YANG Guo-lin, QIU Ming-ming, YANG Xiao, FANG Yi-he. Dynamic characteristics and parameter sensitivities of new cutting subgrade for high-speed railway in expansive soil area[J]. Journal of Traffic and Transportation Engineering, 2016, 16(1): 63-72. doi: 10.19818/j.cnki.1671-1637.2016.01.008
Citation: YANG Guo-lin, QIU Ming-ming, YANG Xiao, FANG Yi-he. Dynamic characteristics and parameter sensitivities of new cutting subgrade for high-speed railway in expansive soil area[J]. Journal of Traffic and Transportation Engineering, 2016, 16(1): 63-72. doi: 10.19818/j.cnki.1671-1637.2016.01.008

Dynamic characteristics and parameter sensitivities of new cutting subgrade for high-speed railway in expansive soil area

doi: 10.19818/j.cnki.1671-1637.2016.01.008
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  • Author Bio:

    YANG Guo-lin (1963-), male, professor, PhD, +86-731-88836045, guoling@mail.csu.edu.cn

  • Received Date: 2015-09-10
  • Publish Date: 2016-02-25
  • The field vibration test of comprehensive experimental section for new cutting subgrade of Yun-Gui High-Speed Railway in expansive soil area was carried out, the 3Dtrack-subgradebase dynamics model was established by adopting the finite difference software FLAC3 D, and the dynamic responses of new cutting subgrade and the factors sensitivity of water-proof structure layer were studied. Analysis result shows that the water-proof layer can accelerate the attenuation of dynamic stress in subgrade, and reduce the dynamic displacement of subgrade surface.Increasing the thickness and elastic modulus of water-proof layer can reduce the dynamic displacement and the dynamic stress of subgrade beneath the water-proof layer, but will increase the dynamic stress of water-proof layer surface.When the position of water-proof layer lowers, the dynamic stress of subgrade surface increases, but the dynamic displacement of subgrade surface hardly changes.It is recommended that the thickness of water-proof layer is not less than 15 cm for the requirements of Code for Design of High Speed Railway(TB 10621—2009).The sensitive factors to the dynamic stress and displacement of subgrade surface and the dynamic stress of base surface are the laying position, elastic modulus and thickness of water-proof layerin the influence order from big to small.Considering the factors'effects on the dynamic responses of subgrade, it is the optimal solution that the laying thickness of water-proof layer is 20 cm, the elastic modulus is 1.0 GPa, and the laying position is the bottom of subgrade surface.

     

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