Experimental study on failure precursory characteristics and moisture content effect of pre-cracked rocks under graded cyclic loading and unloading

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

International Journal of Mining Science and Technology Pub Date : 2025-02-01 DOI:10.1016/j.ijmst.2024.12.014

Wei Zhang , Dongxiao Zhang , Weiyao Guo , Baoliang Zhang

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引用次数: 0

Abstract

It is important to analyze the damage evolution process of surrounding rock under different water content for the stability of engineering rock mass. Based on digital speckle correlation (DSCM), acoustic emission (AE) and electromagnetic radiation (EMR), uniaxial hierarchical cyclic loading and unloading tests were carried out on sandstones with different fracture numbers under dry, natural and saturated water content, to explore the fracture propagation, failure precursor characteristics and damage response mechanism under the influence of water content effect. The results show that with the increase of water content, the peak stress and crack initiation stress decrease gradually, and the decreases are 15.28%–21.11% and 17.64%–23.04%, respectively. The peak strain and crack initiation strain increase gradually, and the increases are 19.85%–44.53% and 19.15%–41.94%, respectively. The precracked rock with different water content is mainly characterized by tensile failure at different loading stages. However, with the increase of water content, the proportion of shear cracks gradually increases, while acoustic emission events gradually decrease, the dissipative energy and energy storage limits of the rock under peak load gradually decrease, and the charge signal increases significantly, which is because the lubrication effect of water reduces the friction coefficient between crack surfaces.

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分级循环加载和卸载下预开裂岩石的破坏前兆特征和含水量效应实验研究

分析不同含水率下围岩的损伤演化过程对工程岩体的稳定具有重要意义。基于数字散斑相关（DSCM）、声发射（AE）和电磁辐射（EMR）技术，对不同裂缝数的砂岩在干燥、自然和饱和含水量条件下进行单轴分层循环加卸载试验，探讨含水率效应影响下裂缝扩展、破坏前兆特征及损伤响应机制。结果表明：随着含水率的增加，峰值应力和裂纹起裂应力逐渐减小，减小幅度分别为15.28% ~ 21.11%和17.64% ~ 23.04%；峰值应变和裂纹起裂应变逐渐增大，增幅分别为19.85% ~ 44.53%和19.15% ~ 41.94%。不同含水率的预裂岩在不同加载阶段主要表现为拉伸破坏。但随着含水率的增加，剪切裂纹的比例逐渐增加，声发射事件逐渐减少，峰值荷载下岩石的耗散能和蓄能极限逐渐减小，电荷信号明显增加，这是由于水的润滑作用降低了裂纹表面之间的摩擦系数。

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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.