Damage evolution process and damage precursor law under cyclic splitting action of different types of rocks

IF 1.3 4区 工程技术 Q3 ENGINEERING, GEOLOGICAL Quarterly Journal of Engineering Geology and Hydrogeology Pub Date : 2023-07-17 DOI:10.1144/qjegh2022-067
K. Zhao, Wenqiang Ao, Yajing Yan, Yichen Shi, Jun Wu, Lijie Guo, Lang Liu
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Abstract

During the construction of underground projects, different types of rock are often in a cyclic state of loading and unloading. Therefore, cyclic fracturing experiments on metamorphic sandstone, slate and granite from one mine site. Based on the basic parameters of acoustic emission(AE), the damage processes and damage precursor patterns of different types of rock samples are analysed. The results of the study show that there is basically no AE signal generated during the unloading phase of the first two cycles of loading, and less acoustic emission signal is generated in the loading stage; In the experimental process of different types of rock samples, when the value of CV( r ) is larger, it can be considered as large scale crack dominance; small scale crack dominance when the value of CV( r ) is small, and CV( r ) values are more accurate than AE b-values in determining the pattern of cracking within a rock sample. With different internal crack development during cyclic splitting, can focus on the changes in the AE loading energy ratio and CV( r ) values before damage destabilization occurs. The Felicity ratio, CV( r ) value and loading energy ratio can be used in combination in practical engineering to improve the accuracy of determining rock stability.
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不同类型岩石循环劈裂作用下的损伤演化过程及损伤前兆规律
在地下工程施工过程中,不同类型的岩石往往处于荷载和卸载的循环状态。因此,对某矿区变质砂岩、板岩和花岗岩进行了循环压裂实验。基于声发射的基本参数,分析了不同类型岩石样品的损伤过程和损伤前兆模式。研究结果表明,在前两个加载周期的卸载阶段基本上没有产生AE信号,在加载阶段产生的声发射信号较少;在不同类型岩石样品的实验过程中,当CV(r)值较大时,可以认为是大规模裂纹优势;当CV(r)的值小时的小尺度裂纹优势,并且在确定岩石样品内的裂纹模式时,CV(r(r)值比AE b值更准确。随着循环劈裂过程中内部裂纹的不同发展,可以关注损伤失稳发生前AE加载能量比和CV(r)值的变化。Felicity比、CV(r)值和加载能量比可以在实际工程中结合使用,以提高岩石稳定性的确定精度。
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来源期刊
CiteScore
3.40
自引率
14.30%
发文量
66
审稿时长
6 months
期刊介绍: Quarterly Journal of Engineering Geology and Hydrogeology is owned by the Geological Society of London and published by the Geological Society Publishing House. Quarterly Journal of Engineering Geology & Hydrogeology (QJEGH) is an established peer reviewed international journal featuring papers on geology as applied to civil engineering mining practice and water resources. Papers are invited from, and about, all areas of the world on engineering geology and hydrogeology topics. This includes but is not limited to: applied geophysics, engineering geomorphology, environmental geology, hydrogeology, groundwater quality, ground source heat, contaminated land, waste management, land use planning, geotechnics, rock mechanics, geomaterials and geological hazards. The journal publishes the prestigious Glossop and Ineson lectures, research papers, case studies, review articles, technical notes, photographic features, thematic sets, discussion papers, editorial opinion and book reviews.
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