Volume 39 Issue 4
Mar.  2019
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LI Kexuan, LI Tie. Micro-mechanism of bending failure of sandstone under different loading rates[J]. Explosion And Shock Waves, 2019, 39(4): 043101. doi: 10.11883/bzycj-2018-0178
Citation: LI Kexuan, LI Tie. Micro-mechanism of bending failure of sandstone under different loading rates[J]. Explosion And Shock Waves, 2019, 39(4): 043101. doi: 10.11883/bzycj-2018-0178

Micro-mechanism of bending failure of sandstone under different loading rates

doi: 10.11883/bzycj-2018-0178
  • Received Date: 2018-05-25
  • Rev Recd Date: 2018-08-27
  • Publish Date: 2019-04-01
  • The micro morphology of rock rupture is an important reflection of rock failure mechanism, in order to study the effect of different loading rates on the bending failure of sandstone, the microscopic morphology of the bending breaking cracks and the self-similarity of the cracks are analysed by scanning electron microscope combined with three point bending test. Selecting six different loading rates to test the rock samples to observe the macroscopic fracture condition and then the microstructure of surface cracks on bend fracture surfaces is observed by scanning electron microscope, and take SEM pictures at different multiplier. After the image is processed, getting the micro crack information of bending fracture of sandstone, and the fractal box dimension value of the micro crack is calculated. The results show that the proportion of transgranular fracture increases with the increase of loading rate; the crack fractal dimension also increases with the increase of loading rate, and at the same time, the fractal dimension is proportional to the bending fracture load and bending strength. It can be seen that the loading rate has a certain effect on the fracture mode, and the greater the loading rate is, the greater the failure energy requires, and the wider the crack distribution is, indicating that mining speed is closely related to rock burst and other dynamic catastrophe of rock mass.
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