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Volume 37 Issue 5
Nov 2023
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Chinese Journal of High Pressure Physics  > 2023  >  37(5): 054103.
ZHU Zihui, GUO Jiaqi, SUN Feiyue, ZHANG Hengyuan. Experimental Study on Acoustic Emission and Crack Propagation of Fissured Sandstone with Different Moisture States[J]. Chinese Journal of High Pressure Physics, 2023, 37(5): 054103. doi: 10.11858/gywlxb.20230665
Citation: ZHU Zihui, GUO Jiaqi, SUN Feiyue, ZHANG Hengyuan. Experimental Study on Acoustic Emission and Crack Propagation of Fissured Sandstone with Different Moisture States[J]. Chinese Journal of High Pressure Physics, 2023, 37(5): 054103. doi: 10.11858/gywlxb.20230665
shu

Experimental Study on Acoustic Emission and Crack Propagation of Fissured Sandstone with Different Moisture States

doi: 10.11858/gywlxb.20230665
  • 1.

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

  • 2.

    School of Emergency Management, Henan Polytechnic University, Jiaozuo 454000, Henan, China

  • Received Date: 17 May 2023
  • Rev Recd Date: 06 Jun 2023
    • Available Online: 07 Oct 2023
  • Issue Publish Date: 07 Nov 2023
    Abstract
  • To further reveal the crack propagation law and failure characteristics of fissured sandstone with different moisture states, the uniaxial compression tests of steeply dipping fissured sandstone were carried out with different moisture states of dry, natural, and saturated. Acoustic emission (AE) and digital image correlation (DIC) techniques were used to analyze the effects of moisture state on the mechanical properties, AE characteristics, and crack evolution characteristics of fissured sandstone. The results show that water has a significant deterioration effect on the compressive strength, elastic modulus and peak strain of the fissured sandstone, and the mechanical parameters show a nearly linear decreasing trend as moisture content increases. The macroscopic failure mode of the fissured sandstone all exhibits H-type tensile-shear mixed failure under different moisture states, and the tensile cracks gradually increase with increasing moisture content, the secondary cracks also propagate mainly in the form of tensile cracks. As moisture content increases, the AE energy counts of fissured sandstone weaken gradually, the cumulative energy curve presents obvious stage characteristics and its distribution characteristics vary significantly with the moisture state. The combination of AE and DIC analysis methods is helpful to reveal the crack evolution law of fissured sandstone from the macro-meso perspective. The crack initiation and propagation orientation can be effectively predicted according to the strain localization zone, and the increase in moisture content speeds up the crack initiation rate and slows down the crack propagation rate in the later stage of loading. The results of micro-crack analysis based on the AE parameters are basically consistent with the macroscopic failure mode. The effect of moisture state on tensile and shear cracks in fissured sandstone varies significantly, with increasing moisture content promoting the development of tensile cracks and thereby inhibiting the development of shear cracks. The research results can provide a reference for the stability evaluation and monitoring of fissured rock under the effect of water.

     

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