中南大学学报(英文版)
中南大學學報(英文版)
중남대학학보(영문판)
JOURNAL OF CENTRAL SOUTH UNIVERSITY OF TECHNOLOGY(ENGLISH EDITION)
2015年
7期
2699-2706
,共8页
龚晓南%田效军%胡文韬
龔曉南%田效軍%鬍文韜
공효남%전효군%호문도
axisymmetric consolidation model%floating soil-cement column%consolidation%depth-dependent ramp load%analytical solution
A simplified method is presented for predicting consolidation settlement of soft ground improved by floating soil?cement column on the basis of double soil-layer consolidation theory. Combining the axisymmetric consolidation model and equal strain assumption, the governing equation was derived for the consolidation of clayey subsoil reinforced by soil?cement column. By modifying the boundary condition of the interface between the improved layer and underlying layer on seepage and pore-water pressure, the analytical solution of consolidation of soft ground improved by floating soil?cement column was developed under depth-dependent ramp load. The results of the parameter analysis of consolidation behavior show that the consolidation rate is closely related with the depth replacement ratio by the column and the permeability of upper layer. The influence of column?soil constrained modulus ratio and radius ratio of the influence zone to the column on consolidation is also affected by depth replacement ratio. The column?soil total stress ratio increases with time and approaches the final value accompanied with the dissipation of excess pore water pressure.