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Volume 33 Issue 1
Jan 2019
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Chinese Journal of High Pressure Physics  > 2019  >  33(1): 014102.
LIANG Rui, ZHOU Wenhai, YU Jianping, LI Zhenbao, DU Chaofei, WANG Dunfan. Numerical Simulation of Rock Tension-Compression Fracture Caused by Impact Load during Slope Casting Blast[J]. Chinese Journal of High Pressure Physics, 2019, 33(1): 014102. doi: 10.11858/gywlxb.20180535
Citation: LIANG Rui, ZHOU Wenhai, YU Jianping, LI Zhenbao, DU Chaofei, WANG Dunfan. Numerical Simulation of Rock Tension-Compression Fracture Caused by Impact Load during Slope Casting Blast[J]. Chinese Journal of High Pressure Physics, 2019, 33(1): 014102. doi: 10.11858/gywlxb.20180535
shu

Numerical Simulation of Rock Tension-Compression Fracture Caused by Impact Load during Slope Casting Blast

doi: 10.11858/gywlxb.20180535
  • 1.

    School of Petrochemical Technology, Lanzhou University of Technology, Lanzhou 730050, China

  • 2.

    Ocean College, Zhejiang University, Zhoushan 316021, China

  • Received Date: 03 Apr 2018
  • Rev Recd Date: 19 Apr 2018
  • Issue Publish Date: 25 Feb 2019
    Abstract
  • In order to study the change law of physical parameters in the process of rock fracturing and throwing during slope bench blasting, the equation of rock damage under dynamic tension-compression effect was established and applied to numerical analysis. The results showed that the tendency of time node and step size in simulation was basically identical with the triaxial synthetic rate curve of vibration wave and particle vibration displacement, which can be used as a criterion for reducing vibration and decreasing disaster. Cracks were formed in the foot of slope at about 0.6 ms and completely extended at about 12.5 ms. The pulverizing area radius around the blast hole was 28 cm. The rock separation phenomenon was preliminarily observed at the middle part of the blast hole. The maximum throwing velocity was distributed in the vertical region between this part and the free surface of the slope. The throwing velocity at the free surface was less than that of the rocks around the blast hole, which results in the secondary crushing phenomenon during the throwing process. The large bulk rocks were mainly produced in the toe of slope, the surrounding rock on both sides of the contact surface between explosive and plug, and the free-surface at the top of the step. The range of large rock diameter in the process of blasting was 1.6–2.7 m.

     

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