Acoustic emission multi-precursor method and device for tension-shear toppling type karst dangerous rock instability early warning

A dumping, acoustic emission technology, applied in the direction of material analysis, measurement device, acoustic presence detection, etc. using acoustic emission technology, can solve problems such as low reliability

Active Publication Date: 2020-11-20
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the problem of the huge hazards of the tension-shear toppling karst dangerous rock instability and collapse disasters and the low reliability of existing early warning methods based on mechanical analysis, numerical calculation, and physical tests, and adopt rock mass rupture acoustic emission signals Monitoring technology means, the information vector machine machine learning method is introduced into the comprehen

Method used

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  • Acoustic emission multi-precursor method and device for tension-shear toppling type karst dangerous rock instability early warning
  • Acoustic emission multi-precursor method and device for tension-shear toppling type karst dangerous rock instability early warning
  • Acoustic emission multi-precursor method and device for tension-shear toppling type karst dangerous rock instability early warning

Examples

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Example Embodiment

[0138] Example 1

[0139] preferably, Image 6 The flow chart of a method for establishing an IVM classification model for comprehensive identification of the stability level of karst dangerous rock in tension-shear dumping with multiple acoustic emission precursors provided by an example of the present invention. This example can be applied to the construction of the IVM classification model for the comprehensive identification of the stability grade of the karst dangerous rock in the pull-shear dumping type. The specific methods include the following:

[0140] Step S1-1: In this embodiment, according to the precursor characteristics of the acoustic emission signal of the pull-shear dumping type karst dangerous rock, four types of pull signal ratio, main frequency band, time fractal dimension of the number of impacts and ringing count rate are selected. , see Table 5 for details. These four indicators contain the waveform, spectrum, activity and other characteristics of roc...

Example Embodiment

[0176] Example 2

[0177] Preferably, Embodiment 2 provides an acoustic emission multi-precursor method for early warning of instability of a tension-shear dumping type karst dangerous rock on the basis of the above-mentioned Embodiment 1, and the method can acquire and analyze the acoustic emission signal of the tension-shear dumping type karst rock. and real-time early warning of instability and collapse disasters. Figure 7 A flow chart of an acoustic emission multi-precursor method for providing early warning of instability of karst dangerous rock with pull-shear dumping type is provided for Embodiment 2 of the present invention, and the method specifically includes the following:

Example Embodiment

[0179] Exemplarily, in Example 2 of the present invention, the acoustic emission sensor installation site features: no excessive cracks, good contact between the interface and the acoustic emission sensor, high degree of stability, and easy manual installation and disassembly;

[0180] In order to ensure the safety of the acoustic emission collector, the cables connected to the acoustic emission collector and each acoustic emission sensor are relatively long, and the installation site of the acoustic emission collector should deviate from the tension-shear dumping karst dangerous rock instability and collapse disaster area .

[0181] Preferably, in this embodiment, in view of the fact that the rock mass rupture scale is relatively large during the instability and collapse evolution of the on-site pulling-shear dumping type of karst dangerous rock, in order to reduce the interference of non-important signals and improve the acquisition of effective signals, an acoustic emission ...

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Abstract

The invention discloses an acoustic emission multi-precursor method and device for tension-shear toppling type karst dangerous rock instability early warning, and aims to solve the problem of automatic early warning of tension-shear toppling type dangerous rock collapse disasters in karst areas. The method comprises the following steps: firstly, formulating a relationship rule between four dangerous rock acoustic emission precursor characteristics and a stability level according to acoustic emission change characteristics of dangerous rock instability precursor; then, collecting four acousticemission precursor characteristics of each stage in the dangerous rock instability process from two ways of an indoor test and an on-site example to serve as a machine learning sample set; and finally, training an information vector machine learning model with excellent adaptability to complex classification problems by utilizing the training sample set. Therefore, a nonlinear mapping relation between the acoustic emission precursor characteristics and the dangerous rock stability is established, quick evaluation of the dangerous rock stability grade in on-line monitoring is further realized,and an evaluation result is transmitted to an early warning information receiving terminal of a dangerous rock manager through an early warning device.

Description

technical field [0001] The invention belongs to the technical field of geological disaster prevention and control engineering, and relates to a method and a device for early warning of tension-shear toppling karst dangerous rock instability and collapse by using acoustic emission signals. Background technique [0002] Dangerous rock refers to a geological body that is cut and separated by multiple groups of structural planes, has poor stability, and may collapse in the form of toppling, falling, and slipping. Tension-shear dumping dangerous rock is a dangerous rock mass separated from the stable parent rock by a steep structural plane on a steep slope. Under the action of gravity and other factors, it usually rotates around the lower end of the main control structural plane or the intersection of the lower end and the free surface. Toppling failure is prone to outward overturning and instability, showing the failure mechanism of tension and shear, see attached figure 1 . ...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06K9/62G06N20/00G01N29/14G01N29/44G01V1/00G01V1/30
CPCG06N20/00G01N29/4472G01N29/14G01V1/001G01V1/306G01N2291/0232G01N2291/0289G06F2218/12G06F18/214
Inventor 苏国韶李培峰许华杰张研罗丹旎黄小华蒋剑青郑志
Owner GUANGXI UNIV
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