. The results show that the variation of well resistance has obvious influence on the consolidation rate of the composite ground with stone columns. Compared with the existing theories, the results of this paper are more reasonable. In addition, the larger the initial value of well resistance factor, the severer the influence of the time effect of well resistance. In order to accelerate the consolidation of the composite ground, it is more efficient to improve the permeability rather than the modulus of stone columns under the same conditions.