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<p>The identification of tensile and shear cracks during the rock failure process can help deepen the understanding of the damage mechanisms and failure precursor information of the rock. The scatter plot method of acoustic emission (AE) <i>RA-AF'k</i>' value is commonly used to identify the tensile and shear cracks of the&#xa0;rock, but the existing methods cannot establish the relationship between the loading process and the crack initiation and propagation of the rock samples. Therefore, a new method, named as crack classification energy accumulation curve method ( CCEAC) is proposed based on AE energy. This method combines the <i>RA</i>—<i>AF</i> crack classification method with AE energy and establishes the relationship between the initiation and propagation process of tensile and shear cracks and the loading process of the rock sample by taking time as a link. The reliability of this method is verified by comparing the results of this method and that of kernel density estimation ( KDE) method and cumulative sum method. To verify the practicability and usability, this method is used to analyze the initiation and propagation of the tensile and shear cracks of the bolt-grouting reinforced red sandstone samples containing prefabricated fracture with dip angles of 15°, 30°, 45°, 60°, 75°, and 90° under uniaxial compression. The conclusion obtained by this method is verified by the results observed from the high-speed camera. The results obtained by virtue of this method show that the prefabricated fracture with dip angles of 30°, 45°, and 60° have an inducing effect on the initiation of shear cracks. Each of the cumulative crack energy curves of these three types of samples has a sudden rise and several jump points. The overall failure mode of bolt-grouting reinforced red sandstone samples containing prefabricated fracture with different angle is a tensile shear failure The research of this paper enriches the <i>RA-AF</i> data processing methods and provides a new method for the identification of initiation and propagation of tensile and shear cracks during rock loading.</p>

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A new method for identifying the initiation and propagation of tensile and shear cracks of rock samples based on acoustic emission energy

  • 期刊论文

  • 发表日期：

    2025年5月28日

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  • Shuxue Ding,
  • Zeyu Li,
  • Shuren Wang,
  • Jing Qiao,
  • Hua Nan,
  • Yibo Chen,
  • Lei Xu

摘要

The identification of tensile and shear cracks during the rock failure process can help deepen the understanding of the damage mechanisms and failure precursor information of the rock. The scatter plot method of acoustic emission (AE) RA-AF'k' value is commonly used to identify the tensile and shear cracks of the rock, but the existing methods cannot establish the relationship between the loading process and the crack initiation and propagation of the rock samples. Therefore, a new method, named as crack classification energy accumulation curve method ( CCEAC) is proposed based on AE energy. This method combines the RA—AF crack classification method with AE energy and establishes the relationship between the initiation and propagation process of tensile and shear cracks and the loading process of the rock sample by taking time as a link. The reliability of this method is verified by comparing the results of this method and that of kernel density estimation ( KDE) method and cumulative sum method. To verify the practicability and usability, this method is used to analyze the initiation and propagation of the tensile and shear cracks of the bolt-grouting reinforced red sandstone samples containing prefabricated fracture with dip angles of 15°, 30°, 45°, 60°, 75°, and 90° under uniaxial compression. The conclusion obtained by this method is verified by the results observed from the high-speed camera. The results obtained by virtue of this method show that the prefabricated fracture with dip angles of 30°, 45°, and 60° have an inducing effect on the initiation of shear cracks. Each of the cumulative crack energy curves of these three types of samples has a sudden rise and several jump points. The overall failure mode of bolt-grouting reinforced red sandstone samples containing prefabricated fracture with different angle is a tensile shear failure The research of this paper enriches the RA-AF data processing methods and provides a new method for the identification of initiation and propagation of tensile and shear cracks during rock loading.