Geosynthetic reinforced pile-supported (GRPS) embankment is widely used in the construction of high-speed railways on soft foundations. Arching effect, which is a common phenomenon in the system involving soil-structure interaction, is considered a key factor in the design of GRPS embankment. Its performance has been found inevitably to affect the post-construction settlement and bearing capacity of the embankment. However, the existing design methods are mainly based on static loading condition; soil arching effect under high-cycle loading has not been fully understood. In this study, a series of numerical simulations were conducted to study the long-term behavior of GRPS embankment under traffic loading, with the consideration of arching effect in soil. An implicit–explicit transition calculation algorithm was implemented to predict the permanent deformation under high-cycle traffic loading through the data transfer and conversion between implicit and explicit numerical stages, in which the mixed “implicit” and “explicit” calculation strategy were carried out based on the high-cycle accumulation (HCA) model. By using the proposed algorithm, a cross-section of high-speed railway GRPS embankment was selected as a case for discussion. Results indicate that the affected areas of stress concentration over piles in the embankment are reduced under traffic loading. With different levels of stability, the variation of stress concentration ratio of the arching effect can be mainly classified into three groups: stable, gradually weakened, and destroyed. Through parameter study, the effect of subsoil stiffness is discussed and a reasonable modulus ratio between pile and subsoil is suggested for the design reference.

土工合成材料加筋桩支撑路堤广泛用于软基础上的高速铁路建设。拱效应是土-结构相互作用系统中的常见现象，被认为是GRPS路堤设计的关键因素。已经发现其性能不可避免地会影响路堤的施工后沉降和承载力。但是，现有的设计方法主要是基于静态载荷条件。高周荷载作用下的土拱效应尚不完全清楚。在这项研究中，进行了一系列数值模拟，以研究考虑交通荷载作用下GRPS路堤在交通荷载下的长期行为。通过隐式和显式数值阶段之间的数据传递和转换，采用隐式-显性过渡计算算法来预测高周转交通负荷下的永久变形，其中基于“隐式”和“显式”混合计算策略高循环累积（HCA）模型。利用所提出的算法，以高速铁路GRPS路堤的横截面为例进行讨论。结果表明，在交通荷载作用下，路堤桩上应力集中的影响区域减小。在不同程度的稳定性下，拱效应的应力集中率的变化主要可分为三类：稳定，逐渐减弱和破坏。通过参数研究