Shaft lining vibration and surrounding rock damage control after freezing shaft blasting

doi:10.16265/j.cnki.issn1003-3033.2021.09.010

Abstract

Abstract: In order to address problems of shaft lining vibration and surrounding rock damage caused by blasting of freezing shaft, shaft lining vibration was monitored in real time and frozen walls' formed images after blasting were taken. Then, TQWT (Tunable Q-factor Wavelet Transform) was used to refine features of vibration signals, ACM (Active Contour Model) and RFA(Random Forest Algorithms) were adopted to analyze shaping effect of surrounding rock for controlled blasting with slotted cartridge charge, and feature recognition and scientific classification of rock images under different blasting conditions were carried out. The results show that vibration of shaft lining and damage of surrounding rock can be effectively reduced by optimizing blasting parameters. Controlled blasting technology with slotted cartridge charge has effects of vibration reduction, shaft lining protection and damage reduction, and the higher Prussian coefficient of rock is, the better application effect of slotted charge blasting will be.

Key words: vertical shaft blasting, frozen wall, slotted cartridge charge, shaft lining vibration, surrounding rock damage

CLC Number:

X936

FU Xiaoqiang, YU Jin. Shaft lining vibration and surrounding rock damage control after freezing shaft blasting[J]. China Safety Science Journal, 2021, 31(9): 67-74.

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