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针对传统方法存在保守荷载假设的局限性,考虑路基固结过程中实际体力的非保守特点,提出了路基平面应变固结性状分析的非保守大变形有限元法;并利用该方法对填土分级堆载作用下软土路基固结性状进行了算例分析。结果表明:当忽略体力的非保守性质时,非保守方法可以退化为传统方法;传统方法预测的路基平面应变固结沉降量、侧向位移值和超静孔压等一般均大于非保守方法的分析结果;非保守大变形有限元法可以有效提高路基平面应变固结变形的预测精度,尤其对于路基变形较大的情况更是如此。
Aiming at the limitation of the conservative load assumption in the traditional method and considering the non-conservative characteristics of actual physical force in the consolidation process of subgrade, a non-conservative large deformation finite element method for the analysis of strain consolidation in subgrade is proposed. The consolidation behavior of soft soil under embankment is analyzed. The results show that the non-conservative method can be degenerated into the traditional method when ignoring the non-conservative nature of the physical force. The strain settlement, lateral displacement and excess pore pressure of the subgrade are generally larger than the non-conservative methods The results of the analysis show that the non-conservative large deformation finite element method can effectively improve the prediction accuracy of the plane strain consolidation deformation of subgrade, especially for the case of large subgrade deformation.