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Volume 34 Issue 4
Jul 2020
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Chinese Journal of High Pressure Physics  > 2020  >  34(4): 044101.
WANG Guangyong, YU Rui, MA Dongfang, HOU Yuan. Comparative Study on Dynamic Tensile and Compressive Strength of the Saturated Fine Sandstone[J]. Chinese Journal of High Pressure Physics, 2020, 34(4): 044101. doi: 10.11858/gywlxb.20190857
Citation: WANG Guangyong, YU Rui, MA Dongfang, HOU Yuan. Comparative Study on Dynamic Tensile and Compressive Strength of the Saturated Fine Sandstone[J]. Chinese Journal of High Pressure Physics, 2020, 34(4): 044101. doi: 10.11858/gywlxb.20190857
shu

Comparative Study on Dynamic Tensile and Compressive Strength of the Saturated Fine Sandstone

doi: 10.11858/gywlxb.20190857
  • 1.

    School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan, China

  • 2.

    College of Science & Technology, Ningbo University, Ningbo 315211, Zhejiang, China

  • Received Date: 15 Nov 2019
  • Rev Recd Date: 01 Dec 2019
  • Publish Date: 25 Feb 2020
    Abstract
  • Using split Hopkinson compression bar (SHPB) device, uniaxial dynamic compression tests and dynamic split tests on fine sandstone in natural state and saturated state were carried out. The influence and difference of water and loading rate on dynamic tensile and compressive strength of fine sandstone were studied, and the failure mechanism of the fine sandstone in dynamic tension and compression was analyzed with digital image correlation (DIC) technology. The test results show that the dynamic compressive strength and tensile strength of the fine sandstone under the two states have obvious strain rate dependent effect, and they increase with the increase of loading rate. Under the same loading rate, the dynamic compressive strength of fine sandstone in saturated state is smaller than that in natural state, while the tensile strength in saturated state is larger. Water has little effect on the strain rate effect of dynamic compressive strength and tensile strength for the fine sandstone. However, water can improve the dynamic compressive strength and tensile strength enhancement factor of the fine sandstone, and has a more significant effect on the dynamic tensile strength enhancement factor. In the process of dynamic compression, the surface strain concentration of the rock specimen in saturated state is significantly less than that in natural state, the strain gradient is more significant, and the tensile-shear effect is weakened during the dynamic tensile process.

     

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