针对二维饱和多孔介质流固耦合渗流数学模型，编制全隐式有限差分计算程序，并以二维有限区域饱和软土层地面沉降变形问题为例，探讨上下表面及加载区域边界透水性的影响.选取4种不同边界条件组合，就均布恒载和周期载荷两种情形分别进行计算分析.结果表明:不论是均布恒载还是周期载荷，其最终沉降量与载荷及土体本身性质有关，与边界条件无关，但不同的边界条件所对应的沉降过程各不相同；随边界透水性逐渐变差，超静水压消散效应减弱，拖拽效应增强；周期载荷的频率不影响变形幅值，但影响孔隙水压力的变化幅值，周期载荷的频率越高，孔隙水压力的幅值越大.

The finite difference method and program for 2D flowdeformation coupling model in saturated porous  media is developed. With land subsidence due to loading within a finite 2D soil layer as examples, four cases are studied with upper and lower surfaces pervious or impervious. Deformation and flow under uniform loading and cyclic loading are  calculated respectively. The results show that, whether for uniform or cyclic loading, the final subsidence is dependent on  the loading and the soil property parameters, but independent of boundary conditions. Although boundary conditions have no effect upon the final settlement, consolidation and settlement processes corresponding to various boundary conditions aredifferent from each other. As the boundaries become less permeable, the effect of pore pressure dissipation gets weaker,while the dragging effect is enhanced. For cyclic loading, deformation amplification is independent of the loading frequency, while the pore pressure response becomes stronger as the loading frequency becomes higher.