Rock damage prediction method based on acoustic emission source dominant frequency uniqueness

A prediction method and acoustic emission technology, which is applied in the direction of using acoustic emission technology for material analysis, processing response signals of detection, etc., which can solve the problems of blurred emission source, main frequency bandwidth of acoustic emission, lack of established main frequency and acoustic emission source, etc.

Active Publication Date: 2020-11-03
JIANGXI UNIV OF SCI & TECH
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Problems solved by technology

[0018] This technology does not establish the corresponding relationship between the main frequency of the acoustic emission waveform and the acoustic emission source, that is, the corresponding relationship between tensile micro-cracks, shear micro-cracks and mixed micro-cracks, directly calculating the main frequency of acoustic emission will lead to The acoustic emission source corresponding to the source of the main frequency of the acoustic emission is vague, the main frequency of the acoustic emission is broad, and the characteristics of the main frequency or main frequency band of the acoustic emission are not significant

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  • Rock damage prediction method based on acoustic emission source dominant frequency uniqueness
  • Rock damage prediction method based on acoustic emission source dominant frequency uniqueness
  • Rock damage prediction method based on acoustic emission source dominant frequency uniqueness

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Embodiment Construction

[0107] The specific technical solutions of the present invention are described in conjunction with the examples. This embodiment takes the uniaxial compressive strength test as an example.

[0108] Preparation of S1 Standard Rock Specimen

[0109] Specimens were prepared according to the "Standards for Test Methods of Engineering Rock Mass" (GB / T50266-2013). Test specimens may be prepared from drilled core or rock blocks. Take a cylinder with a standard diameter of 50mm and a height of 100mm as an example. The instruments and equipment required for specimen preparation include: coring machine, cutting machine, grinding stone machine, etc. Among them, the coring machine is used to drill cores with a diameter of 50mm and a height greater than 100mm. The cutting machine is used to cut the drilled core to obtain a cylindrical core with a diameter of 50mm and a height slightly greater than 100mm. The stone grinding machine is used to grind the end face of the cut cylinder core...

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Abstract

The invention provides a rock damage prediction method based on acoustic emission source dominant frequency uniqueness. The rock damage prediction method comprises the steps of preparation of a standard rock test piece, acoustic emission source positioning, acoustic emission source type identification, calculation of acoustic emission dominant frequencies corresponding to different types of sources and rock damage prediction. According to the method, the defects of wide acoustic emission main frequency band and non-obvious acoustic emission main frequency characteristics of an existing rock damage prediction method based on acoustic emission main frequency characteristics are overcome. The method is suitable for predicting rock damage in Brazilian splitting tests, shearing tests and creeptests under uniaxial and triaxial compression conditions.

Description

technical field [0001] The invention belongs to the technical field of rock failure prediction, and in particular relates to a rock failure prediction method based on the uniqueness of the dominant frequency of an acoustic emission source. Background technique [0002] At present, more than 1 / 3 of the well shafts with a depth of more than 700m in various mines in my country have entered the implementation stage of the development and utilization of deep mineral resources. The development of many metal mines has exceeded a kilometer, and a new batch of large-scale mines over a kilometer is being planned and developed. under construction. Deep mining has become the new normal of mining enterprises, a new challenge of mining technology and a new development of the mining industry. Therefore, in the process of deep well mining, it is of great engineering value and practical significance to predict engineering geological disasters induced by rock (body) failure. [0003] When ro...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/14G01N29/44G01N29/48
CPCG01N29/14G01N29/44G01N29/48
Inventor 龚囱赵奎曾鹏赵坤包涵杨道学王万银
Owner JIANGXI UNIV OF SCI & TECH
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