不同加载速率下波导杆三点弯曲声发射参数分析*

doi:10.16265/j.cnki.issn1003-3033.2021.10.022

中国安全科学学报 ›› 2021, Vol. 31 ›› Issue (10): 159-166.doi: 10.16265/j.cnki.issn1003-3033.2021.10.022

不同加载速率下波导杆三点弯曲声发射参数分析^*

吴鑫副教授, 王雪梅^**, 罗筱毓, 朱旭, 林华李

四川师范大学工学院,四川成都 610101

收稿日期:2021-07-18 修回日期:2021-09-12 出版日期:2021-10-28 发布日期:2022-04-28
通讯作者: ** 王雪梅(1995—),女,四川眉山人,硕士研究生,研究方向为边坡安全与声发射检测技术。E-mail:1512518115@qq.com。
作者简介:吴鑫 (1983—),男,四川遂宁人,博士,副教授,主要从事矿山岩石力学与安全检测技术等方面的研究。E-mail-xinwu@sicnu.edu.cn。
基金资助:
国家应急管理部安全生产重特大事故防治关键技术项目(sichuan-0011-2018AQ);四川省科技计划项目(19YYJC2854);四川省教育厅重点项目(18ZA0407)。

Analysis of AE parameters of waveguide rod at different loading rates under three-point bending

WU Xin, WANG Xuemei, LUO Xiaoyu, ZHU Xu, LIN Huali

College of Engineering, Sichuan Normal University, Chengdu Sichuan 610101, China

Received:2021-07-18 Revised:2021-09-12 Online:2021-10-28 Published:2022-04-28

摘要/Abstract

摘要： 为探究边坡内部的滑移过程中声发射(AE)信号相关参数的变化特征,预测边坡的滑移速率,开展不同加载速率下砂砾填充有源波导杆三点弯曲试验,分析幅值、b值、振铃计数、能量和主频幅值等AE参数与加载速率的关系。结果表明:AE信号的幅值随着加载速率增加逐渐增大,b值逐渐减小;振铃计数随着加载时间的增加呈线性增加,振铃计数的增长速率随加载速率的增加呈幂函数增加;能量随着加载时间的增加呈指数函数增加;主频幅值随着加载时间和加载速率的增加而增大,主频幅值在低频与中低频段(20~200 kHz)上的变化比较明显。

关键词: 加载速率, 波导杆, 三点弯曲, 声发射(AE), 振铃计数

Abstract: In order to explore change characteristics of AE signal related parameters during sliding process inside slopes, and to predict their sliding rates, three-point bending tests of sand-filled active waveguide rods were carried out under different loading rates. Then, relationship between AE parameters, such as amplitude, b-value, ringing count, energy and main frequency amplitude, and loading rate was analyzed. The results show that amplitude of AE signals increases gradually while b value decreases along with the increase of loading rate. Ringing count increases linearly with the rise of loading time, and its growth rate increases in a power function as loading rate increases, while energy increases in an exponential function with that of loading time. Moreover, main frequency amplitude increases with that of loading time and loading rate, and its changes are more significant in low frequency and middle and low frequency bands (20-200 kHz).

Key words: loading rate, waveguide rod, three-point bending, acoustic emission(AE), ringing count

中图分类号:

X936

吴鑫, 王雪梅, 罗筱毓, 朱旭, 林华李. 不同加载速率下波导杆三点弯曲声发射参数分析^*[J]. 中国安全科学学报, 2021, 31(10): 159-166.

WU Xin, WANG Xuemei, LUO Xiaoyu, ZHU Xu, LIN Huali. Analysis of AE parameters of waveguide rod at different loading rates under three-point bending[J]. China Safety Science Journal, 2021, 31(10): 159-166.

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不同加载速率下波导杆三点弯曲声发射参数分析^*

Analysis of AE parameters of waveguide rod at different loading rates under three-point bending

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