| 刘兵,杨义,张洪,黎应康,杨尉廷.层状灰岩力学特性与破裂机制研究[J].贵州地质,2025,42(3):345-352 |
| 层状灰岩力学特性与破裂机制研究 |
| Study on the Geomechanical Properties and Failure Mechanisms of Layered Limestone |
| 投稿时间：2025-05-13 |
| DOI： |
| 中文关键词: 层状灰岩 力学特性 破裂机制 RA-AF 能量加速释放 |
| 英文关键词:Layered limestone Mechanical Properties Fracture mechanism RA-AF Accelerating energy release |
| 基金项目:贵州省地矿局地质科学技术研究项目(编号:黔地矿科合〔2021〕16号)、黔科合基础QN〔2025〕002、贵州省大学生创新创业训练计划项目(gzuxc2024135) |
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| 中文摘要: |
| 为研究层状灰岩力学性质与破裂机制随不同层理倾角(层理面与水平面夹角)的变化特征，室内钻取层理倾角分别为0°、15°、30°、45°、60°、75°、90°的灰岩试样进行单轴压缩试验与声发射监测，并分析了其力学参数、RA-AF(上升时间/振幅-平均频率)值以及能量加速释放现象随倾角的变化规律。结果表明，层状灰岩峰值强度随倾角增加呈现先减小后增大的特征，在45°时达到最低值。当倾角小于45°时，灰岩破裂机制以张拉破裂占主导，剪切破裂占比随倾角增加逐渐增加；当倾角大于45°时，灰岩破裂机制以剪切破裂占主导，张拉破裂占比随倾角增加逐渐增加。灰岩失稳破坏特征随倾角增加呈现突发式失稳破坏-渐进式失稳破坏-突发式失稳破坏的演化特征。 |
| 英文摘要: |
| To study the mechanical properties and fracture mechanism of layered limestone with different bedding angles (the angle between bedding plane and horizontal plane)， uniaxial compression test and acoustic emission (AE) monitoring were carried out on different bedding angles of limestone with 0°， 15°， 30°， 45°， 60°， 75° and 90° respectivelyThe mechanical parameters， values of RA-AF (rise time/amplitude-average frequency ) and the accelerating energy release with different bedding angles were analyzedThe results show that the peak strength of layered limestone decreases first and then increases with the increase of bedding angles， and reaches the lowest value at 45°When the bedding angles was less than 45°， the fracture mechanism of limestone was dominated by the tensile fracture， and the proportion of shear fracture increased gradually with increasing bedding anglesWhen the bedding angles was greater than 45°， the fracture mechanism of limestone was dominated by the shear fracture， and the proportion of tensile fracture increased gradually with increasing bedding anglesWith the increase of bedding angles， the instability failure characteristics of limestone show the evolution characteristics of sudden instability failure - progressive instability failure - sudden instability failure |
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