饱和软土场地格栅加筋路堤地震动力响应分析

Seismic Response of Geogrid Reinforced Embankment in Saturated Soft Subgrade

为探讨饱和软土场地中格栅加筋路堤地震动力响应特性规律,基于大型通用有限元分析软件ADINA,建立了饱和软土地基上格栅加筋路堤的数值分析模型,研究了布筋方式、筋材弹性模量与间距及路堤填料性质对格栅加筋路堤地震动力响应的影响规律.结果表明:增大筋材弹性模量可有效提升路堤动力稳定性,且筋材越靠近路堤底部其效果越显著;随着加筋层数增加,加筋效果提升率有所衰减;增加填料摩擦角和填料黏聚力可提高加筋路堤动力性能,但填料土性参数达到一定幅值后,其变化所引起动力性能提升效果降低.

In order to discuss the dynamic response characteristics of geogrid reinforced embankment in saturated soft subgrade,numerical models for the interaction system of geogrid reinforced embankment and saturated soft subgrade were established to investigate the effects of the reinforcement mode,the elastic modulus of geogrid,the geogrid spacing and the properties of embankment filler on the dynamic response of geogrid reinforced embankment. The numerical results show that the increasing elastic modulus of geogrid can significantly improve the dynamic performance of embankment when the geogrid is close to the bottom of embankment; the reinforcement effect decays with the increase of geogrid layers; the increasing internal friction angle and cohesion of embankment filler can improve the dynamic performance of geogrid reinforced embankment and the effect attenuates when material parameters reach to certain values.