Rock failure acoustic emission sub-dominant frequency identification and extraction method
An extraction method and acoustic emission technology are applied in the field of identification and extraction of the secondary main frequency of acoustic emission of rock damage, which can solve the problem of insufficient consideration of the diversity and globality of the intrinsic frequency domain of acoustic emission, difficulty in realizing rock damage mechanism analysis, and utilization of acoustic emission signals. Insufficient rate and other problems to achieve the effect of eliminating the influence of human subjective judgment, accurate rock failure mode judgment, and flexible frequency domain data processing
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Embodiment 1
[0062] Embodiment 1: as figure 1 As shown, a method for identifying and extracting sub-dominant frequency of rock damage acoustic emission, the specific steps are as follows:
[0063] (1) Prepare rocks of different geological origins into standard cylindrical samples:
[0064] Rocks of different geological origins include igneous rocks, sedimentary rocks and metamorphic rocks, granite is used as igneous rock samples, sandstone is used as sedimentary rock samples, and marble is used as metamorphic rock samples;
[0065] The size of the sample is a standard cylinder with a diameter of φ50mm×height H100mm; the non-parallel error of the two ends of the sample is less than 0.05mm; the two ends of the sample are perpendicular to the axis, and the deviation is less than 0.25°; the error of the sample diameter along the height is less than 0.3mm;
[0066] (2) Acoustic emission sensors are evenly arranged along the circumferential direction on the side surface of the cylindrical sampl...
Embodiment 2
[0094] Embodiment 2: as figure 1 As shown, a method for identifying and extracting sub-dominant frequency of rock damage acoustic emission, the specific steps are as follows:
[0095] S1. Prepare rocks of different geological origins into standard cylindrical samples; rocks can be divided into igneous rocks, sedimentary rocks and metamorphic rocks according to geological origins, among which granite is selected as the magmatic rock sample, numbered Gra group, and sandstone is used as the sedimentary rock sample , No. San Group, marble as a metamorphic rock sample, No. Mar Group, granite, sandstone and marble are produced in a mining area in Yueyang, Hunan, Ziyang, Sichuan, and Leiyang, Hunan, respectively; End face grinder and other equipment are uniformly processed in the laboratory to prepare a standard cylindrical sample with a diameter of φ50mm x a height of H100mm; the non-parallel error of the two ends of the sample is less than 0.05mm; the two ends of the sample are per...
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