微波处理后饱水煤岩冲击破坏的试验研究
Experiment study on water-saturated coals after microwave treatment under impact loading
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摘要: 利用分离式霍普金森压杆装置（SHPB）结合高速摄影设备研究了微波加热0、50、125、200 s后饱水煤样力学参数上的变化、动态加载过程中裂纹的发展以及冲击破碎后的块度特征。研究表明：微波加热对饱水煤岩的作用具有时间效应；加热125 s后煤样的峰值应力和峰值应变下降幅度较大，并且破碎后的块度更加均匀和细碎；此外，微波加热的时间越长，煤岩就越早发生破碎；出现上述现象的原因是煤岩中的水分在微波的作用下快速汽化，随着加热的进行煤样内部的蒸汽压力不断上升并在加热125 s后达到最大，造成煤岩内部孔隙和微裂隙的发育和扩张，从而导致煤样动态力学性能的劣化。Abstract: The water-saturated coal samples were heated by microwave for 0 s, 50 s, 125 s and 200 s, respectively. After that, a test system consisting of SHPB and high-speed photography apparatus was adopted to study the variation of mechanical parameters, the development of cracks during dynamic loading and the characteristics of breaking lumpiness. The research results showed that, microwave heating had time effect on the damage of water-saturated coal rock. After heating for 125 s, the peak stress and peak strain of coal sample decreased greatly, and the lumpiness after breaking was more uniform and finely. In addition, the longer the microwave heating period, the earlier the coal rock will break up. The reason for the above phenomenon is that the moisture in the coal rock vaporizes rapidly stimulated by microwaves. With the process of heating, the steam pressure inside the coal sample rises continuously and reaches its maximum after heating for 125 s, resulting in the development and expansion of pores and micro-cracks inside the coal rock, thus leading to the deterioration of the mechanical properties of the coal sample.
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Keywords:
- water-saturated coal /
- impact loading /
- microwave heating /
- SHPB /
- high-speed photography /
- time effect /
- mechanical property
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