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

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 . ...

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 comprehensive early warning of the instability and collapse of the tension-shear dumping karst dangerous rock based on the multiple precursor characteristics of the acoustic emission signal, and a method of early warning of the instability of the tension-shear dumping karst dangerous rock is proposed. Acoustic emission multi-precursor method and device to effectively realize reasonable early warning of tension-shear toppling karst dangerous rock instability and collapse disasters

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