Pressure stimulated current in progressive failure process of combined coal-rock under uniaxial compression: Response and mechanism

IF 11.7 1区工程技术 Q1 MINING & MINERAL PROCESSING

International Journal of Mining Science and Technology Pub Date : 2024-02-01 DOI:10.1016/j.ijmst.2023.12.008

Tiancheng Shan , Zhonghui Li , Xin Zhang , Haishan Jia , Xiaoran Wang , Enyuan Wang , Yue Niu , Dong Chen , Weichen Sun , Dongming Wang

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引用次数: 0

Abstract

Effective monitoring of the structural health of combined coal-rock under complex geological conditions by pressure stimulated currents (PSCs) has great potential for the understanding of dynamic disasters in underground engineering. To reveal the effect of this way, the uniaxial compression experiments with PSC monitoring were conducted on three types of coal-rock combination samples with different strength combinations. The mechanism explanation of PSCs are investigated by resistivity test, atomic force microscopy (AFM) and computed tomography (CT) methods, and a PSC flow model based on progressive failure process is proposed. The influence of strength combinations on PSCs in the progressive failure process are emphasized. The results show the PSC responses between rock part, coal part and the two components are different, which are affected by multi-scale fracture characteristics and electrical properties. As the rock strength decreases, the progressive failure process changes obviously with the influence range of interface constraint effect decreasing, resulting in the different responses of PSC strength and direction in different parts to fracture behaviors. The PSC flow model is initially validated by the relationship between the accumulated charges of different parts. The results are expected to provide a new reference and method for mining design and roadway quality assessment.

查看原文本刊更多论文

单轴压缩下煤岩结合体渐进破坏过程中的压力刺激电流：响应和机理

利用压力激电（PSC）对复杂地质条件下的煤岩组合结构健康状况进行有效监测，对于了解地下工程中的动态灾害具有巨大潜力。为了揭示这种方式的效果，对三种不同强度组合的煤岩组合样品进行了单轴压缩实验。通过电阻率测试、原子力显微镜（AFM）和计算机断层扫描（CT）方法研究了 PSC 的机理解释，并提出了基于渐进破坏过程的 PSC 流动模型。研究强调了渐进破坏过程中强度组合对 PSC 的影响。结果表明，受多尺度断裂特征和电特性的影响，岩石部分、煤炭部分和两个组分之间的 PSC 响应是不同的。随着岩石强度的降低，界面约束效应的影响范围减小，渐进破坏过程发生明显变化，导致不同部位的 PSC 强度和方向对断裂行为的响应不同。通过不同部位累积电荷之间的关系初步验证了 PSC 流模型。研究结果有望为采矿设计和巷道质量评估提供新的参考和方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Mining Science and Technology Earth and Planetary Sciences-Geotechnical Engineering and Engineering Geology

CiteScore

19.10

自引率

11.90%

发文量

2541

审稿时长

44 days

期刊介绍： The International Journal of Mining Science and Technology, founded in 1990 as the Journal of China University of Mining and Technology, is a monthly English-language journal. It publishes original research papers and high-quality reviews that explore the latest advancements in theories, methodologies, and applications within the realm of mining sciences and technologies. The journal serves as an international exchange forum for readers and authors worldwide involved in mining sciences and technologies. All papers undergo a peer-review process and meticulous editing by specialists and authorities, with the entire submission-to-publication process conducted electronically.