Numerical simulation of stress and permeability evolution in damaged coal

IF 2.8 3区工程技术 Q2 MECHANICS

International Journal of Non-Linear Mechanics Pub Date : 2024-11-13 DOI:10.1016/j.ijnonlinmec.2024.104953

Xianghe Gao , Feng Gao , Ning Zhang , Hongmei Cheng , Yan Xing

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引用次数: 0

Abstract

Mining disturbance is the underlying cause of dynamic disasters such as coal-rock deformation, gas outbursts, and roof water inrush. Mining disturbance leads to damage in coal-rock structures and closely relates to stope cracks' distribution characteristics. Therefore, it is crucial to investigate the coupling effects of the stress field, damage field, and seepage field of coal. Firstly, we established a mechanical model considering the coupling effect of damage and elastoplasticity, which aimed to describe the softening process of coal-rock mechanical parameters and the mutation law of the permeability coefficient in the damage process. Next, we developed a pore-fracture fractal model of damaged coal. It was used to elucidate the inherent relationship between damage and pore-fracture characteristics in the process of coal-rock crushing. We then proposed a quantitative evaluation method for determining the permeability characteristics of coal under the influence of mining disturbances. Finally, a numerical simulation of damaged coal ‘s mechanical behavior and seepage characteristics under stress-seepage coupling was conducted. The development model's effectiveness was verified through comparison with experimental results. In summary, our research offered a solid scientific foundation for quantitative evaluation and accurate prediction of the evolution law of coal-rock permeability characteristics under the influence of mining disturbance.

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受损煤炭中应力和渗透率演变的数值模拟

采动扰动是煤岩变形、瓦斯突出、顶板涌水等动力灾害的根本原因。开采扰动导致煤岩结构破坏，并与斜坡裂缝分布特征密切相关。因此，研究煤的应力场、破坏场和渗流场的耦合效应至关重要。首先，我们建立了考虑损伤与弹塑性耦合效应的力学模型，旨在描述损伤过程中煤岩力学参数的软化过程和渗透系数的突变规律。接着，我们建立了受损煤的孔隙-断裂分形模型。该模型用于阐明煤岩破碎过程中损伤与孔隙-断裂特征之间的内在关系。然后，我们提出了确定煤炭在采矿扰动影响下透气性特征的定量评价方法。最后，对应力-渗流耦合作用下受损煤的力学行为和渗流特性进行了数值模拟。通过与实验结果的对比，验证了开发模型的有效性。总之，我们的研究为定量评价和准确预测采矿扰动影响下煤岩透气性特征的演变规律提供了坚实的科学基础。

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来源期刊

International Journal of Non-Linear Mechanics 物理-力学

CiteScore

5.50

自引率

9.40%

发文量

192

审稿时长

67 days

期刊介绍： The International Journal of Non-Linear Mechanics provides a specific medium for dissemination of high-quality research results in the various areas of theoretical, applied, and experimental mechanics of solids, fluids, structures, and systems where the phenomena are inherently non-linear. The journal brings together original results in non-linear problems in elasticity, plasticity, dynamics, vibrations, wave-propagation, rheology, fluid-structure interaction systems, stability, biomechanics, micro- and nano-structures, materials, metamaterials, and in other diverse areas. Papers may be analytical, computational or experimental in nature. Treatments of non-linear differential equations wherein solutions and properties of solutions are emphasized but physical aspects are not adequately relevant, will not be considered for possible publication. Both deterministic and stochastic approaches are fostered. Contributions pertaining to both established and emerging fields are encouraged.