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中文摘要：
高速铁路路桥（涵）过渡段一直是高速铁路路基中最薄弱的环节,为了改进过渡段的性能,保证轨道的平顺性,介绍了一种由碾压混凝土和变态级配碎石组成的新型路桥（涵）过渡段。为了检验其过渡效果,建立了考虑路基结构层之间相互作用的路桥过渡段垂向动力学模型,分析了该过渡段在高速列车作用下的动力性能。结果表明：新型过渡段的轨面弯折角沿线路方向基本不变,轨面沉降沿线路方向呈线性分布,说明由碾压混凝土和变态级配碎石组成的新型过渡段能够较好地实现由刚性桥台向柔性路基的过渡;比较了过渡段沉降量的数值计算结果与实测结果,两者较接近,进一步验证了新型过渡段的合理性和优越性
英文摘要：
Bridge-subgrade transition section is always the weak link of high-speed railway subgrade.This paper introduced a new type of bridge-subgrade transition section which is composed of the roller compacted concrete and the abnormal graded gravel in order to improve the performances of transition section and guarantee the smoothness of railway.Establishing a vertical dynamic analysis model of bridge-subgrade transition section which considered the interaction among different structural layers in the subgrade system furtherly,this paper analysed the dynamic performances of this new transition section in order to check the transition effects.The results show that the bending angle of rail surface is almost constant along the rout and the settlement along the rout is linearly distributed,which verifies the new transition can realize the transition from the rigid abutment to the flexible subgrade.At last,the rationality and the superiority of the new transition are verified because the results of on-site settlement observation are close to the results of numerical analysis
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