土工织物加筋柔性台背路堤非线性计算与评价

近年来，加筋土结构的柔性桥台开始应用于工程实践，这种结构有可能在根本上防止桥头跳车的产生。为了研究这一特殊路堤结构的数值模拟计算方法，本文在考虑土的固结和土体的非线性应力应变关系的基础上，利用非线性有限元数值方法对土工织物加筋柔性台背路堤的受力性状和破坏机理进行了分析。分析结果表明，将铺有土工合成材料的桥台路堤看作由土体、土工合成材料、土体-土工合成材料界面组成的独立的平面应变三层连续体系，进行数值计算是行之有效的。计算结果显示，土工织物加筋可以有效减少桥台路堤50％的均匀沉降和66％的非均匀沉降，并能增加台背路堤的稳定性。现场监测表明，本文采用的数值模拟方法与实际工程具有一致性。

Nonlinear calculation and evaluation on mechanism of flexible abutment reinforced by geo-textiles

The abutment's differential settlement is a common and complicated issue in super highway;also there is no favorable research to it.In recent years,a new type abutment-flexible abutment was applied in engineering,which can prevent differential settlement.Considering the soil's consolidation and its non-linear constitutive relation,in this article,we analyzed the behavior and destruction mechanism of the flexible abutment reinforced by geo-textiles under loads by finite element method for comparative analysis.Three independent levels in reinforced soil were tried on its numerical evaluation of the flexible abutment,also the study showed that it was effective.The calculation indicated that the reinforcement could reduce its settlement(50%) as well as differential settlement(66%),also improve the embankment's stability.Field monitoring approved that the nonlinear analysis was correct.