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Volume 36 Issue 6
Dec 2022
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Chinese Journal of High Pressure Physics  > 2022  >  36(6): 064102.
ZHANG Hengyuan, GUO Jiaqi, SUN Feiyue, SHI Xiaoyan, ZHU Zihui. Acoustic Emission and Fracture Evolution Characteristics of Granite under Different Testing and Moisture Conditions[J]. Chinese Journal of High Pressure Physics, 2022, 36(6): 064102. doi: 10.11858/gywlxb.20220577
Citation: ZHANG Hengyuan, GUO Jiaqi, SUN Feiyue, SHI Xiaoyan, ZHU Zihui. Acoustic Emission and Fracture Evolution Characteristics of Granite under Different Testing and Moisture Conditions[J]. Chinese Journal of High Pressure Physics, 2022, 36(6): 064102. doi: 10.11858/gywlxb.20220577
shu

Acoustic Emission and Fracture Evolution Characteristics of Granite under Different Testing and Moisture Conditions

doi: 10.11858/gywlxb.20220577
  • 1.

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

  • 2.

    Institute of Defense Engineering, AMS, PLA, Luoyang 471023, Henan, China

  • Received Date: 06 May 2022
  • Rev Recd Date: 30 May 2022
  • Accepted Date: 23 Aug 2022
    • Available Online: 04 Nov 2022
  • Issue Publish Date: 05 Dec 2022
    Abstract
  • To reveal the fracture evolution mechanism and crack propagation law of water-bearing granite, uniaxial compression, Brazilian splitting and direct shear tests of granite with different water-bearing states were carried out. The mechanical and acoustic information of rock during deformation and failure were obtained. Combined with acoustic emission ringing count and the relationship between RA (ratio of rise time to amplitude) and AF (average frequency), the microscopic fracture characteristics of water-bearing granite under different test conditions were clarified. The results show that water has obvious weakening effect on the compressive strength, tensile strength, shear strength and elastic modulus of rock. There are significant differences in acoustic emission activities of granite under different test conditions. Under uniaxial compression, the ringing count of acoustic emission surges near the peak stress point and the signal activity mainly occurs after the peak stress point. Under Brazilian splitting condition, the overall fluctuation of the ringing count of acoustic emission is relatively small. Under direct shear test, the ringing count surges significantly earlier than that of uniaxial compression and increases in a stepwise manner. The influence mechanism of water on shear cracks and tensile cracks of granite under different test conditions is similar, that is, the presence of water increases the number of tensile cracks in the rock and reduces the number of shear cracks. In uniaxial compression, tensile cracks show a trend of decreasing first and then increasing, while shear cracks are always decreasing. Shear cracks play a leading role in the direct shear test, and tensile cracks play a leading role in the Brazilian splitting. The research results provide some reference for further study on the fracture characteristics of engineering surrounding rock under different stress conditions.

     

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