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YANG Xiao-hua, WAN Qi, LIU Da-peng, BAO Han. Dynamic characteristics of gravel soil low embankment in Xinjiang[J]. Journal of Traffic and Transportation Engineering, 2019, 19(3): 1-9. doi: 10.19818/j.cnki.1671-1637.2019.03.001
Citation: YANG Xiao-hua, WAN Qi, LIU Da-peng, BAO Han. Dynamic characteristics of gravel soil low embankment in Xinjiang[J]. Journal of Traffic and Transportation Engineering, 2019, 19(3): 1-9. doi: 10.19818/j.cnki.1671-1637.2019.03.001
shu

Dynamic characteristics of gravel soil low embankment in Xinjiang

doi: 10.19818/j.cnki.1671-1637.2019.03.001
  • 1.

    School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China

  • 2.

    School of Construction Management, Jiangsu Vocational Institute of Architectural Technology, Xuzhou 221116, Jiangsu, China

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  • Author Bio:

    YANG Xiao-hua (1961-), male, professor, PhD, xiaohuay@126.com

  • Corresponding author: WAN Qi(1990-), female, doctoral student, wanqi77@163.com.
  • Received Date: 2018-12-16
  • Publish Date: 2019-06-25
    Abstract
  • Based on the Sanchakou-Shache Expressway in Xinjiang, the subgrade model test with 1∶1 ratio was carried out within the influence range of one wheel for the standard axle load, and the dynamic characteristics of low embankment were studied under vehicle load. The different moisture content states of the subsoil in service in the oasis area were considered, the low embankment road structure was divided into four parts, including pavement, base, subgrade, and subsoil according to the general road design standards, the dynamic characteristics of low embankment under different loads were simulated, and the effects of peak values, frequencies and repetition times of dynamic loads on the dynamic characteristics were studied. Research result indicates that the vertical stresses under different loading cases decrease rapidly with the increase of subgrade depth, and attenuate by 69.2% at the depth of 0.8 m. The stresses at different depths vary linearly with the static and short-term dynamic load, while the strains show a nonlinear trend. Due to the modulus difference of different soil layers, the strains appear obvious stratification in the subgrade and subsoil. The change of water content of the subsoil has obvious influence on the dynamic characteristics of low embankment, and the strain at the top of the subsoil increases by 1.8 times when the water content increases from 18% to 28%.The increase of short-term dynamic load frequency has little effect on the stress and strain, and they decrease by 7% and 9%, respectively when the frequency increases from 1 Hz to 5 Hz at the tops of the subgrade and subsoil.When the peak values of static load, short-term dynamic load and long-term dynamic load are 50 kN at the tops of the subgrade and subsoil, the stress and strain under the short-term dynamic load are 79%-95% and 75%-95% of the values under the static load, respectively, while the stress and strain caused by the long-term dynamic load are 1.02-1.11 and 1.9-3.3 times of the values under the static load, respectively.

     

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