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为了深入了解海砂回填路基的沉降变形规律,更好地利用海砂修筑路基,结合海砂工程特性,构建有限元模型,分析了软土地基条件下填筑速率、压实度、换填厚度及地下水位对海砂回填路基沉降变形的影响规律。研究结果表明:填筑速率对路基和土基均有影响,填筑速率越大,路基总沉降、工后沉降、差异沉降及土基沉降也越大;路基沉降与压实度大致呈线性关系,路基沉降量和差异沉降均随压实度的提高而减小,这说明增大压实度能够改善路基自身变形,提高路基承载力,减小不均匀沉降。与粉质黏土路基相比,海砂用作路基材料能够减小地下水的不利影响,减小沉降量,增强路基承载能力。
In order to get a better understanding of the settlement law of seafill backfill subgrade and to make better use of sea sand to build subgrade and to combine with the characteristics of sea sand project to construct the finite element model, the filling rate, compaction degree, And the effect of groundwater level on the settlement and deformation of seafill backfill subgrade. The results show that: the filling rate has an impact on the subgrade and embankment; the greater the filling rate is, the greater the total subgrade settlement, post-construction settlement, differential settlement and soil subsidence are. The subgrade settlement and compaction degree are roughly linear , Subgrade settlement and differential settlement both decrease with the increase of compaction degree. This shows that increasing the compaction degree can improve the subgrade deformation, improve the subgrade bearing capacity and reduce the uneven settlement. Compared with silty clay subgrade, the use of sea sand as a subgrade material can reduce the unfavorable influence of groundwater, reduce the settlement and enhance the bearing capacity of subgrade.