从非线性连续介质力学出发,采用Jaumann应力率和Biot平面固结理论,用同一程序结构和土性参数计算比较了饱和土体大变形Lagrangian法(TL和UL法)与小变形法的沉降和孔压差异。计算结果表明,当应变较小时,三种方法计算的变形和孔压值相同;当应变很大时,大变形法和小变形法计算的沉降和孔压差异很大。因此,大小变形法分析结果的比较应采用总应力法。文中还指出,大变形分析地基最终沉降小于小变形法,而且时间步长对计算沉降值有严重影响 Based on the nonlinear continuum mechanics, the Jaumann stress rate and the Biot plane consolidation theory are used to calculate and compare the settlement and deformation of the large deformation Lagrangian method (TL and UL method) and the small deformation method of the saturated soil using the same program structure and soil parameters. Difference in pore pressure. The calculation results show that when the strain is small, the deformation and pore pressure values ​​calculated by the three methods are the same; when the strain is large, the settlement and pore pressure calculated by the large deformation method and the small deformation method are greatly different. Therefore, the size of deformation analysis results should be compared with the total stress method. The article also points out that the ultimate settlement of the large deformation analysis foundation is smaller than the small deformation method, and the time step has a serious impact on the calculation of the settlement value