Acoustic Emission Parameters of Three Gorges Sandstone during Shear Failure

IF 2 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Acta Geophysica Pub Date : 2016-12-28 DOI:10.1515/acgeo-2016-0094
Jiang Xu, Yixin Liu, S. Peng
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引用次数: 11

Abstract

In this paper, an experimental investigation of sandstone samples from the Three Gorges during shear failure was conducted using acoustic emission (AE) and direct shear tests. The AE count rate, cumulative AE count, AE energy, and amplitude of the sandstone samples were determined. Then, the relationships among the AE signals and shearing behaviors of the samples were analyzed in order to detect micro-crack initiation and propagation and reflect shear failure. The results indicated that both the shear strength and displacement exhibited a logarithmic relationship with the displacement rate at peak levels of stress. In addition, the various characteristics of the AE signals were apparent in various situations. The AE signals corresponded with the shear stress under different displacement rates. As the displacement rate increased, the amount of accumulative damage to each specimen decreased, while the AE energy peaked earlier and more significantly. The cumulative AE count primarily increased during the post-peak period. Furthermore, the AE count rate and amplitude exhibited two peaks during the peak shear stress period due to crack coalescence and rock bridge breakage. These isolated cracks later formed larger fractures and eventually caused ruptures.
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三峡砂岩剪切破坏过程中的声发射参数
采用声发射(AE)和直剪(direct - shear)两种方法对三峡库区砂岩试样进行了剪切破坏试验研究。测定了砂岩样品的声发射计数率、累积声发射计数、声发射能量和振幅。然后,分析声发射信号与试样剪切行为之间的关系,以检测微裂纹的萌生和扩展,反映剪切破坏。结果表明:在峰值应力水平下,抗剪强度和位移均与位移率呈对数关系;此外,不同情况下声发射信号的不同特征也很明显。不同位移速率下的声发射信号与剪切应力相对应。随着位移速率的增大,各试件累积损伤量减小,声发射能量峰值出现的时间更早、更显著。累积声发射数主要在峰后增加。声发射计数率和幅值在峰值剪应力期出现两个峰值,分别为裂缝聚结期和岩桥断裂期。这些孤立的裂缝后来形成了更大的裂缝,最终导致破裂。
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来源期刊
Acta Geophysica
Acta Geophysica 地学-地球化学与地球物理
CiteScore
3.90
自引率
13.00%
发文量
251
审稿时长
5.3 months
期刊介绍: Acta Geophysica is open to all kinds of manuscripts including research and review articles, short communications, comments to published papers, letters to the Editor as well as book reviews. Some of the issues are fully devoted to particular topics; we do encourage proposals for such topical issues. We accept submissions from scientists world-wide, offering high scientific and editorial standard and comprehensive treatment of the discussed topics.
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