Effect of impact velocity and axial static stress on fragmentation and energy dissipation of red sandstone

JIN Jiefang; WU Yue; ZHANG Rui; WANG Xibo; YU Xiong; ZHONG Yilu

doi:10.11883/bzycj-2019-0479

Volume 40 Issue 10

Oct. 2020

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Article Navigation > Explosion And Shock Waves > 2020 > 40(10): 103101

JIN Jiefang, WU Yue, ZHANG Rui, WANG Xibo, YU Xiong, ZHONG Yilu. Effect of impact velocity and axial static stress on fragmentation and energy dissipation of red sandstone[J]. Explosion And Shock Waves, 2020, 40(10): 103101. doi: 10.11883/bzycj-2019-0479

Citation:

JIN Jiefang, WU Yue, ZHANG Rui, WANG Xibo, YU Xiong, ZHONG Yilu. Effect of impact velocity and axial static stress on fragmentation and energy dissipation of red sandstone[J]. Explosion And Shock Waves, 2020, 40(10): 103101. doi: 10.11883/bzycj-2019-0479

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Effect of impact velocity and axial static stress on fragmentation and energy dissipation of red sandstone

doi: 10.11883/bzycj-2019-0479

1.
School of Architectural and Surveying Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China
2.
School of Resource and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China

Received Date: 2019-12-25
Rev Recd Date: 2020-02-19

Available Online: 2020-08-25

Publish Date: 2020-10-05

Abstract

Abstract

Due to the excavation unloading effect and the amplitude attenuation of stress wave, the rock masses locating the different distances away from the blasting source are subjected to different geostress and impact loadings during the blasting excavation of underground rock mass. The construction of relationship between rock dynamic failure properties with impact loadings has more important engineering practical significance compared with representating them with strain rate. In order to investigate the effect of the values of impact loading and the geostress on the characteristics of rock failure and energy dissipation, impact experiments of red sandstone were carried out with a modified split Hopkinson pressure bar testing system, the impact velocities and axial static stresses were set seven levels, respectively. The effects of impact velocity on the failure mode and mechanism of red sandstone under different axial static stresses were researched based on the broken rock specimens. By analyzing the energy values of stress waves under different experimental conditions, the effects of the impact velocity and the axial static stress on energy dissipation of red sandstone were investigated. The fragment fractal dimensions of red sandstone under different impact velocities and axial static stresses were studied based on the sieve test results of the broken specimens. The results show that the increase of impact velocity will aggravate the destroy degree of the red sandstone. The main part after macroscopic failure remains a circular cylinder when a red sandstone specimen is subjected to impact loading and no axial static stress, the failure of the specimen is resulted from its insufficiency of resistance to tensile deformation; but the main part after macroscopic failure represents a hourglass shape when the specimen is under coupled axial static stress and impact loading, the failure mechanism is mixed tension and shear fracture. The dissipation energy of the red sandstone increases in a quadratic function with increasing the impact velocity, the higher the axial static stress, the smaller the increasing amplitude. With the increase of impact velocity, the fractal dimension of the red sandstone increases from zero gradually. For a rock specimen subjected to specific axial static stress, there is a critical impact velocity which signifies that the fractal dimension of the specimen will change from zero to greater than zero, and the critical impact velocity increases first and then decreases with the increase of axial static stress.
- red sandstone,
- impact velocity,
- failure mode,
- energy dissipation,
- fractal dimension,
- axial static stress

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References

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