The ground by partially penetrated sand drain is turned into a equivalent-double-layered ground with the general solution of the average degree of consolidation; and the analytical solution of 1-D consolidation for the underlying soft layer is given; and furthermore the average degree of consolidation is obtained. Based on this solution and the present existed solutions

these relevant programs are programmed. The influence of c and soil property parameters on the consolidation process is investigated; and the relevant results are prepared in graph forms; and the applicabilities of all these solutions are evaluated. It is shown that the solution in this paper fulfills the requirements of project. Especially in the case of PTPB

the curves of Uz-Tv are more actual which drawn by this solution in comparison with the others.