Experimental Study on Compressive and Tensile Failure Characteristics of Different Rocks
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摘要: 为探究不同岩性岩石在发生破裂时的演化模式，采用声发射监测系统对大理岩、花岗岩、灰岩、砂岩的巴西劈裂试验和单轴压缩试验监测。试验结果表明，巴西劈裂试验应力变化为非线性变化和线性变化，且不同岩石在巴西劈裂破坏时会产生二次破坏；单轴压缩条件下不同岩样在发生破坏时具有典型的全应力–应变曲线特征，声发射参数变化随应力变化较为一致，但不同岩性对于声发射参数的响应存在差异；在劈裂和压缩过程中，振铃计数和撞击计数对于岩石破坏的发生更为敏感，且岩石越坚硬，发生破坏时释放的能量越多。Abstract: The acoustic emission (AE) monitoring system is used to monitor the Brazilian splitting and uniaxial compression of the marble, granite, limestone, and sandstone in order to investigate the evolution pattern of different rocks during fracture. The results show that the stress changes are non-linear and linear and different rocks produce secondary damage in Brazilian splitting tests. The uniaxial compression conditions present typical full stress-strain curve characteristics when damage occurs in different rock samples, and the changes in AE parameters are more consistent with stress changes, but there are differences in the response of different lithologies to AE parameters. The AE counts and AE hits are more sensitive to the rock damage, and the harder the rock is, the more energy is released.
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Key words:
- AE /
- lithology /
- Brazilian splitting /
- uniaxial compression
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表 1 岩样在不同工况下的应力增长速率（应力破坏速率）
MPa/s 试验 大理岩 花岗岩 灰岩 砂岩 巴西劈裂 0.025 0.028 0.024 0.010 单轴压缩 0.050 0.050 0.040 0.020 
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