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Propagation Characteristics Experiment Study of Stress Wave in Anchor Based on Pseudo-Random Signal

Author: FengLi
Tutor: ChengJiuLong
School: Shandong University of Science and Technology
Course: Earth Exploration and Information Technology
Keywords: Pseudo-Random Signal Anchor Detection Stress Wave Propagation Characteristics Signal Analysis
CLC: TD353.6
Type: Master's thesis
Year: 2009
Downloads: 283
Quote: 2
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Abstract


Anchor anchorage is important mean of all kinds underground engineering and slope nursing, has widely application and vigorously extension, however, evaluation of its construction quality is current difficult problem. Destructive detecting method inspect anchoring quality have obviously limitation, and non-destructive detecting method is continuously summarizing and perfecting, at present, It has some problem of theory and practice ,should be solved by study.The paper analyzed and summarized conventional anchor detecting method, aim at its deficiency, put forward pseudo-random signal detecting method, analyzed difference pseudo-random signal from conventional stress wave method, respectively analyzed signal of different incentive source and same incentive source random exciting by correlation analysis method, summarized feature of pseudo-random signal, and analyzed practicality of two types of signal. Through experiment study, proved the feasibility of pseudo-random signal detecting method. Through spectrum analysis for stress wave signal was collected in the experiment, compared spectrum between head wave signal and the whole record signal, indicated that pseudo-random signal in anchor showed continuously attenuation characteristic.According to feature of wavelet function and anchor testing signal, select db6 wavelet to carry out multiple scale decomposition , analyzed and compared several kinds wavelet filtering method, The results show that using de-noising method of modulus maximum recognized the reflected signal effectively. Polarization analysis method is applied to analyze the three component data, combined the Polarization characteristics of wave, realized recognition of different type wave in anchor. Finally, pseudo-random signal is used to test simulating casting anchor, five simulating casting anchor test results indicates that as the casting intensity increases wave velocity of corresponding casting part decrease, dominant frequency of corresponding testing signal increase but increasing range decrease, meanwhile, carried out contrast test of anchors with different casting length and got good effect. The results show that anchor nondestructive testing, based on pseudo-random signal, can test the geometric parameter and stress stage of anchor with high precision.

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CLC: > Industrial Technology > Mining Engineering > Mine the pressure and support > Mine support equipment > Roadway support > Bolt support
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