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Volume 30 Issue 5
Sep.  2017
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Journal of Southwest Jiaotong University  > 2017  >  30(5): 919-925.
HUANG Junjie, SU Qian, ZHAO Wenhui, WANG Wubin. Model Experimental Study on Dynamic Performance of Special Soil Subgrade Reinforced with Composite Geomembrane Seal Layer[J]. Journal of Southwest Jiaotong University, 2017, 30(5): 919-925. doi: 10.3969/j.issn.0258-2724.2017.05.011
Citation: HUANG Junjie, SU Qian, ZHAO Wenhui, WANG Wubin. Model Experimental Study on Dynamic Performance of Special Soil Subgrade Reinforced with Composite Geomembrane Seal Layer[J]. Journal of Southwest Jiaotong University, 2017, 30(5): 919-925. doi: 10.3969/j.issn.0258-2724.2017.05.011
shu

Model Experimental Study on Dynamic Performance of Special Soil Subgrade Reinforced with Composite Geomembrane Seal Layer

doi: 10.3969/j.issn.0258-2724.2017.05.011
  • Received Date: 23 Jun 2015
  • Publish Date: 25 Oct 2017
    Abstract
  • To analyze the protective effect of a composite geomembrane seal layer on special soil subgrades, two full-scale models of ballast track-special soil subgrade were developed. In this study, the dynamic performance of ballast track-special soil subgrades with and without a composite geomembrane seal layer were investigated under both soaked and unsoaked conditions. The test results show that the vibration in the model without a composite geomembrane seal layer is more severe than the vibration in the model with a composite geomembrane seal layer for the same loading frequency and level. Under cyclic loading in unsoaked conditions, the accumulative settlement of the models with and without a composite geomembrane seal layer tends to stabilize at cyclic loading greater than 80,000 cycles. Under cyclic loading in soaked conditions, the accumulative settlement of the model without a composite geomembrane seal layer continually increases, while the accumulative settlement of the model with a composite geomembrane seal layer gradually stabilizes. When the cyclic loading reaches 1,400,000 cycles, the moisture content of the special soil is increased by 41%, while the K30 value at the top of the bottom layer of the subgrade is reduced by 39% in the model without a composite geomembrane seal layer. However, the moisture content of the special soil and K30 values for the model with a composite geomembrane seal layer remain basically unchanged. The composite geomembrane used for protecting the special soil of a subgrade bed can effectively intercept water seeping into the subgrade bottom of a bed filled with special soil, which can prevent the special soil from softening. Therefore, the ballast track-special soil subgrade demonstrates favorable long-term dynamic stability when subjected to cyclic loading.

     

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