高架路桥过渡段加筋路基沉降数值分析

Numerical Analysis on Reinforced Subgrade’s Settlement in Transition Section of Viaduct

为研究荷载作用下城市高架路桥过渡段加筋路基沉降响应,采用FLAC3D有限差分软件建立桥头结构和加筋路基的分析模型,对比土工格栅位置、层数和模量对过渡段路面沉降的影响,分析加筋对桥头纵坡的影响。结果表明:土工格栅铺设在路基与地基交界处对减小沉降的效果最好;随着格栅层数的增加,格栅对沉降的效果会减弱;随着格栅模量的增加,道路沉降有所减小;土工格栅对减小桥头纵坡、提高行车舒适度效果显著。

In order to study the settlement response of reinforced subgrade in the transition section of urban elevated road and bridge under load,the analysis model of abutment structure and reinforced subgrade was established by using FLAC3 Dsoftware to compare and analyze the geogrid position,layer number and modulus to settlement transition,and the influence of reinforcement on the longitudinal slope of the bridgehead was analyzed.The results showed that the geogrid laying at the junction of the subgrade and the foundation has the best effect on reducing the settlement.As the number of geogrid layers increases,the effect of the geogrid on the settlement will be weakened.With the increase of the geogrid modulus,the road settlement will decrease.The geogrid had a significant effect on reducing the longitudinal slope of the bridge head and improving driving comfort.