砂岩破坏声发射临界慢化前兆特征试验研究

doi:10.16285/j.rsm.2021.0631

岩土力学 ›› 2022, Vol. 43 ›› Issue (S1): 164-172.doi: 10.16285/j.rsm.2021.0631

砂岩破坏声发射临界慢化前兆特征试验研究

朱星^{1, 2, 3}，刘汉香^{1, 3}，胡桔维^{1, 3}，范杰^{1, 3}

1. 成都理工大学地质灾害防治与地质环境保护国家重点实验室，四川成都 610059；2. 成都理工大学计算机与网络安全学院，四川成都 610059；3. 成都理工大学环境与土木工程学院，四川成都 610059

收稿日期:2021-04-24 修回日期:2022-02-28 出版日期:2022-06-30 发布日期:2022-07-13
作者简介:朱星，男，1984年生，博士，副教授，主要从事滑坡、崩塌等地质灾害智能监测技术与预警方法研究。
基金资助:
国家自然科学基金面上项目（No.41877254）；国家重点研发计划（No.2019YFC1509602）；四川省科技计划项目（No.2019YJ0534）。

Experimental study on precursory characteristics of acoustic emission of sandstone failure based on critical slowing down

ZHU Xing^{1, 2, 3}, LIU Han-xiang^{1, 3}, HU Jie-wei^{1, 3}, FAN Jie^{1, 3}

1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, Sichuan 610059, China; 2. College of Information Science and Technology, Chengdu University of Technology, Chengdu, Sichuan 610059, China; 3. College of Environment and Civil Engineering, Chengdu University of Technology, Chengdu, Sichuan 610059, China

Received:2021-04-24 Revised:2022-02-28 Online:2022-06-30 Published:2022-07-13
Supported by:
This word was supported by the General Program of National Natural Science Foundation of China(41877254), the National Key R&D Program of China(2019YFC1509602) and the Science and Technology Program of Sichuan(2019YJ0534).

摘要/Abstract

摘要：

通过对砂岩岩石试样开展单轴加载压缩下的声发射试验，测试岩石试样在单轴多级加载条件下受力变形全过程的声发射参数，建立时间−荷载−声发射参数关系曲线，分析岩石变形破坏全过程的声发射特征及变化情况，对岩石变形破坏过程声发射特征的自相关系数和方差变异性进行深入分析，揭示岩石变形破坏的临界慢化现象，探索岩石临界破坏的声发射前兆表征。研究结果表明：（1）岩石在逐级加载过程中产生明显的声发射现象，声发射振铃计数随着加载级数增加越来越高，在岩石试样破坏时刻达到最高；（2）利用声发射RA（上升时间/峰值幅度）与AF（平均频率）特征分析，岩石试样在整个过程中以张拉破裂为主，加载后期剪切破裂逐步增多；（3）通过声发射振铃计数率、上升时间、峰值频率、RA主要特征时间序列的方差和自相关分析，发现其分析结果均在岩石破坏前存在突变性，即表明出明显的临界慢化现象，可作为岩石破坏灾变的前兆特征；（4）峰值频率和RA的方差变异可作为岩石损伤破坏的关键前兆指标。鉴于此，将临界慢化现象分析用于脆性岩石破坏过程的研究，对深入认识岩石临界破坏状态和灾变前兆具有非常重要的科学价值和实用意义。

关键词: 岩石破坏, 声发射, 临界慢化现象, 前兆特征

Abstract:

The acoustic emission (AE) test of sandstone rock sample under uniaxial multi-step loading compression were carried out, and the AE signals were observed. The relationship curves of time-stress-AE parameters were established, and the characteristics and evolution laws of AE during the entire loading were analyzed accordingly. With the aim to reveal the critical slowing down phenomenon of rock deformation and failure, the autocorrelation coefficient and variance of AE parameters versus time were analyzed in-depth. The results demonstrate that: (1) the rock produces obvious acoustic emission during the multi-step loading process, and the acoustic emission ringing count becomes higher and higher as the loading level increases, and reaches the highest at the moment of failure of the rock sample; (2) the characteristics of acoustic emission RA(rise time/peak amplitude)-AF(average frequency) indicate that the tensile cracking prevails in the whole loading process, and the shear cracking gradually increases in the later stage of loading; (3) the variance and autocorrelation coefficient of parameters such as AE ringing count, rise time, peak frequency, and RA suddenly increase before the catastrophic failure of rock sample, which indicates that the obvious critical slowing phenomenon appears before rock failure; (4) the variance of peak frequency and RA can be used as key precursor indicators of rock damage and failure. In view of this, applying the analysis of the critical slowing phenomenon to brittle failure process of rock has very important scientific value and practical significance for in-depth understanding of the damage state and the precursors of catastrophic failure of rocks.

Key words: rock failure, acoustic emission, critical slowing down, precursory characteristics

中图分类号:

TU457

朱星, 刘汉香, 胡桔维, 范杰, . 砂岩破坏声发射临界慢化前兆特征试验研究[J]. 岩土力学, 2022, 43(S1): 164-172.

ZHU Xing, LIU Han-xiang, HU Jie-wei, FAN Jie, . Experimental study on precursory characteristics of acoustic emission of sandstone failure based on critical slowing down[J]. Rock and Soil Mechanics, 2022, 43(S1): 164-172.

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砂岩破坏声发射临界慢化前兆特征试验研究

Experimental study on precursory characteristics of acoustic emission of sandstone failure based on critical slowing down

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