Dynamic Behavior of Vehicle-Slab Track in the Condition of Subgrade and Culvert Transition Settlement
It is a common phenomenon for the settlement in the area of subgrade and culvert transition. Based on the theory of vehicle-track coupling dynamics, the vehicle-slab track-subgrade and culvert transition model was established. And the influence of differe
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Introduction In high speed railway lines, there exists big difference between culvert and subgrade stiffness. In order to enhance the safety and stability of the train, it is necessary to establish transition structure between the subgrade and culvert, making stiffness change uniformly and stably. However, due to the complex filling materials of the subgrade and culvert transition section, it is common phenomenon for transition area to be affected by rain, freeze and other adverse natural conditions, resulting in reduction of safety and stability of the train. Therefore, the domestic and foreign scholars put a lot of work in the subgrade and culvert transition section for dynamic characteristics analysis and maintenance measurements, putting forward many innovative theories and methods. The settlement of the subgrade and culvert transition area will cause the serious wheel rail impact, which will aggravate the deterioration of the track structure, and reduce the safety and stability of the train. Japan [1] researched settlement problems of subgrade and culvert transition section. German [2] studied the stiffness variation X. Cai (&) C. Ren L. Guo Q. Miao School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China e-mail: [email protected] C. Ren e-mail: [email protected] L. Guo e-mail: [email protected] Q. Miao e-mail: [email protected] Y. Kai Zhejiang Institute of Communications, Hangzhou, Zhejiang 311112, China e-mail: [email protected] © Springer Nature Singapore Pte. Ltd. and Zhejiang University Press 2018 X. Bian et al. (eds.), Environmental Vibrations and Transportation Geodynamics, DOI 10.1007/978-981-10-4508-0_37
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of transition section influence on the wheel rail impact. America [3] researched optimization problem of the subgrade and culvert transition structure form. Momoya [4] through the finite element calculation and field test, studied the development mechanism of subgrade settlement under train load. A further study on the optimization problem of the subgrade and culvert transition section structure was made by Da and Shen et al. [5]. Tian [6] made a study on the dynamic response and the influence scope of the subgrade and culvert transition of high speed railway. The subgrade and culvert transition section of the dynamic performance test was made by Yang et al. [7]. Overall, on the part of the settlement deformation in subgrade and culvert transition section, the existing researches mostly focus on the optimization of the transition structure and prevention measures. Fewer researches are made on the vehicle-track dynamics behavior effected by the settlement deformation of transition area. Study on the dynamic characteristics of the vehicle-track structure is incomplete. Based on the dynamic theory of the vehicle-track coupling system [8, 9], the dynamic model of the vehicle-track-subgrade interaction system was developed. The dynamic behaviors of the vehicle, the track in uneven settlement were calculated and the wheel rail interaction relationship a
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