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在分析高速公路软土路基固结变形机理基础上,采用有限元软件MIDAS-GTS建立数值计算模型,结合实测数据,对分步填筑高度下的软土路基固结沉降变形规律进行了初步分析。结果表明:在路基分步填筑过程中,填土加载引起内部孔隙急剧变化,水体流失产生附加应力导致路基沉降;随着分层填方高度的增大,路基沉降量也随之增大;采用旋喷桩对软土地基进行改良后,沉降量显著减小,与实测数据较为吻合。分析结果可为软土填方路基的沉降计算分析和加固方式提供参考依据。
Based on the analysis of consolidation mechanism of soft soil subgrade in expressway, numerical simulation model was established by using finite element software MIDAS-GTS. Combined with the measured data, the consolidation settlement of soft soil subgrade at the step filling height was analyzed preliminarily . The results show that in the process of subgrade filling, the filling of soil leads to the rapid change of internal porosity and additional stress resulting in the loss of water body leading to the subgrade settlement. As the height of stratified filling increases, the settlement of subgrade increases. After the improvement of soft soil foundation with jet grouting pile, the settlement decreased significantly, which was in good agreement with the measured data. The results of the analysis can provide reference for settlement calculation and reinforcement of embankment filled with soft soil.