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。
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).
作者
吴鑫
王雪梅
罗筱毓
朱旭
林华李
WU Xin;WANG Xuemei;LUO Xiaoyu;ZHU Xu;LIN Huali(College of Engineering,Sichuan Normal University,Chengdu Sichuan 610101,China)
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2021年第10期159-166,共8页
China Safety Science Journal
基金
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)。
关键词
加载速率
波导杆
三点弯曲
声发射(AE)
振铃计数
loading rate
waveguide rod
three-point bending
acoustic emission(AE)
ringing count
