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研究煤的破坏过程对于理解其力学行为及渗透性能的变化至关重要。利用X射线计算机断层扫描(CT)技术,在单轴压缩条件下对煤岩进行原位扫描。结合数字岩心技术和数字体积相关法(Digital Volume Correlation, DVC),计算了煤岩的变形位移场与应变场,分析了裂隙的发育与演化规律,并揭示了煤岩损伤动态演化与渗透性能之间的响应关系。研究发现:在单轴荷载作用下,煤岩的破坏由轴向力与相邻裂隙的发育共同作用,导致内部既有裂隙发育,又有裂隙压密的现象;煤岩中的矿物质对裂隙发育有引导作用,且与矿物质的形状和分布密切相关。DVC分析表明,煤岩的破坏是一个动态演化过程,各区域在不同方向的变形差异积累导致破坏发生;位移场的矢量叠加揭示了煤基质在不同方向的变形,而应变场显示裂隙在轴向压缩下的横向扩展。加载过程中,煤岩孔裂隙的发育导致渗透性能不断提高,特别是在1 100N阶段,渗透率增加了149.35μm2,损伤变量DH的最大值为8.2%。此外,连通孔隙数和迂曲度τ与损伤变量成指数关系。研究结果可为理解煤岩破坏和渗透特性提供试验数据和理论支持。
Abstract：The study of the damage process of coal is essential to understand the changes of their mechanical behaviour and permeability properties. X-ray computed tomography(CT) was used to scan the coal rock in situ under uniaxial compression conditions. Combining the digital core technology and digital volume correlation method(DVC), the deformation displacement field and strain field of the coal rock were calculated. The fracture development and evolution law, the relationship between the dynamic evolution of coal rock damage and the permeability performance were analyzed. It is found that under uniaxial loading, the damage of the coal rock is caused by a combination of axial force and the development of adjacent fractures, resulting in the development of internal fractures and the phenomenon of fracture compaction. In addition, the minerals in the coal play a guiding role in fracture development, and the fractrue development are closely related to the shape and distribution of minerals. The DVC analysis shows that the damage process of the coal is a dynamic evolutionary process, and the accumulation of deformation difference along different directions in each region leads to the occurrence of damage. The vector superposition of the displacement field reveals the deformation of the coal matrix in different directions, while the strain field shows the lateral expansion of the fracture under axial compression. During the loading process, the development of pore fracture in coal results in the increase of permeability properties,especially at the 1 100 N stage, where the permeability increased by 149.35 μm2 and the maximum value of the damage variable DH was 8.2%. In addition, the number of connected pores and tortuosity τ were exponentially related to the damage variables. This study provides experimental data and theoretical support to deepen the understanding of the damage and permeability characteristics of coal.
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基本信息:
DOI：10.13532/j.jmsce.cn10-1638/td.2024-1318
中图分类号:TD315
引用信息:
[1]于岩斌,尼传文,崔文亭,等.基于Micro-CT和DVC的单轴压缩下煤岩损伤特征研究[J].采矿与岩层控制工程学报,2025,7(03):68-81.DOI:10.13532/j.jmsce.cn10-1638/td.2024-1318.
基金信息:
国家自然科学基金资助项目(52074171,51934004); 山东省自然科学基金优秀青年基金资助项目(ZR2023YQ047); 山东省泰山学者工程专项经费资助项目(TS20190935,TSQN202408180); 山东省高等学校青创科技计划创新团队资助项目(2021KJ010)