基于双目立体视觉技术的岩爆碎屑弹射速度理论修正模型

doi:10.13722/j.cnki.jrme.2017.0954

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Abstract The aim of this paper is to provide a theoretical basis for rock burst failure prediction. The digital images of fragments ejection were captured by two high-speed cameras during the tests on granite rock burst. The binocular stereovision technology was used to obtain three-dimensional(3D) coordinates and volumes of fragments. Two key parameters were utilized to calculate the ejection velocities of fragments. The theoretical model calculating the ejection velocity was modified according to the measured values. It was found that the stress attenuation constant b obeyed the normal distribution，with the mean and variance 1.53×104 and 4.83×107 respectively. The modified formula have one unknown variable less than the unmodified model. That is to say，if the mass of fragments and static stress state at burst point are known，the statistical distribution of ejection velocity can be obtained. The mass of most of the ejected fragments is less than 0.25 gram. The statistical result shows that the kinetic energy of fragments，with length l＜20 mm，is dominant(more than 86%).

Key words： rock mechanics rock burst failure prediction modified ejection velocity binocular high-speed camera binocular stereovision technology

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	Articles by authors
	HE Manchao1
	2
	REN Fuqiang1
	2
	GONG Weili1
	2
	HE Qinqin1

Cite this article:

HE Manchao1,2,REN Fuqiang1, et al. Modified model for ejection velocity of rock burst fragments based on binocular stereovision technology[J]. , 2017, 36(10): 2341-2349.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2017.0954 OR http://www.rockmech.org/EN/Y2017/V36/I10/2341

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