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

Pending Publication Date: 2022-02-18
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

[0003] However, the existing acoustic emission technology has insufficient utilization of acoustic emission signals. Usually, only the simplified characteristic parameters of the waveform are used or the research object is focused on the evolution characteristics of the main frequency of acoustic emission and its frequency band ratio. Insufficient consideration of domain diversity and globality, easy to lose important information, difficult to form accurate quantitative evaluation, difficult to achieve effective analysis of rock damage mechanism

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  • Rock failure acoustic emission sub-dominant frequency identification and extraction method
  • Rock failure acoustic emission sub-dominant frequency identification and extraction method
  • Rock failure acoustic emission sub-dominant frequency identification and extraction method

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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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Abstract

The invention relates to a rock failure acoustic emission sub-dominant frequency identification and extraction method. Standard cylindrical samples of rocks with different geological causes are prepared, acoustic emission sensors are uniformly arranged on the side surfaces of the standard cylindrical samples in the circumferential direction, a uniaxial compression experiment is carried out, and the acoustic emission sensors receive original acoustic emission waveforms released in the whole process from the beginning of loading to complete destruction of the rock samples, de-noising processing and fast Fourier transform are carried out on the original acoustic emission waveform in sequence to obtain a two-dimensional spectrogram, and fuzzification processing is carried out to obtain a fuzzified two-dimensional spectrogram; an acoustic emission signal with a secondary dominant frequency characteristic is captured and identified, and an acoustic emission dominant frequency and a secondary dominant frequency of the acoustic emission signal are extracted; acoustic emission signals of different lithologic samples in the whole process from loading to complete destruction are collected, acoustic emission signal frequency domain data of rock damage and destruction moments are obtained, for acoustic emission signals with sub-dominant frequency characteristics, the types of the acoustic emission signals are judged, the center frequency is calculated, and a destruction mode is described in combination with a sample destruction load-time curve.

Description

technical field [0001] The invention relates to a method for identifying and extracting sub-dominant frequency of rock damage acoustic emission, and belongs to the technical field of rock damage pattern recognition. Background technique [0002] The failure of rock materials under load is a complicated and gradual process. Before macro-cracking, multi-characteristic micro-cracking phenomena appeared inside the sample, and there were at least two or more damage mechanisms of tensile cracking and shear-slip in the damage process. When different failure modes occur inside the rock, it will induce the release of corresponding elastic energy, generate elastic waves with different characteristics, and form the acoustic emission signal received by the detection sensor. Acoustic emission technology uses the transient elastic wave information generated by the internal fracture damage of the rock under load to continuously monitor and test the damage progress of the material during t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/02G01N3/06G01N3/08G01N3/24
CPCG01N3/02G01N3/06G01N3/08G01N3/24
Inventor 常新科吴顺川张小强程海勇王焘
Owner KUNMING UNIV OF SCI & TECH
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