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利用自制落锤式煤岩冲击加载试验装置对原煤与型煤试件分别进行冲击加载试验,并借助核磁共振分析仪获得冲击加载后煤样的T_2谱分布,以分析冲击荷载作用次数、单次冲击能量大小、冲击能量加载顺序、冲击能量的累计效果等因素对煤样内部微结构数量、尺度的影响。结果表明:型煤与原煤试件T_2谱分布存在一定的差异,动力冲击使原煤与型煤试件的微结构数量、尺度均有不同程度的增加,且原煤试件增幅更为明显;煤样内部微结构总数量随着冲击次数、单次冲击能量的增加均呈非线性变化,整体上随着冲击次数的增加呈“高速增加–平缓发展–急速增加”三段式变化,而随着单次冲击能量的增加呈增速越来越快的变化;由于冲击能量阈值与冲击能量吸收率2个相反因素在耦合作用,冲击能量的累计效果可能随单次冲击能量的增加呈先增加后减小变化,冲击能量的累计不能等效为冲击能量的增加;煤样内部微结构总数量对冲击能量由大到小进行加载更为敏感,在工程现场可通过调整施工顺序来达到高效改造储层等目的。
The self-made drop-weight coal-rock impact loading test device was used to carry out impact loading tests on raw coal and briquette samples, respectively. The T_2 spectrum of coal samples after impact loading was obtained by means of nuclear magnetic resonance analyzer to analyze the impact loading times, The impact of energy size, impact energy loading sequence, the cumulative impact of impact energy and other factors on the number and scale of the microstructure of coal samples. The results show that the distribution of T_2 spectra of briquette samples is different from that of coal samples. The dynamic impact makes the number and scale of microstructure of briquette and briquette samples increase in different degrees, and the increase of coal samples is more obvious. The total number of internal microstructures varied nonlinearly with the number of impacts and the increase of single impact energy. The overall number of microstructures showed a three-step change of “high speed increase-gentle development-rapid increase” with the increase of impact times, As the impact energy threshold and the impact energy absorption rate of the two opposite factors in the coupling, the cumulative impact energy impact may increase with a single impact energy was increased first After the change, the cumulative impact energy can not be equivalent to the increase of impact energy. The total amount of microstructure inside the coal sample is more sensitive to the impact energy loading from large to small. In the project site, Reservoir and other purposes.