Consolidation Calculation Of Super-soft Ground With Vertical Drains

Based on the large strain theory of consolidation, considering the actual situation of the vertical and horizontal radial permeation at the same time, the governing equation of consolidation of Super-Soft Ground with Vertiacl Drains(SSGVD) was developed. The alternating direction implicit method of finite difference method was being adopted to solve the governing equation, and the calculating program is prepared. Under certain conditions, according to Carrillo's theory, consolidation of SSGVD might be decomposed into vertical and horizontal radial consolidation respectively, and the explicit difference method of the upwind scheme was be adopted to solve the two equations, and the calculating programs are prepared too.The advanced instrument of GDS consolidation system, was used to carry out the test of consolidation and permeability on the ShenZhen marine clay, the development gularity of the permeability parameter,compression parameter and the consolidation parameter were studied. The article puts forward the proposal method of determining the parameters of large strain consolidation of SSGVD.The two cases, the waste ponds of U.S.A. Florida phosphate industry and the port of Shenzhen-Hongkong Western Corridor, in which the permeability and compressibility of the soil is subject to the power function or the semi-logarithmic function respectively, are calculated and forecasted by the above methods and the programs. The analytic result demonstrates the correctness and applicability of the proposed method of calculation and the programs.The method of preloading consolidation with vertical drains is the conventional measure for strengthening the super soft ground currently. The large strain consolidation theory was brought into SSGVD, this paper provides a significant attempt on the project.