Experimental study on the evolution patterns of bursting liability of hard and brittle sandstone under microwave thermal shock
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摘要: 冲击地压是深部资源开采的主要灾害类型，冲击倾向性是表征冲击地压风险的重要指标。为了探索微波热力冲击对岩石冲击倾向性的影响，本文对典型强冲击倾向性硬脆砂岩开展了微波热力冲击和单轴压缩试验，分析了微波热力冲击后砂岩的物理力学性质和冲击倾向性指标响应规律。研究结果表明：(1)微波作用后，砂岩表面温度随着热力冲击时间增加持续升高，直至150 s发生热破断；(2)微波热力冲击120 s后，砂岩内部结构发生微破裂，岩石冲击倾向性明显减弱，纵波波速与弹性模量分别下降了15.12 %、8 %；(3)单轴压缩变形破坏过程各阶段声发射信号密度增大，砂岩最终破坏时的绝对能量最大值下降42.3 %；(4)岩石动态破坏时间增长了259 %，冲击能量指数减小95 %，弹性能量指数下降92 %，砂岩由强冲击性岩石变为弱冲击性岩石。研究结果为煤炭深部开采冲击地压防治和深地工程高效破岩具有参考价值。Abstract: Rock burst is a major disaster in deep mining, where bursting liability is an important indicator of rock burst risk. This study therefore intends to explore the impact of microwave thermal shock on rocks with strong bursting liability by testing the microwave thermal shock and uniaxial compression of typical hard brittle sandstone and analyzing their physical and mechanical properties and the response of bursting liability indicators after microwave thermal shock. The research results show that: (1) After microwaving, the surface temperature of the sandstone continues to rise with the increase of thermal shock time, until it breaks at 150 s; (2) Microwave thermal shock has a significant effect on the structural damage of sandstone. After 120 s of microwaving, the longitudinal wave velocity and elastic modulus decrease by 15.12 % and 8 % respectively. The AE signal density increases at each stage of uniaxial compression, and the maximum absolute energy at the final destruction of sandstone decreases by 42.3 %; The dynamic failure time of rock increases by 259 %, the impact energy index decreases by 95 %, and the elastic energy index decreases by 92 %. This research offer references for efficient rock breaking in deep earth engineering and prevention and control of rock burst in resource mining.
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Key words:
- rock burst /
- microwave /
- thermal shock /
- bursting liability /
- experimental study
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图 2 微波热力冲击下砂岩表面温度变化
Figure 2. Variation of sandstone surface temperature under microwave thermal shock
图 5 砂岩单轴抗压强度及弹性模量变化规律
Figure 5. Variation of uniaxial compressive strength and elastic modulus of sandstone
图 6 砂岩应力-声发射相关参数随微波热力冲击时间变化特征
Figure 6. Variation of sandstone stress-AE related parameters evolving over microwave thermal shock time
图 7 不同微波热力冲击时间下绝对能量最大值变化规律
Figure 7. Variation of absolute maximum energy under different microwave thermal shock time
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