摘要
研究分析破裂过程不同阶段的声发射信号频率特性,对于选出相应谐振频率的声发射传感器具有重要意义。通过单轴压缩试验,结果表明:花岗岩受压过程中主要经历3个受力阶段,声发射振铃计数率随相对应力的增加呈现出阶段性的变化规律,声发射信号优势频率主要发生在岩石破裂前塑性破坏和主破裂阶段,且集中在41～85kHz。在相对应力较低时,花岗岩声发射信号频率以低频为主,随着相对应力的增加,其高频、低频信号密集且幅值很大,因此高频高幅值声发射信号的突然增多预示花岗岩有破坏危险。
It is significant for us to do some research on AE signal frequency characteristics at different stages in the fracture process in order to select proper AE sensors with corresponding resonant frequencies. Through uniaxial compression test of granite, the result is shown that in the entire compression process, the rock experienced three stages; the ring count presented periodical changing regulation accompanying with the increasing of relative stress, and also the dominant frequencies of AE signals mainly took place at the plastic breaking stage ofpre-mainfracture and mainfracture stage, focusing on 41 - 85 kHz. When relative stress is low, low-frequency signals of granite dominate; With the increasing of relative stress, the low-frequency and high-frequency signals of granite become intensive of which the amplitudes are relatively huge as well. Accordingly, sudden increasing of high-frequency and high-amplitude AE signal predicts potential peril of breaking of granite.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2012年第A01期2900-2905,共6页
Chinese Journal of Rock Mechanics and Engineering
基金
国家高技术研究发展计划(863)项目(2008AA062104)
国家重大基础研究发展计划(973)项目(2010CB226803)
国家自然科学基金资助项目(51174015)
关键词
岩石力学
冲击倾向性岩石
声发射
频率特征
相对应力水平
rock mechanics
rock burst tendentiousness
acoustic emission（AE）
frequency characteristic
relativestress level
