中文摘要：

在高填方路基后处理复合地基中,软弱土层的初始固结度对工后复合路基工作性能的影响显著。采用有限元软件建立高填方路基后处理复合地基的数值分析模型,分析了软弱地基条件下分层碾压填方路基采用后处理技术形成的复合地基初始固结度对工后复合路基中刚性小桩桩侧摩阻力、桩身轴力的分布和发展变化规律的影响,研究总结了复合地基初始固结度对工后复合路基工作性能的影响规律。结果表明,高填方路基后处理技术能够通过小桩成孔和注浆施工来快速消散高填方路基施工过程中下部软弱土层产生的超孔隙水压力,提高土体有效应力;增大初始固结度能够减小路基工后沉降,有效改善路基工作性能。研究成果对高填方路基后处理技术的优化设计和施工具有指导意义。

英文摘要：

The initial consolidation degree of post-processed high fill subgrade has great impact on the service behavior of composite embankment which has been established, a numerical model is correspondingly established by ABAQUS software to analyze the distribution and developmental tendency of the side friction resistance and axial stress of the pile in post-processed high fill subgrade embankment on different initial consolidation, and study the working performance of the composite embankment which has been constructed in different initial consolidation. The results reveal that the process of hole-digging and grouting not only can significantly dissipate the excessive pole water pressure, but also transfer the load into deep soil, and the increasing the initial consolidation degree is able to improve the service behavior of the embankment and reduce the settlement. The results can provide guidence for optimal design and construction of the post-processed high fill subgrade embankment.