Model tests on XCC-piled embankment under dynamic train load of high-speed railways
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Piled embankments, which offer many advantages, are increasingly popular in construction of high-speed railways in China. Although the performance of piled embankment under static loading is well-known, the behavior under the dynamic train load of a high-speed railway is not yet understood. In light of this, a heavily instrumented piled embankment model was set up, and a model test was carried out, in which a servo-hydraulic actuator outputting M-shaped waves was adopted to simulate the process of a running train. Earth pressure, settlement, strain in the geogrid and pile and excess pore water pressure were measured. The results show that the soil arching height under the dynamic train load of a high-speed railway is shorter than under static loading. The growth trend for accumulated settlement slowed down after long-term vibration although there was still a tendency for it to increase. Accumulated geogrid strain has an increasing tendency after long-term vibration. The closer the embankment edge, the greater the geogrid strain over the subsoil. Strains in the pile were smaller under dynamic train loads, and their distribution was different from that under static loading. At the same elevation, excess pore water pressure under the track slab was greater than that under the embankment shoulder.
Keywordspiled embankment model test dynamic train load of high-speed railways XCC-pile M-shaped wave
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The research described in this paper was financially supported by the National Natural Science Foundation of China (Nos. 51622803, 51378177 and 51420105013) and the 111 Project (Grant NO. B13024).
- Aoki H, Nishioka H, Tateyama M, Yazaki S and Shinoda M (2006), “Field Test of Embankment Constructed by Column-Net Method,” Proceedings of the 8th International Conference on Geosynthetics (8ICG), Vols 1–4. Yokohama, Japan, 1011–1014.Google Scholar
- Gartung E, Verspohl J, Alexiew D and Bergmair F (1996), “Geogrid Reinforced Railway Embankment on Piles-Monitoring,” Proceedings of the 1st European Geosynthetics Conference, Maastricht, Netherlands, 251–258.Google Scholar
- Heitz C, Lüking J and Kempfert HG (2008), “Geosynthetic Reinforced and Pile Supported Embankments under Static and Cyclic Loading,” Proceedings of the 4th European Geosynthetics Conference, Edinburgh, U.K., 1–5.Google Scholar
- Hewlett W and Randolph M (1988), “Analysis of Piled Embankments,” Ground Engineering, 25(6): 12–18.Google Scholar
- Jiang Hongguang, Bian Xuecheng, Xu Xiang, Chen Yunmin and Jiang Jianqun (2014), “Full-Scale Model Tests on Dynamic Performances of Ballastless High-Speed Railways under Moving Train Loads,” Chinese Journal of Geotechnical Engineering, 36(2): 354–362. (in Chinese)Google Scholar
- Kempfert H, Göbel C, Alexiew D and Heitz C (2004), “German Recommendations for Reinforced Embankments on Pile-Similar Elements,” Proceedings of the 3rd European geosynthetics conference, geotechnical engineering with geosynthetics, Munich, Germany, 279–284.Google Scholar
- Love J and Milligan G (2003), “Design Methods for Basally Reinforced Pile-Supported Embankments over Soft Ground,” Ground Engineering, 36(3): 39–43.Google Scholar
- German Geotechnical Society (2010), Recommendations for Design and Analysis of Earth Structures Using Geosynthetic Reinforcements-EBGEO, ISBN 978-3-433-02983-1 and digital in English ISBN 978-3-433-60093-1 Wilhelm Ernst & Sohn, Berlin, Germany.Google Scholar
- Wu Jun, Liao Shaoming and Huo Xiaobo, (2015), “Change of Hydraulic Conductivity of Filter Cake Caused by Train Vibration Load of a Running Subway,” Chinese Journal of Geotechnical Engineering, 37(6): 1093–1104. (in Chinese)Google Scholar
- Xiao Hong, Jiang Guanlu and Wei Yongxing (2010), “Dynamic Test Analysis on Ballastless-Track Column-Net Structure Subgrade of the Suining-Chongqing Railway Line,” Journal of the China Railway Society, 32(1): 79–84. (in Chinese)Google Scholar
- Xie Dingyi (2011), Soil Dynamics, Beijing: Higher Education Press. (in Chinese)Google Scholar
- Xu Jin (2012), “Research on Model Test System of High Speed Railway Subgrade and Dynamics Analysis,” ph.D. Dissertation, Central South University, Changsha. (in Chinese)Google Scholar