- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | LI Shuanglong, WEI Limin, HE Qun, HE Chongyang. Dynamic Response Characteristics of Bridge-Tunnel Transition Section with Deep Buried Pile-Plank Structures[J]. Journal of Southwest Jiaotong University, 2021, 56(6): 1222-1231. doi: 10.3969/j.issn.0258-2724.20191096
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To understand the dynamic characteristics and performances of bridge-tunnel transition sections with deep buried pile-plank structures (DBPPS), dynamic field tests were performed on a transition zone including a tunnel entrance, a transition section and a abutment in the Shanghai—Kunming high-speed railway to investigate its dynamic response distributions under running trains with different train types, speeds and driving directions. A numerical model considering vehicle-track-subgrade coupled interaction was then established to study the railway line smoothness along the transition zone and the vertical dynamic stress distribution of the DBPPS subgrade. Results show that under the train loads with different train types, the maximum effective values of acceleration and displacement along the transition zone are 0.85 m/s2 and 0.034 mm, respectively. The vibration level of the transition section is lower than that of the tunnel and the abutment. The effective values of dynamic response in the transition section increase with the increasing train speed, and its increase rate is smaller than that of the tunnel and the abutment. The driving directions have a significant influence on the dynamic responses in the connection between the transition section and the abutment, but have a weak influence on other sections. When the train passes through the transition zone at a speed of 300 km/h, the maximum change rate of rail deflection is approximately 0.149 mm/m, and the maximum vertical acceleration of the carbody is 0.74 m/s2. The pile-plank structure can transfer the train load to the deep foundation and reduce the dynamic effect on shallow soil of the foundation.
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