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Chinese Journal of High Pressure Physics  > 2014  >  28(6): 648-654.
DING Yu-Qing, TANG Wen-Hui, ZHANG Ruo-Qi, RAN Xian-Wen, ZHANG Ming-Jian. Equation of State for Unsaturated Clay by Plate Impact Experiments[J]. Chinese Journal of High Pressure Physics, 2014, 28(6): 648-654. doi: 10.11858/gywlxb.2014.06.002
Citation: DING Yu-Qing, TANG Wen-Hui, ZHANG Ruo-Qi, RAN Xian-Wen, ZHANG Ming-Jian. Equation of State for Unsaturated Clay by Plate Impact Experiments[J]. Chinese Journal of High Pressure Physics, 2014, 28(6): 648-654. doi: 10.11858/gywlxb.2014.06.002
shu

Equation of State for Unsaturated Clay by Plate Impact Experiments

doi: 10.11858/gywlxb.2014.06.002
  • 1.

    Institute of Engineering Physics, College of Science, National University of Defense Technology, Changsha 410073, China

  • 2.

    The Second Institute of the Second Artillery Equiqment Academe, Beijing 100085

  • 3.

    Laboratory of High-Pressure Physics, Southwest Jiaotong University, Chengdu 610031, China

  • Received Date: 17 Dec 2012
  • Rev Recd Date: 06 Mar 2013
    Abstract
  • Using a 24 mm bore two-stage light gas gun, plate impact experiments were performed on unsaturated clay at 3 moisture contents-0, 8% and 15%-to obtain its Hugoniot data.The shock wave motions in the samples were detected by fiber-optic pins, and the pressure in the sample ranged from 1.29 to 32.54 GPa.The experiment results indicate that the moisture content has a significant effect on the shock compression properties of unsaturated clay.While compressed, the gas and water in pores cannot escape promptly due to the transient loading time, thus they dominate the shock compression properties of unsaturated clay together with the solid grains.Since water is much stiffer than gas, the compressibility of unsaturated clay decreases as the moisture content increases.Besides, a modified three-phase equation of state is introduced to describe the pressure-density relationship of the unsaturated clay, which shows good agreement with the experimental data.

     

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