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Volume 36 Issue 3
May. 2022
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Chinese Journal of High Pressure Physics  > 2022  >  36(3): 034101.
FAN Lidan, XU Feng, YU Yongqiang, ZHANG Zhiwei, YU Liwei, ZHOU Guijie. Experimental Study of Dynamic Mechanical Characteristics of Sandstone under One-Dimensional Coupled Static-Cyclic Impact Loads[J]. Chinese Journal of High Pressure Physics, 2022, 36(3): 034101. doi: 10.11858/gywlxb.20210879
Citation: FAN Lidan, XU Feng, YU Yongqiang, ZHANG Zhiwei, YU Liwei, ZHOU Guijie. Experimental Study of Dynamic Mechanical Characteristics of Sandstone under One-Dimensional Coupled Static-Cyclic Impact Loads[J]. Chinese Journal of High Pressure Physics, 2022, 36(3): 034101. doi: 10.11858/gywlxb.20210879
shu

Experimental Study of Dynamic Mechanical Characteristics of Sandstone under One-Dimensional Coupled Static-Cyclic Impact Loads

doi: 10.11858/gywlxb.20210879
  • 1.

    School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454003, Henan, China

  • 2.

    International Joint Research Laboratory of Henan Province for Underground Space Development and Disaster Prevention, Jiaozuo 454003, Henan, China

  • 3.

    The Fourth Production Department of Hebi Coal Industry Group, Hebi 458000, Henan, China

  • Received Date: 23 Sep 2021
  • Rev Recd Date: 16 Oct 2021
  • Issue Publish Date: 30 May 2022
    Abstract
  • The coal measures sandstones in hard rock roadways were collected as the research samples, and a modified dynamic and static combined split Hopkinson pressure bar (SHPB) system was adopted to perform one-dimensional cyclic impact compression tests with the axial pressure of 5, 15 and 20 MPa and the impact pressure of 0.8, 1.0 and 1.2 MPa. Experimental results indicate that the peak stress of sandstones increase and then decrease with the increase of the impact times, while the peak strain, maximum strain and average strain rate show the opposite trends in the whole cyclic impact process without considering the axial pressure and impact pressure. Under the same impact pressure, the peak stress and cumulative cyclic impact times decrease with the increase of the axial pressure, while under the same axial pressure, the peak stress increase with the increase of the impact pressure, and cumulative impact times increase and then decrease. Under the action of one-dimensional coupled static and cyclic impact loads, the whole impact process of sandstone could be divided into the compacted stage, the internal crack development stage and the accelerated failure stage. The results of this experimental study show that the high probability of deep underground mine prop is caused by the interaction between static and dynamic loads, and the frequent disturbance of dynamic load is one of the key influencing factors.

     

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