Mechanical properties and acoustic emission characteristics of soft rock with different water contents under dynamic disturbance

IF 6.9 1区 工程技术 Q2 ENERGY & FUELS International Journal of Coal Science & Technology Pub Date : 2024-05-04 DOI:10.1007/s40789-024-00682-0
Yujing Jiang, Lugen Chen, Dong Wang, Hengjie Luan, Guangchao Zhang, Ling Dong, Bin Liang
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Abstract

Uniaxial compression tests and cyclic loading acoustic emission tests were conducted on 20%, 40%, 60%, 80%, dry and saturated muddy sandstone by using a creep impact loading system to investigate the mechanical properties and acoustic emission characteristics of soft rocks with different water contents under dynamic disturbance. The mechanical properties and acoustic emission characteristics of muddy sandstones at different water contents were analysed. Results of experimental studies show that water is a key factor in the mechanical properties of rocks, softening them, increasing their porosity, reducing their brittleness and increasing their plasticity. Under uniaxial compression, the macroscopic damage characteristics of the muddy sandstone change from mono-bevel shear damage and ‘X’ type conjugate bevel shear damage to a roadway bottom-drum type damage as the water content increases. Dynamic perturbation has a strengthening effect on the mechanical properties of samples with 60% and less water content, and a weakening effect on samples with 80% and more water content, but the weakening effect is not obvious. Macroscopic damage characteristics of dry samples remain unchanged, water samples from shear damage and tensile–shear composite damage gradually transformed into cleavage damage, until saturation transformation monoclinic shear damage. The evolution of acoustic emission energy and event number is mainly divided into four stages: loading stage (I), dynamic loading stage (II), yield failure stage (III), and post-peak stage (IV), the acoustic emission characteristics of the stages were different for different water contents. The characteristic value of acoustic emission key point frequency gradually decreases, and the damage degree of the specimen increases, corresponding to low water content—high main frequency—low damage and high water content—low main frequency—high damage.

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不同含水率软岩在动态扰动下的力学性能和声发射特性
利用蠕变冲击加载系统对 20%、40%、60%、80%、干燥和饱和泥质砂岩进行了单轴压缩试验和循环加载声发射试验,以研究不同含水率软岩在动态扰动下的力学性能和声发射特性。分析了不同含水量泥质砂岩的力学性能和声发射特性。实验研究结果表明,水是影响岩石力学性能的关键因素,它能软化岩石,增加岩石的孔隙率,降低岩石的脆性,增加岩石的可塑性。在单轴压缩条件下,随着含水量的增加,泥质砂岩的宏观破坏特征从单斜面剪切破坏和 "X "型共轭斜面剪切破坏转变为巷道底鼓式破坏。动态扰动对含水量为 60% 及以下的样品力学性能有增强作用,对含水量为 80% 及以上的样品力学性能有减弱作用,但减弱作用不明显。干样的宏观损伤特征保持不变,水样由剪切损伤和拉剪复合损伤逐渐转变为劈裂损伤,直至饱和转变为单斜剪切损伤。声发射能量和事件数的演变主要分为四个阶段:加载阶段(I)、动态加载阶段(II)、屈服破坏阶段(III)和峰值后阶段(IV),不同含水率下各阶段的声发射特征不同。声发射关键点频率特性值逐渐减小,试样的破坏程度增加,对应于低含水率-高主频-低破坏和高含水率-低主频-高破坏。
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来源期刊
CiteScore
11.40
自引率
8.40%
发文量
678
审稿时长
12 weeks
期刊介绍: The International Journal of Coal Science & Technology is a peer-reviewed open access journal that focuses on key topics of coal scientific research and mining development. It serves as a forum for scientists to present research findings and discuss challenging issues in the field. The journal covers a range of topics including coal geology, geochemistry, geophysics, mineralogy, and petrology. It also covers coal mining theory, technology, and engineering, as well as coal processing, utilization, and conversion. Additionally, the journal explores coal mining environment and reclamation, along with related aspects. The International Journal of Coal Science & Technology is published with China Coal Society, who also cover the publication costs. This means that authors do not need to pay an article-processing charge.
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