软土路堤柔性桩复合地基工作机理研究

在分析柔性路堤下桩土受力性状的基础之上，利用有限元分析软件Ｐｌａｘｉｓ建立复合地基数值模型，对柔性桩复合地基中不同的垫层模量及厚度的选取进行了模拟，重点研究了桩土及垫层的受力特性。分析结果表明:当其他指标相同时，在相同均布荷载下，垫层模量对关键指标的影响不大；随着垫层厚度的增加，垫层最大沉降及桩顶刺入量均逐渐减小并稳定在某一区间以内；桩顶应力及桩土应力比逐渐增大，并有逐渐稳定趋势。研究成果可为软土路堤柔性桩复合地基的设计工作提供有益参考。

Study on Working Mechanism of Flexible-pile Composite Foundation in Soft Base Areas

Based on the analysis of flexible embankment＇ s pile-soil stress traits, the numerical simulation model for dif- ferent cushion modulus and thickness were built by the finite element analysis software Plaxis to study the stress character- istics of pile soil and cushion. The results show that when the other indicators are the same, and under the same dis- tributed load, the cushion modulus has a little effect on key indicators; with the increase of cushion thickness, the largest displacement and penetration of the cushion are gradually decreased and stabilized in a certain range; the pile-top stress and pile-soil stress ratio is gradually increased and has the signs of gradual stabilization. The research results can provide a valuable reference for the design of the flexible-pile foundation in soft base areas.