Study on the influence of fracture roughness and aperture on water seepage of coal
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摘要: 【目的】 煤层注水是矿井除尘、防治煤与瓦斯突出和冲击地压等灾害的关键技术措施，而裂隙粗糙度、开度等形态特征对煤层注水效果具有显著影响。【方法】 借助砂纸和聚酰亚胺高温胶带制备了含有不同粗糙度和开度裂隙的煤样，利用激光光谱共聚焦显微镜精准计算裂隙粗糙度参数，测试裂隙煤样渗流量。【结果和结论】 结果表明，表面高度偏差Ha、表面最大高度Hz和三维形貌分形维数 Ds 可以作为表征煤剖面粗糙程度的参数。煤体渗流量随Ha、Hz和Ds的升高呈指数降低趋势，随着剖面粗糙度从4.69提高到18.43，裂隙内的渗流量最高下降84.42%。裂隙开度在60~90 μm 时其粗糙度对渗流的阻碍效果达到最高，此后粗糙单元阻碍效果开始减弱，裂隙开度在渗流过程占据主导作用。煤体渗流量随裂隙开度的升高呈指数升高的趋势，裂隙开度由30 μm 提高到 150 μm，裂隙渗流量最高可增大355.88倍。通过对裂隙开度和粗糙度与渗流量关系的深入探究，明确了两者在煤层注水过程中的关键作用机制，强调在煤层注水实践中应充分考虑裂隙形态特征，依据不同的裂隙开度和粗糙度情况合理选择注水方式，以实现煤层注水效果的有效提升。Abstract: [Objective] Coal seam water injection is a key technical measure for dust removal, prevention and control of coal and gas outbursts, and rockburst disasters in mines. The morphological characteristics such as fracture roughness and aperture have a significant impact on the effectiveness of coal seam water injection. [Methods] Fractured coal samples with different roughness and aperture were prepared by means of sandpaper and polyimide high temperature tape. The fracture roughness parameters were accurately calculated by laser spectral confocal microscope, and the seepage flow of fractured coal samples was tested. [Results and Conclusions] The results showed that the surface height deviation (Ha), the maximum surface height (Hz) and the fractal dimension (Ds) of 3D morphology can be used as parameters to characterize the roughness of coal profile. The seepage flow of coal decreases exponentially with the increase of Ha, Hz and Ds. As the roughness of the section increases from 4.69 to 18.43, the seepage flow in the fracture decreases by 84.42%. When the fracture aperture is 60~90 μm, the roughness has the highest blocking effect on the seepage. After that, the blocking effect of the rough element begins to weaken, and the fracture aperture plays a leading role in the seepage process. The seepage flow of coal increases exponentially with the increase of fracture aperture. When the fracture aperture is increased from 30 μm to 150 μm, the seepage flow of fracture can be increased by 355.88 times. This study conducted an in-depth exploration of the relationship between fracture aperture, roughness and seepage flow, clarifying their key mechanisms in the process of coal seam water injection. It emphasizes that in coal seam water injection practice, fracture morphology should be fully considered, and water injection methods should be reasonably selected based on different fracture opening and roughness conditions to effectively improve the effectiveness of coal seam water injection.
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Keywords:
- coal /
- fracture aperture /
- fracture roughness /
- fracture roughness characterization /
- seepage flow /
- dust removal
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