| 梁鹏,刘俊岭,李壮,何吉民.三点弯曲试验 条件下花岗岩声发射横纵波特征及损伤演化*[J].,2023,42(4):700-709 |
| 三点弯曲试验 条件下花岗岩声发射横纵波特征及损伤演化* |
| Acoustic emission S-wave and P-wave characteristics and damage evolution of granite under three-point bending test |
| 投稿时间：2022-04-20 修订日期：2023-07-05 |
| 中文摘要: |
| 开展花岗岩三点弯曲试验，利用横纵波两种传感器接收花岗岩破坏过程的声发射信号，对比分析声发射横纵波信号的时频特征，在此基础上，基于声发射横纵波建立损伤变量，探讨花岗岩三点弯曲条件下损伤演化规律。研究结果表明：花岗岩破坏过程声发射横纵波事件率变化趋势较为相似，临近峰值载荷时均加速上升，破坏时达到峰值，但纵波事件率加速点早于横波事件率；声发射横纵波能率变化趋势一致，呈现峰前低水平稳定变化、峰后陡升到峰值的特征。声发射横纵波主频在临近峰值载荷逐渐形成主频条带，但其频率存在差异，纵波主频分布在0~10 kHz、30~50 kHz和100~110 kHz，而横波主频集中分布在0~10 kHz。相比纵波损伤变量，横波损伤变量能够刻画峰后损伤急速发展的过程，能较好地表征花岗岩三点弯曲作用下损伤变化规律。 |
| 英文摘要: |
| The three-point bending test of granite was carried out, and acoustic emission signals of granite failure process were received by using S-wave and P-wave sensors. The time-frequency characteristics of S-wave and P-wave signals of acoustic emission signals were compared and analyzed. On this basis, damage variables were established based on acoustic emission S-wave and P-wave to discuss the damage evolution law of granite under three-point bending conditions. The results show that the variation trend of acoustic emission S-wave and P-wave event rates in granite failure process is similar. While approaching the peak load, the AE signal increases rapidly and reaches the peak value when damage occurs. However, the acceleration point of P-wave event rate appears earlier than that of S-wave event rate. The variation trend of S-wave and P-wave energy rate of acoustic emission is consistent, showing the characteristics of stable change at low load before the maxim load and sharp rise to the peak after the maxim load. The dominant frequencies of acoustic emission S-wave and P-wave gradually form several dominant bands near the peak load, but their frequencies are different. The dominant frequencies of P-wave are distributed in 0-10 kHz, 30-50 kHz and 100-110 kHz, while the dominant frequencies of S-wave are concentrated in 0-10 kHz. Compared with the P-wave damage variable, the S-wave damage variable can describe the rapid development process of post-peak damage and better characterize the damage variation law of granite under three-point bending test. |
| DOI：10.11684/j.issn.1000-310X.2023.04.005 |
| 中文关键词: 三点弯曲试验 声发射 横波 纵波 时频特征 损伤演化 |
| 英文关键词: Three-point bending test Acoustic emission S-wave P-wave Time-frequency characteristics Damage evolution |
| 基金项目: |
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