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在土中渗流遵循指数形式渗流定律的背景下,考虑实际中的变荷载作用及土体初始有效应力沿深度的线性增加,建立成层软土地基一维非线性固结控制微分方程及求解条件。运用有限差分法获取其数值解并编制相应的计算程序,通过与达西渗流定律下成层地基非线性固结半解析解相对比,验证了该差分解及计算程序的可靠性。最后,结合不同工况下的某四层软土地基一维非线性固结计算实例,分别对土中的超静孔压、按孔压定义的平均固结度以及地基沉降量进行计算分析。
Under the background that the seepage flow in soil follows the exponential law of seepage, considering the actual variable load and the linear increase of initial effective stress along the depth, a one-dimensional nonlinear governing differential equation of layered soft clay ground and the solution condition . The finite difference method is used to obtain the numerical solution and the corresponding calculation program is compiled. By comparing with the semi-analytical solution of nonlinear consolidation of layered soils under the Darcy flow law, the difference solution and the reliability of the calculation program are verified. Finally, combined with one-dimensional nonlinear consolidation calculation example of a four-layer soft soil foundation under different conditions, the over-hole pore pressure in soil, the average consolidation degree according to pore pressure and the settlement of foundation are calculated and analyzed respectively.