Strain type rockburst early warning method based on acoustic signal waveform change characteristics

Abstract

The invention provides a strain type rockburst early warning method based on acoustic signal waveform change characteristics. The method includes the following steps: acoustic signals in a strain type rockburst destruction process are collected and transmitted to an acoustic signal processing system, the acoustic signal processing system performs denoising processing first, and then draws and analyzes an acoustic signal oscillogram, main forewarning information of occurrence of rockburst is that after small-amplitude fluctuation of the amplitude of the acoustic signals for a relatively long time, high-amplitude acoustic signals suddenly appear for a short period of time, and soon afterwards, a ''relative quiet period'' of continuous low-amplitude acoustic signals appear; a curve of a time fractal dimension value changing with time is drawn, another piece of forewarning information of occurrence of rockburst is that after continuously increasing to a relatively large value, the value of the time fractal dimensions D<t> continuously declines in a period of time and approaches a historical minimum value; and finally, an alarm is given in the form of sending out high-decibel sound or changing screen graphics. The strain type rockburst early warning method based on acoustic signal waveform change characteristics belongs to a non-contact monitoring means, and has the advantages that the installation operation is safe and the signals are reliable and stable.

Description

technical field [0001] The invention relates to a strain-type rockburst early warning method based on the change characteristics of the sound signal waveform. Specifically, it involves taking the change of the wave form characteristic of the sound signal recognizable by the human ear during the rockburst breeding process as the precursor information of the rockburst. It belongs to the field of early warning and prevention of geotechnical engineering disasters. Background technique [0002] With the rapid development of my country's economy, the country's demand for hydropower, energy, and transportation is increasing, and the amount of underground engineering construction is increasing, and it is gradually expanding to the deep, and the rockburst problem is becoming increasingly prominent. Rockburst is generally a dynamic damage phenomenon of surrounding rock caused by excavation and unloading of underground engineering rock mass in hard rock under high ground stress state. ...

AI Technical Summary

Problems solved by technology

Furthermore, both microseismic and acoustic emission are contact monitoring methods, and the signal strength attenuates rapidly with the increase of the distance from the sound source. Sensors and other equipment are damaged, and there are certain safety hazards during installation

In addition, the microseismic equipment and acoustic emission equipment used for early warning of rockbursts are expensive and have high technical requirements for users.

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