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    • Fracture Development Patterns and Micro–Macrostructural Fractal Characteristics of Acid–Base Coal Samples

    Changhao Shan,Qiangling Yao,Shenggen Cao,Qiang Xu,Chuangkai Zheng,Ze Xia,Yinghu Li,Lun Yan

    NATURAL RESOURCES RESEARCH（2024）

    China University of Mining and Technology

    Cited 4|Views13
    Abstract
    This study employed a comprehensive approach utilizing X-ray diffraction, scanning electron microscopy (computed), computed tomography (CT) three-dimensional scanning, uniaxial compressive testing, acoustic emission (AE), and digital image correlation to investigate the micromorphology, mechanical properties, macro–microscopic fractal characteristics, failure modes, and mineral composition changes in acid–base coal samples from underground reservoirs. The findings from this study indicate that, in acidic environments, calcite undergoes acidolysis to form calcium chloride (CaCl2), whereas kaolinite reacts with alkaline substances to produce albite (Na2Al2Si2O8). The average elastic modulus of the coal samples treated with strong acids or alkalis decreased by 51.08
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    Key words
    Underground reservoirs,Acidic and alkaline coal samples,CT scanning,Acoustic emission,Fractal dimension,Digital image correlation
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    要点：该论文通过综合方法研究了酸碱煤样品的微观形态、力学性能、宏观-微观分形特性、破裂模式和矿物组成变化。研究发现，强酸或强碱处理后，煤样品的弹性模量显著降低，断裂阈值降低，切应力集中在高剪切应变区域，增强了宏观碎裂有序性。
    

    方法：使用X射线衍射、扫描电子显微镜、计算机断层摄影（CT）三维扫描、单轴压缩试验、声发射（AE）和数字图像相关等方法。
    

    实验：使用地下储层的酸碱煤样品，结果表明在酸性环境下，方解石发生酸解反应生成氯化钙（CaCl2），而高岭石与碱性物质反应生成钠长石（Na2Al2Si2O8）。强酸或者强碱处理后，煤样品的弹性模量分别降低了51.08%和38.17%，断裂阈值降低了约60%。CT图像显示在更高的H+浓度下，切割断裂的分形维数增大，表明断裂的无序性增强。
    

    数据集名称：未提及
    

    创新点：本研究对西北地区酸碱煤矿的大坝或煤柱安全评估具有重要意义，尤其可以预测其稳定性。