中文摘要：

基于水平增强体与桩间土共同作用机理，将土工合成材料视为弹性地基上的薄膜，桩间土体则视为具有一定刚度的弹簧系列，引入弹性地基上大挠度薄膜理论，推导了在路堤荷载作用下筋材挠曲函数，进而得到双向增强复合地基桩土应力比计算公式，结合算例进一步分析了筋材变形的主要影响因素及其变化规律，算例分析结果表明该计算方法是合理的，可为工程实际提供理论参考。

英文摘要：

Based on the mechanical characteristics of the interaction between the horizontal rein- forcement and the pile-soil, the geosyntheties and the pile-soil are regarded as the elastic membrane and a series of springs with rigidity, respectively. The theory of the large-deflection membranes supported by elastic foundation is employed to deduce the function of the deflection of the reinforcement under the em- bankment loads. Thus, the formulation for calculating the pile-soil stress ration is obtained. A practical ease is given to verify the method proposed in this paper. Finally, based on the ease, the main factors which affect the settlement are analyzed systemically. The results indicates that the method is feasible and reasonable, in parallel, it can give theoretical reference to practical engineering.