分级加荷时饱和土地基的固结分析

ANALYSIS OF THE CONSOLIDATION OF STEPPED LOADED SATURATED SOIL

论述了外荷载分级施加时，饱和土地基一维固结的微分方程及其在给定的边界条件和初始条件下的解析解，分析了土中一点的孔隙水压力的变化规律，提出了分级加荷时地基中一点的固结度的定义方法。

One dimensional consolidation differential equation and its analytic solution in given boundary and initial conditions are discussed in this paper when loading on the surface of soft saturated soil is stepped. The changing characteristics of the pore water pressure at a point are analysed. Results of calculations show that the pore water pressures change not only with the time but also with the loading, and that the dissipation and increase are conducted at the same time during loading. In such a case, the definitions of the mean consolidated degree are put forward according to the foundation settlement and the dissipation of pore water pressure respectively. The values of these two kinds of consolidated degree are not the same except for that the load is constant. Finally, the usual simple method is analysed and evaluated, and the result indicates that the pore water pressures by simple method accord with those by accurate method very well after a long time.