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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摘要为了给工程岩爆破坏预测提供理论依据，在花岗岩岩爆模拟试验过程中，利用2台高速相机同步拍摄到碎屑弹射过程的数字图像。利用双目立体视觉技术对图像数据进行分析处理，得到碎屑的三维坐标和体积2个关键参数，进而求得碎屑的弹射速度。根据实测数据对弹射速度预测的理论模型进行经验修正，具体结论如下：修正模型中的应力衰减常数b服从均值和方差分别为1.53×104和4.83×107的正太分布；经过修正的经验公式相比于原理论公式，未知变量的个数减少1个，只需知道碎屑的质量以及岩爆点对应的静态应力场就能得到碎屑弹射速度的统计分布；大部分岩爆碎屑的质量小于0.25 g，且动能大多数(86%)都集中在长度l＜20 mm的碎屑上。

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	何满潮1
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	何琴琴1

关键词 ：岩石力学, 岩爆破坏预测, 弹射速度修正, 双目高速相机, 双目立体视觉技术

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

引用本文:

何满潮1，2，任富强1，2，宫伟力1，2，何琴琴1. 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[J]. 岩石力学与工程学报, 2017, 36(10): 2341-2349.
HE Manchao1，2，REN Fuqiang1，2，GONG Weili1，2，HE Qinqin1. Modified model for ejection velocity of rock burst fragments based on binocular stereovision technology. , 2017, 36(10): 2341-2349.

链接本文:

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

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