Strength Evolution Characteristics of Coal with Different Pore Structures and Mineral Inclusions Based on CT Scanning Reconstruction

IF 4.8 2区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Natural Resources Research Pub Date : 2024-08-16 DOI:10.1007/s11053-024-10397-3

Cun Zhang, Sheng Jia, Zhaopeng Ren, Qingsheng Bai, Lei Wang, Penghua Han

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Abstract

Water–rock interactions affect mineral inclusions and the pore structure of rock, subsequently affecting its mechanical and seepage properties. A method for quantitative analysis of the pore and mineral inclusion evolution characteristics of coal samples based on CT scanning is proposed. Accordingly, numerical model construction and block division of mineral inclusions and pores in coal samples were realized. The effects of mineral inclusions and the pore structure on coal failure were simulated and analyzed. The results showed that the porosity and pore distribution in coal influence its strength. The development of plastic zones in coal affected by pores can be divided into three stages: (1) tensile failure initiation stage, (2) shear failure penetration stage, and (3) failure rapid expansion stage. The higher the fractal dimension of the pores is, the greater the strength of coal. Pores and mineral inclusions degrade the strength of coal and accelerate the development of plastic zones. In the loading process, plastic zones preferentially emerge around pores and mineral inclusions. The plastic zones around mineral inclusions connect gradually with those around pores, thus accelerating coal failure.

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基于 CT 扫描重建的不同孔隙结构和矿物夹杂物煤炭的强度演变特征

水与岩石的相互作用会影响岩石中的矿物包裹体和孔隙结构，进而影响岩石的力学和渗流特性。本文提出了一种基于 CT 扫描定量分析煤样孔隙和矿物包裹体演化特征的方法。据此，实现了煤样中矿物包裹体和孔隙的数值模型构建和区块划分。模拟并分析了矿物夹杂物和孔隙结构对煤炭失效的影响。结果表明，煤中的孔隙率和孔隙分布影响煤的强度。煤中受孔隙影响的塑性区的发展可分为三个阶段：（1）拉伸破坏起始阶段；（2）剪切破坏渗透阶段；（3）破坏快速扩展阶段。孔隙的分形维数越高，煤的强度越大。孔隙和矿物夹杂物会降低煤的强度，加速塑性区的形成。在加载过程中，塑性区优先出现在孔隙和矿物夹杂物周围。矿物夹杂物周围的塑性区与孔隙周围的塑性区逐渐相连，从而加速了煤的破坏。

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来源期刊

Natural Resources Research Environmental Science-General Environmental Science

CiteScore

11.90

自引率

11.10%

发文量

151

期刊介绍： This journal publishes quantitative studies of natural (mainly but not limited to mineral) resources exploration, evaluation and exploitation, including environmental and risk-related aspects. Typical articles use geoscientific data or analyses to assess, test, or compare resource-related aspects. NRR covers a wide variety of resources including minerals, coal, hydrocarbon, geothermal, water, and vegetation. Case studies are welcome.