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Effects of Cyclic Loading on the Pore Structure of Anthracite Coal

机译：循环载荷对无烟煤孔隙结构的影响

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摘要

In the process of improving coalbed permeability through pulse hydraulic fracturing, the cyclic loading effect influences the characteristics of micropores in coal matrix, thus affecting the process of gas migration. Therefore, it is essential to investigate the effect of cyclic loading on the pore structure of coal. Seven groups of loading tests at different frequencies and amplitudes were conducted on anthracite coal obtained from Shanxi Province, China, using a fatigue-testing machine. Subsequently, using a PoreMaster GT-60 Mercury-intrusion apparatus, the influence of the frequency and amplitude on the structural characteristics (including mercury-injection and mercury-ejection curves, pore size distribution, porosity, and specific surface area) of pores in coal samples was analyzed. Finally, the law and mechanism of action of the loading frequency and amplitude on pores in coal samples were comprehensively analyzed. The test results showed that, in the case of maintaining the sine-wave amplitude unchanged during loading while altering the loading frequency, the overall porosity and pore volume rise at different degrees. The growth of the loading frequency presents a more significant promotive effect on the initiation and development of pores and fractures. Moreover, it drives the transformation of micropores and transition pores into mesopores and macropores, thus increasing the proportion of seepage pores. Under the condition of large sine-wave amplitude during loading, macropores and mesopores are subjected to the repeated action of the external force, thereby reducing the overall porosity. In addition, the volume of the seepage pores declines, and the number of the coalesced pores decreases. Finally, in light of these results, the implications of frequency and amplitude selection in the process of pulse hydraulic fracturing are discussed. Therefore, the results of this research will provide an important theoretical basis for the field application of pulse hydraulic fracturing technology in coal mines.
机译：在通过脉冲水力压裂改善煤层气的过程中，循环负载效果影响煤基质中微孔的特性，从而影响气体迁移过程。因此，必须研究循环载荷对煤的孔结构的影响。使用疲劳试验机，在山西省获得的无烟煤煤中进行了七组加载试验。随后，使用Poremaster GT-60汞入侵设备，频率和振幅对煤中孔隙的结构特征（包括汞注射和汞 - 喷射曲线，孔径分布，孔隙率，孔隙率和比表面积）的影响分析样品。最后，综合分析了煤样中装载频率和振幅的作用法和机制。测试结果表明，在在装载期间保持正弦波振幅不变的情况下，在改变装载频率的同时，整体孔隙率和孔体积在不同程度上升高。装载频率的生长对孔隙和骨折的起始和发育具有更大的促进作用。此外，它驱动微孔的转化和过渡孔进入中孔和大孔，从而增加渗流孔的比例。在装载期间大的正弦波振幅的条件下，大孔和中孔经受外力的重复作用，从而降低了整体孔隙率。此外，渗流孔的体积下降，聚结孔的数量减少。最后，鉴于这些结果，讨论了频率和幅度选择在脉冲水力压裂过程中的影响。因此，该研究的结果将为脉冲水力压裂技术在煤矿中的田间应用提供重要的理论依据。

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