变荷载下任意层地基一维非线性固结的数值分析

Numerical Analysis of One Dimensional Nonlinear Consolidation of Layered Foundation under Time Dependent Loading

采用双曲线型的土体应力应变关系和渗透系数k随孔隙比变化的关系式,不对固结系数作任何假设,建立了考虑荷载变化的任意层地基的一维非线性固结控制方程,并用简化加权隐式差分格式对上述非线性固结控制方程进行数值计算。以某四层地基为例,通过与太沙基线性固结理论的比较,揭示了非线性因素对饱和成层软土地基一维固结的影响及通常情况下考虑非线性因素影响的必要性。

Without any hypothesis on consolidation coefficient for a certain soil layer, considering the loads variety, the one-dimensional nonlinear consolidation control equation is built up by using hyperbolic stress-strain relationship of soil, and the relation of permeable coefficient k which goes with the change of void ratio. Furthermore, taking four-layers from the soft clay foundation as an example and using a simplified weighted implicit difference format, numerical results of nonlinear consolidation control equation are calculated. By comparing the calculated results with the data calculated by Terzaghi linear consolidation theory, the results demonstrate that the influence of nonlinear factors on one-dimensional consolidation behaviors of soft-soil foundation is very complicated and generally the effect of nonlinear factors shouldn＇t be ignored.