Numerical Investigation on Dynamic Performance of a Bridge-Tunnel Transition Section with a Deep Buried Pile-Plank Structure
To address the track irregularity at transition zones between subgrade and rigid structures (bridge, tunnel, etc.), some common transition approaches, such as trapezoid subgrade, were adopted in many engineering areas. However, in regard to a mountainous area, the common transition approaches may no...
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2020/8885535 |
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| author | Shuanglong Li Limin Wei Xiaobin Chen Qun He |
| author_facet | Shuanglong Li Limin Wei Xiaobin Chen Qun He |
| author_sort | Shuanglong Li |
| collection | DOAJ |
| description | To address the track irregularity at transition zones between subgrade and rigid structures (bridge, tunnel, etc.), some common transition approaches, such as trapezoid subgrade, were adopted in many engineering areas. However, in regard to a mountainous area, the common transition approaches may not be practicable anymore due to the limitation of the length between subgrade and rigid structures. In this paper, a new type of bridge-tunnel transition section with a deeply buried pile-plank structure (DBPPS) for short-distance transition is introduced. A three-dimensional finite element model that considers vehicle-track-subgrade coupling vibration is proposed to study the dynamic performances of a DBPPS transition section in the Shanghai–Kunming high-speed railway. With this model that has been validated with measured responses from field tests, the dynamic responses and the smoothness in track stiffness along the transition zone are analyzed. In addition, the influences of train speed, axle load, and train direction on dynamic responses are investigated, and the influences of two optimization strategies, including varying-length piles and constant-length piles, on the stiffness smoothness of the DBPPS transition section are discussed. Results show that the vibration level of the DBPPS transition section is lower than that of the abutment and the tunnel, and the additional load caused by vertical track stiffness difference aggravates the vibration at the connections between the DBPPS transition section and the abutment (or tunnel). Furthermore, the smoothness in stiffness along the transition zone can be significantly improved by the improvement strategy with varying-length piles. |
| format | Article |
| id | doaj-art-31f0ea65c0824a4d89623d332e350f65 |
| institution | Kabale University |
| issn | 1687-8086 1687-8094 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj-art-31f0ea65c0824a4d89623d332e350f652025-02-03T01:01:54ZengWileyAdvances in Civil Engineering1687-80861687-80942020-01-01202010.1155/2020/88855358885535Numerical Investigation on Dynamic Performance of a Bridge-Tunnel Transition Section with a Deep Buried Pile-Plank StructureShuanglong Li0Limin Wei1Xiaobin Chen2Qun He3School of Civil Engineering, Central South University, Changsha, Hunan 410075, ChinaSchool of Civil Engineering, Central South University, Changsha, Hunan 410075, ChinaSchool of Civil Engineering, Central South University, Changsha, Hunan 410075, ChinaSchool of Civil Engineering, Central South University, Changsha, Hunan 410075, ChinaTo address the track irregularity at transition zones between subgrade and rigid structures (bridge, tunnel, etc.), some common transition approaches, such as trapezoid subgrade, were adopted in many engineering areas. However, in regard to a mountainous area, the common transition approaches may not be practicable anymore due to the limitation of the length between subgrade and rigid structures. In this paper, a new type of bridge-tunnel transition section with a deeply buried pile-plank structure (DBPPS) for short-distance transition is introduced. A three-dimensional finite element model that considers vehicle-track-subgrade coupling vibration is proposed to study the dynamic performances of a DBPPS transition section in the Shanghai–Kunming high-speed railway. With this model that has been validated with measured responses from field tests, the dynamic responses and the smoothness in track stiffness along the transition zone are analyzed. In addition, the influences of train speed, axle load, and train direction on dynamic responses are investigated, and the influences of two optimization strategies, including varying-length piles and constant-length piles, on the stiffness smoothness of the DBPPS transition section are discussed. Results show that the vibration level of the DBPPS transition section is lower than that of the abutment and the tunnel, and the additional load caused by vertical track stiffness difference aggravates the vibration at the connections between the DBPPS transition section and the abutment (or tunnel). Furthermore, the smoothness in stiffness along the transition zone can be significantly improved by the improvement strategy with varying-length piles.http://dx.doi.org/10.1155/2020/8885535 |
| spellingShingle | Shuanglong Li Limin Wei Xiaobin Chen Qun He Numerical Investigation on Dynamic Performance of a Bridge-Tunnel Transition Section with a Deep Buried Pile-Plank Structure Advances in Civil Engineering |
| title | Numerical Investigation on Dynamic Performance of a Bridge-Tunnel Transition Section with a Deep Buried Pile-Plank Structure |
| title_full | Numerical Investigation on Dynamic Performance of a Bridge-Tunnel Transition Section with a Deep Buried Pile-Plank Structure |
| title_fullStr | Numerical Investigation on Dynamic Performance of a Bridge-Tunnel Transition Section with a Deep Buried Pile-Plank Structure |
| title_full_unstemmed | Numerical Investigation on Dynamic Performance of a Bridge-Tunnel Transition Section with a Deep Buried Pile-Plank Structure |
| title_short | Numerical Investigation on Dynamic Performance of a Bridge-Tunnel Transition Section with a Deep Buried Pile-Plank Structure |
| title_sort | numerical investigation on dynamic performance of a bridge tunnel transition section with a deep buried pile plank structure |
| url | http://dx.doi.org/10.1155/2020/8885535 |
| work_keys_str_mv | AT shuanglongli numericalinvestigationondynamicperformanceofabridgetunneltransitionsectionwithadeepburiedpileplankstructure AT liminwei numericalinvestigationondynamicperformanceofabridgetunneltransitionsectionwithadeepburiedpileplankstructure AT xiaobinchen numericalinvestigationondynamicperformanceofabridgetunneltransitionsectionwithadeepburiedpileplankstructure AT qunhe numericalinvestigationondynamicperformanceofabridgetunneltransitionsectionwithadeepburiedpileplankstructure |