岩土力学 ›› 2019, Vol. 40 ›› Issue (1): 135-146.doi: 10.16285/j.rsm.2017.1017

• 基础理论与实验研究 • 上一篇    下一篇

不同高度花岗岩岩爆试验的声发射特征

赵 菲1,王洪建1,何满潮2,袁广祥1,罗耀武1   

  1. 1. 华北水利水电大学 地球科学与工程学院,河南 郑州 450045;2. 中国矿业大学 深部岩土力学与地下工程国家重点实验室,北京 100083
  • 收稿日期:2017-05-22 出版日期:2019-01-11 发布日期:2019-01-30
  • 作者简介:赵菲,女,1986年生,博士,讲师,主要从事岩石力学方面的教学与研究工作
  • 基金资助:
    国家自然科学基金项目(No. U1704243,No. 51704120,No. 41807254,No. 41402269);深部岩石力学与地下工程国家重点实验室开放基金项目(No. SKLGDUEK1524);华北水利水电大学高层次人才启动经费资助项目(No. 40467,No. 40583)。

Acoustic emission characteristics of granite specimens with different heights in rockburst tests

ZHAO Fei1, WANG Hong-jian1, HE Man-chao2, YUAN Guang-xiang1, LUO Yao-wu1   

  1. 1. College of Geosciences and Engineering, North China University of Water Resources and Electric Power, Zhengzhou, Henan 450045, China; 2. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Beijing 100083, China
  • Received:2017-05-22 Online:2019-01-11 Published:2019-01-30
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (U1704243, 51704120, 41807254, 41402269), the Open Fund of the State Key Laboratory for Geomechanics and Deep Underground Engineering (SKLGDUEK1524) and the High-level Research Fund of the North China University of Water Resources and Electric Power (40467, 40583).

摘要: 岩石尺寸是影响其力学行为的重要因素,而岩爆是岩石处于复杂应力状态下的特殊力学响应,因此研究岩爆过程中的尺寸效应影响问题具有重要意义。利用室内改进的真三轴仪(简称MTTA)岩爆模拟试验系统和美国物理声学公司(简称PAC)声发射(AE)监测系统,对具有不同高度的花岗岩进行室内岩爆模拟试验,观察岩石试件破坏特征,分析花岗岩试件岩爆过程中声发射信号的参数特征、波形频谱特征。研究结果表明,随着岩石试件高度的降低,岩爆临界破坏强度有升高的趋势。岩石岩爆破坏后破裂面特征随着试件高度的降低而发生明显变化,经历了由劈裂张拉破坏为主向剪切破坏为主破坏模式的转变。同时,试验中表征损伤的声发射能率参数随着试件高度的降低有增大的趋势,即释能速度越来越快。对试验各典型阶段产生的AE特征波形进行提取并采用快速傅里叶变换方法处理,对比频谱图发现,花岗岩岩爆试验过程声发射主频值总体呈“从低频向高频再向低频”转变迁移的趋势,不同高度岩石岩爆试验结果有着相似的谱分布,主频主要集中在90~120 kHz低频区间范围,是该花岗岩岩爆中的最重要特征频率,频谱特征中的高频部分受试件高度的影响而有不同。

关键词: 岩爆试验, 花岗岩, 不同高度, 声发射, 频谱特征

Abstract: Rock size is an important factor influencing its mechanical behavior. Rock burst is a special mechanical response of rock under complex stress conditions. The study of size effect on rock behavior in rock burst is of great importance. A modified true-triaxial apparatus and acoustic emission (AE) monitoring system made by Physical Acoustics Corporation are used to perform laboratory rockburst simulation tests on granite specimens with different heights. The fracture characteristics of rock are observed, and the AE waveforms spectra characteristics are studied. The experimental results indicate that the critical failure stress of rock samples has an increasing trend as the sample height decreases. The fracture surface characteristics of rock after rockburst have undergone a transition from splitting tension failure to shear failure with the decrease of specimen height. Meanwhile, AE energy rate, which can reflect rock damage, increases gradually as the sample height decreases, indicating faster release rate of AE energy. Using fast Fourier transform (FFT) to process extracted waveform files at typical stages, it can be found that rock samples with different heights have a similar variation in the major frequency, which transits from low frequency to high frequency and finally back to low frequency. The most important characteristic frequency, is located in the lower frequency ranges of 90~120 kHz. The high frequency part of the spectrum characteristics varies with the height of the specimen.

Key words: rockburst test, granite specimen, different heights, acoustic emission, spectra characteristics

中图分类号: 

  • TU 452
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