Geogrid dynamic characteristics of pile-net structure in low subgrade of high-speed railway

WEI Ping; WEI Jing; YANG Song-lin; CHEN Jian-feng; ZHANG Dong

Volume 17 Issue 6

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WEI Ping, WEI Jing, YANG Song-lin, CHEN Jian-feng, ZHANG Dong. Geogrid dynamic characteristics of pile-net structure in low subgrade of high-speed railway[J]. Journal of Traffic and Transportation Engineering, 2017, 17(6): 19-27.

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WEI Ping, WEI Jing, YANG Song-lin, CHEN Jian-feng, ZHANG Dong. Geogrid dynamic characteristics of pile-net structure in low subgrade of high-speed railway[J]. Journal of Traffic and Transportation Engineering, 2017, 17(6): 19-27.

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Geogrid dynamic characteristics of pile-net structure in low subgrade of high-speed railway

1.
School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China
2.
School of Civil and Geomatics Engineering, Beijing Polytechnic College, Beijing 100042, China
3.
Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China

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Author Bio:
WEI Ping(1977-), female, associate professor, doctoral student, 610888065@qq.com

YANG Song-lin(1958-), male, professor, PhD, slyang@bjtu.edu.cnslyang@bjtu.edu.cn
Received Date: 2017-08-21
Publish Date: 2017-12-25

Abstract

Abstract

The dynamic finite element model of pile-net structure in low subgrade was built by ABAQUS software, its rationality was verified with real test data, the interaction mechanism among train dynamic load, geogrid, pile and soil was analyzed, and the rules of geogrid force and deformation under dynamic load were studied.Research result shows that along the longitudinal direction of railway and before train loading, the shape of geogrid's vertical deformation at pile top is like upside down U, and the vertical deformation is about 2.27 mm.The distribution shape of geogrid's pulling stress is like M at pile top and upside down V in the soil among piles.The increment of geogrid's vertical deformation is about 0.10 mm at pile top under train load, and the vertical deformation is bigger than the geogrid deformation in the soil among piles.The pulling stress increment decreases gradually from the edge of pile top, the center of pile top to the soilamong piles.The pulling stress increment of geogrid is bigger in the soil among four piles than between two piles.Along the transverse direction of railway and before train loading, the vertical deformation of geogrid is about 12.0 mm at subgrade center.Under train load, the vertical deformation of geogrid decreases gradually from the center to the slope toe of subgrade, and the increment is about 0.47 mm.At pile top and in the soil among piles, the global distribution rules of dynamic displacement and dynamic pulling stress of geogrid are similar and diminishing from the subgrade center to the slope toe.At the slope toe of subgrade, the dynamic pulling stress changes to negative value.The vertical deformation increment and the maximum dynamic pulling tress are bigger in the transverse direction of railway than in the longitudinal direction.
- railway engineering,
- low subgrade,
- geogrid,
- pile-net structure,
- numerical analysis,
- dynamic characteristic

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References(33)

References

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