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Volume 39 Issue 5
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BA Zhen-ning, LIANG Jian-wen, WANG Jing-ya. Isolation effect of an open trench against train-induced vibrations in a saturated layered ground[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(5): 848-858. DOI: 10.11779/CJGE201705009
Citation: BA Zhen-ning, LIANG Jian-wen, WANG Jing-ya. Isolation effect of an open trench against train-induced vibrations in a saturated layered ground[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(5): 848-858. DOI: 10.11779/CJGE201705009
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Isolation effect of an open trench against train-induced vibrations in a saturated layered ground

  • 1. Department of Civil Engineering, Tianjin University, Tianjin 300072, China;
    2. Key Laboratory of Coastal Structures in Civil Engineering and Safety of Ministry of Education, Tianjin 300072, China;
    3. Department of Civil Engineering, Shanxi Agriculture University, Jinzhong 030800, China

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  • Received Date: February 27, 2016
  • Published Date: May 24, 2017
    Graphical Abstract
    • Abstract
  • Based on the Biot's theory of the two-phased poroelasticity medium, a coupled model for a saturated layered ground containing an open trench and track is developed, and the effect of the open trench on reducing the vibration generated by a moving train is investigated. Firstly, the whole model is decomposed into two substructures, which are the saturated ground containing open trench and the track. Then, the dynamic responses of the saturated ground induced by the moving line-distributed vertical loads are calculated by using the 2.5D indirect boundary element method (IBEM), and simultaneously the dynamic responses of the track under the moving train loads and distributed loads are solved. Finally, the layered ground and the track are assembled according to the equivalence between the deformation of the track and the vertical displacement of the layered ground on the center point of the track. The validity of the proposed method is confirmed by comparing its results with the published ones. Numerical calculations are performed by taking uniform saturated half-space and a single saturated layer resting on the saturated half-space as models, and the effects of the parameters of the ground and the trench are studied. The numerical results show that the isolation effect of the trench on the layered saturated ground is better than that on the uniform saturated ground. The isolation effect of the trench on the saturated ground is better than that on the corresponding elastic ground. In addition, The trench depth, the porosity of saturated layer and the stiffness ratio of bedrock to saturated layer have significant influences on the isolation effect of the trench.
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    • References (32)
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