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通过某高速铁路试验段现场动载试验,测试过渡段不同断面、不同深度处路基的动应力、弹塑性变形和路基综合动刚度,分析在模拟列车动荷载作用下的动态反应和工程特性。测试结果表明:①级配碎石基床表层对过渡段路基动应力的衰减效果明显,基床表层动应力衰减系数沿纵向逐渐减小,基床底层则逐渐增大;②各断面弹塑性变形主要集中在基床表层,沿纵向呈增大趋势,沿深度逐渐减小;③路基综合动刚度与基床表层、底层、路堤本体的刚度有关。过渡段路基从动应力传递规律、弹塑性变形、路基综合动刚度等方面起到了过渡作用。
The dynamic stress and elastic-plastic deformation of subgrade and dynamic stiffness of subgrade at different sections and depths of the transition section were tested by on-site dynamic test in a test section of a high-speed railway. Dynamic response and engineering characteristics under simulated train dynamic loads were analyzed. The test results show that: (1) the attenuation of dynamic stress in the transitional section of the graded macadam bed is obvious; the dynamic stress attenuation coefficient of the bed surface decreases gradually along the longitudinal direction and the basement bed gradually increases; (2) Mainly concentrated in the surface of the bed, increasing along the longitudinal direction, and gradually decreasing along the depth; (3) The comprehensive dynamic stiffness of the roadbed is related to the stiffness of the surface, bottom and embankment of the bed. The transitional subgrade dynamic stress transfer law, elastic deformation, subgrade dynamic stiffness and other aspects played a transitional role.