干湿循环作用下炭质页岩声发射特征试验研究
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(长沙理工大学 土木工程学院,湖南 长沙 410114)

作者简介:

刘新喜(1963—),男,长沙理工大学教授,博士研究生导师。E-mail:liuxinxi1963@126.com

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TU45

基金项目:

国家自然科学基金资助项目(51674041);长沙理工大学研究生科研创新项目(SJCX202025)


Experimental study on acoustic emission characteristics of carbonaceous shale affected dry-wet cycling process
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(School of Civil Engineering,Changsha University of Science & Technology,Changsha 410114, China)

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    摘要:

    为研究干湿循环对炭质页岩力学特性的影响,开展了在不同干湿循环作用下的炭质页岩单轴压缩试验,并采用声发射技术监测其受载过程中的声发射信号。研究结果表明:干湿循环会加速岩石的初始损伤,随着干湿循环次数的增加,岩样的峰值强度和弹性模量呈递减趋势,声发射峰值振铃计数和累计振铃计数逐渐减小;声发射振铃计数呈现平静期、发展期、爆发期和跌落期四个阶段,与应力-应变特征具有较好的一致性。因此,可以将声发射峰值振铃计数作为岩石破坏前兆的依据。

    Abstract:

    To study the influence of dry-wet cycles on mechanical properties of carboniferous shale, uniaxial compression tests were carried out under different dry-wet cycles, and acoustic emission signals were monitored synchronously during the loading process. Research shows that: the dry-wet cycle promoteed the initial damage of the rock. the peak strength and elastic modulus of the rock sample decreased with increasing dry-wet cycles; the peak ringing count and cumulative ringing count of rock samples gradually decreased with increasing dry-wet cycles. The acoustic emission ringing count showed four phases:a quiet period, a developmental period, a bursting period, and a falling period, which were in good agreement with the stress-strain characteristics, and the peak acoustic emission ringing count can be used as a precursor to rock failure.

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引用本文

刘新喜,董蓬,李玉.干湿循环作用下炭质页岩声发射特征试验研究[J].交通科学与工程,2023,39(6):40-47.
LIU Xinxi, DONG Peng, LI Yu. Experimental study on acoustic emission characteristics of carbonaceous shale affected dry-wet cycling process[J]. Journal of Transport Science and Engineering,2023,39(6):40-47.

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  • 收稿日期:2021-11-16
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  • 在线发布日期: 2024-01-16
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