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<p>In order to explore the effect of moisture content on the fracture mechanical behavior and acoustic emission (AE) evolution characteristics of red sandstone Mode I and II. The fracture toughness of 24 red sandstone samples with different moisture content (dry, natural and saturated) was determined by the fracture test of Cracked Chevron Notched Brazilian Disc (CCNBD). The results showed that: Fracture toughness of red sandstone decreases as an exponential function of increasing water content. The K<sub>IIC</sub> and initial crack initiation direction of red sandstone can be determined by the generalised maximum stress criterion (GMTS) and Mode I. The RA-AF value of AE signal can better reflect the propagation of shear cracks and tension cracks in the samples under different moisture content. The non-uniform distribution of microscopic defects inside the red sandstone specimen results in a large number of tensile cracks in the CCNBD specimen during the Mode II fracture process.</p>

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Fracture mechanical behavior and acoustic emission evolution characteristics of red sandstone under different moisture conditions

  • 期刊论文

  • 发表日期：

    2025年4月7日

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  • Hao Liu,
  • Congming Li,
  • Yanda Li,
  • Kui Zhao,
  • Daoxue Yang,
  • Wen Zhong,
  • Qixiong Gu

摘要

In order to explore the effect of moisture content on the fracture mechanical behavior and acoustic emission (AE) evolution characteristics of red sandstone Mode I and II. The fracture toughness of 24 red sandstone samples with different moisture content (dry, natural and saturated) was determined by the fracture test of Cracked Chevron Notched Brazilian Disc (CCNBD). The results showed that: Fracture toughness of red sandstone decreases as an exponential function of increasing water content. The KIIC and initial crack initiation direction of red sandstone can be determined by the generalised maximum stress criterion (GMTS) and Mode I. The RA-AF value of AE signal can better reflect the propagation of shear cracks and tension cracks in the samples under different moisture content. The non-uniform distribution of microscopic defects inside the red sandstone specimen results in a large number of tensile cracks in the CCNBD specimen during the Mode II fracture process.