锚杆质量无损检测中的缺陷信息提取方法研究
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摘要
针对锚杆底部弱反射波信息难以提取的问题,按照现行规范要求的测试技术对岩体模型锚杆进行试验,运用希尔波特变换技术对试验数据进行处理,提取"三瞬信息"。分析结果认为,利用三瞬信息能有效提取缺陷反射波信息,尤其是瞬时频率能较好地拾取反射波的到达时间,极大地提高了锚杆长度评价的准确性。
Aiming at the problem of finding weak reflection signal from the bottom of the anchor,we carried out test on anchor model in accordance with current technique specification,and extracted three instantaneous information,i.e.instantaneous frequency,instantaneous amplitude,and instantaneous phase by the Hilbert transform.Result of the test indicates that the three instantaneous information is effective at picking up the reflection wave information,especially the instantaneous frequency can effectively extract the arrival time of reflection wave,which remarkably enhances the accuracy of anchor length evaluation.
Aiming at the problem of finding weak reflection signal from the bottom of the anchor,we carried out test on anchor model in accordance with current technique specification,and extracted three instantaneous information,i.e.instantaneous frequency,instantaneous amplitude,and instantaneous phase by the Hilbert transform.Result of the test indicates that the three instantaneous information is effective at picking up the reflection wave information,especially the instantaneous frequency can effectively extract the arrival time of reflection wave,which remarkably enhances the accuracy of anchor length evaluation.
引文
[1]DL/T5424—2009,水电水利工程锚杆无损检测规程[S].北京:中国电力出版社,2009.(DL/T5424—2009,Code for Anchor Bolt Non-destructive Detection inHydropower and Water Resources Engineering[S].Bei-jing:China Electric Power Press,2009.(in Chinese))
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[2]王成,恽寿榕.应力波理论在动测锚杆锚固质量中的应用[J].地震工程与工程振动,2000,25(2):160-163.(WANG Cheng,YUN Shou-rong.Application ofStress Wave Theory to Dynamic Measurement of BoltBonding Integrity[J].Earthquake Engineering and Engi-neering Vibration,2000,25(2):160-163.(in Chi-nese))
[3]汪天翼,王法刚,肖国强.水工工程锚杆注浆密实度无损检测试验及工程应用[J].岩土工程界,2004,7(6):87-90.(WANG Tian-yi,WANG Fa-gang,XIAOGuo-qiang.Non-destructive Detection Test of Anchor Boltin Hydraulic Project and Engineering Application[J].Geological Exploration for Non-ferrous Metals,2004,7(6):87-90.(in Chinese))
[4]戴前伟,杨汉军,冯德山,等.探地雷达数据的解析信号分析及应用[J].西部探矿工程,2007,(3):130-131.(DAI Qian-wei,YANG Han-jun,FENG De-shan,et al.Analysis and Application of Analytic Signal ofGround Penetrating Radar Data[J].West China Explora-tion Engineering,2007,(3):130-131.(in Chinese))
[5]马玉华,林文华.解析信号的瞬时相位与原始信号的等价关系[J].黑龙江大学自然科学学报,1995,12(3):56-60.(MA Yu-hua,LIN Wen-hua.EquivalenceRelation Between the Instantaneous Phase and OriginalSignal of Analytic Signal[J].Journal of Natural Scienceof Heilongjiang University,1995,12(3):56-60.(inChinese))
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