Progressive failure characteristics of coal under uniaxial compression: A comprehensive application of micro-ct and digital volume correlation

IF 3.7 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL Bulletin of Engineering Geology and the Environment Pub Date : 2024-10-01 DOI:10.1007/s10064-024-03915-3

Yanbin Yu, Chuanwen Ni, Wenting Cui, Weimin Cheng, Yongtao Chen

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Abstract

This study examines the failure process of coal under uniaxial compression using in-situ CT scanning with X-ray computed tomography. By integrating digital core technology and digital volume correlation (DVC), the research analyzes the development and evolution of fractures and calculates displacement and strain fields, offering reliable data for understanding failure mechanisms. Additionally, the study simulates fluid seepage within coal under varying loads, revealing the relationship between structural changes and permeability. The findings show that coal under uniaxial loading experiences both fracture development and compression, influenced by axial forces and the development of adjacent fractures. Minerals within coal play a guiding role in fracture development, shaped by their form and distribution. DVC results demonstrate that coal destruction is a dynamic, evolving process driven by deformation differences across regions and directions. Displacement vectors show coal matrix migration in multiple directions, while strain fields reveal lateral fracture expansion under axial compression. As loading progresses, fracture tortuosity decreases, and throat numbers rise to 6353, leading to increased permeability, notably a 149.35 μm² increase at the 1.1kN stage. This study deepens the understanding of coal's destructive characteristics and contributes to mining disaster prevention and control, with significant implications for coal engineering and resource development.

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煤在单轴压缩下的渐进破坏特征：微观ct和数字体积相关性的综合应用

本研究利用原位 CT 扫描和 X 射线计算机断层扫描技术研究了煤炭在单轴压缩下的破坏过程。通过整合数字岩心技术和数字体积相关技术（DVC），该研究分析了裂缝的发展和演变，并计算了位移和应变场，为了解破坏机制提供了可靠的数据。此外，研究还模拟了不同载荷下煤炭内部的液体渗流，揭示了结构变化与渗透性之间的关系。研究结果表明，受轴向力和相邻裂缝发展的影响，单轴荷载下的煤炭会经历裂缝发展和压缩。煤炭中的矿物质在断裂发育过程中起着引导作用，其形态和分布对断裂发育起着决定性作用。DVC 结果表明，煤炭破坏是一个动态的、不断发展的过程，受不同区域和方向的变形差异的驱动。位移矢量显示了煤基质在多个方向上的迁移，而应变场则显示了轴向压缩下断裂的横向扩展。随着加载的进行，断裂迂回度减小，喉管数增加到 6353 个，导致渗透率增加，尤其是在 1.1kN 阶段增加了 149.35 μm2。这项研究加深了人们对煤炭破坏特性的认识，有助于矿难防治，对煤炭工程和资源开发具有重要意义。

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来源期刊

Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合

CiteScore

7.10

自引率

11.90%

发文量

445

审稿时长

4.1 months

期刊介绍： Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.