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采用比奥固结理论，考虑侧向变形、二维或三维渗流对沉降的影响，对沪宁高速公路路基作非线性有限元计算。将路堤和地基作为整体划分网格，取网格结点上的孔隙压力和竖向、水平向的位移为基本未知量，在路堤作用下，根据土体的劲度和渗透性建立方程组，从而解得孔压和位移。由有限元法与常规设计计算结果比较可知：用ｅ～ｌｇｐ′法考虑前期固结压力是必要的，但应用１０～１２的修正系数对总沉降作修正；有限元法算得的工后沉降小于分层总和法；路堤填筑速度对沉降过程有影响；增加预压时间可减少工后沉降。
Using Biot consolidation theory, considering the influence of lateral deformation, two-dimensional or three-dimensional seepage on settlement, the nonlinear finite element calculation of Shanghai-Nanjing Expressway subgrade is taken. The embankment and foundation are divided into grids as a whole. Taking the pore pressure and the vertical and horizontal displacements at the grid nodes as the basic unknowns, the equations are established according to the stiffness and permeability of the soil under the action of the embankment, Thus solving pore pressure and displacement. From the comparison between the finite element method and the conventional design, we can see that it is necessary to consider the pre-consolidation pressure with e ~ lgp ’method, but the correction coefficient of 10 ~ 12 is used to correct the total settlement. The finite element method Post-construction settlement is less than the sum of stratification method; embankment filling speed has an impact on the settlement process; increasing the pre-pressure time can reduce post-construction settlement.