桩承式加筋路堤作用机理理论分析与数值模拟

软土地基上填筑高路堤常常面临地基承载力不足、沉降和不均匀沉降过大等问题。桩承式加筋路堤能够有效地解决这些难题。通过理论分析和有限元数值模拟，研究了路堤填土-加筋材料-桩体-桩间土之间的相互作用机理，讨论了路堤填土中的土拱效率、桩体效率、路堤底面差异沉降和筋材拉力的变化规律。研究结果表明，填土中的土拱效应和筋材张力膜效应能够有效地提高桩体效率，防止软土屈服；筋材内部拉力呈非线性分布，桩顶边缘处筋材拉力最大。

Theoretical Analysis and Numerical Simulation of Embankment Reinforced With Geosynthetics and Pile-wall

The construction of high embankments on soft ground faces several challenges, such as potential bearing capacity failure, intolerable total or differential settlements. Horizontal geosynthetic reinforcement combined with vertical reinforcement using piles or pile walls can provide an economical and effective solution to ground improvement to support high embankments. Theoretical and numerical analyses were conducted to investigate the interaction among the embankment fill, geosynthetics,pile-walls and soft soil. The variation laws of the soil arch efficiency, the pile-wall efficiency, the differential settlement at the embankment bottom and the tension in geosynthetics are also discussed. Research results show that the soil arch effect in fill combined with the tension membrane effect of geosynthetics can considerably enhance the pile-wall efficiency, and minimize the yielding of the soft soil; the distribution of tension in geosynthetics is not uniform and the maximum value of tension generates at the edge of pile-wall.