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分别采用弹性和弹塑性有限元分析法对一假想路基进行了分析,通过对两者方法计算结果的对比,探讨了弹性分析法和弹塑性分析法在路基加载瞬时变形、瞬时孔压以及加载结束后固结变形规律上的差异,为该类工程的有限元分析方法的选取提供有价值的结论。研究表明,弹性分析法得到的荷载影响范围要明显大于弹塑性分析法;对于处于弱超固结或正常固结的天然路基变形分析,要尽量采用弹塑性分析法;而对于强超固结的天然路基或加固后的地基,在荷载不大情况下,可以采用弹性分析方法,但要注意边界条件设置对计算结果的影响。
An imaginary roadbed was analyzed by using elastic and elasto-plastic finite element method. Comparing the calculation results of the two methods, elastic analysis and elasto-plastic analysis method were used to study the transient deformation, instantaneous pore pressure and end of loading The differences of the post-consolidation deformation laws provide valuable conclusions for the selection of finite element analysis methods for such projects. The results show that the influence range of the load obtained by the elastic analysis method is obviously larger than that of the elasto-plastic analysis method. For the analysis of natural subgrade deformation under weak or over consolidation or normal consolidation, the elasto-plastic analysis method should be adopted as far as possible; In the case of natural subgrade or reinforced foundation, if the load is not large, the elastic analysis method can be adopted, but pay attention to the influence of the setting of boundary conditions on the calculation results.