In piled and geosynthetic-reinforced (PGR) embankment, the arching behavior determines the overburden load on piles and subsoils. Placement of geosynthetic is effective in reducing the relative displacement between pile and subsoil. When the mobilized shear stress is less than the shear strength, partially developed arching will occur. Consequently, existing analytical methods, adopting the ultimate shear strength failure criterion, need to be improved. This study developed a simplified 2D analytical method, which is based on the developing arching effect, to evaluate the load redistribution of the PGR embankment. Then, the influences of embankment height and internal friction angle, subsoil depth, ratio of pile cap width to pile clear spacing (RPC) and geosynthetic tensile stiffness on the critical height ratio, stress concentration ratio, soil arching ratio, geosynthetic tension and axial strain were investigated. This study suggests that a RPC of 1:1.0 and a one-way of single-layer geosynthetic tensile stiffness of 2000 kN/m should be considered as the sensitivity thresholds for the PGR embankment.

在桩基和土工合成材料加筋（PGR）路堤中，拱形行为决定了桩基和地基上的上覆荷载。土工合成材料的放置可有效减少桩与地基之间的相对位移。当动剪切应力小于剪切强度时，将发生部分发展的拱形。因此，需要改进采用极限抗剪强度破坏准则的现有分析方法。本研究基于发展的拱效应，开发了一种简化的二维分析方法，以评估PGR路堤的荷载重新分布。然后，路堤高度和内摩擦角，底土深度，桩帽宽度与桩净间距的比以及土工合成抗拉刚度对临界高度比，应力集中比，研究了土的拱形比，土工合成张力和轴向应变。这项研究表明，应将PGR路堤的敏感性阈值考虑为RPC的1：1.0和单层土工合成材料的单向抗张刚度为2000 kN / m。