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

发布时间：2018-05-20 14:40

  本文选题：岩石力学 + 岩爆破坏预测　； 参考：《岩石力学与工程学报》2017年10期

【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1.53×10~4和4.83×10~7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l20 mm的碎屑上。
[Abstract]:In order to provide theoretical basis for the prediction of rockburst damage in engineering, the digital images of clastic ejection process were simultaneously captured by two high-speed cameras during the simulation test of granite rockburst. Using binocular stereo vision technology to analyze and process the image data, two key parameters of the debris's 3D coordinate and volume are obtained, and then the ejection velocity of the debris is obtained. According to the measured data, the theoretical model of ejection velocity prediction is modified empirically. The concrete conclusions are as follows: the stress attenuation constant b in the modified model is the positive distribution of the mean value and variance of 1.53 脳 10 ~ (4) and 4.83 脳 10 ~ (7), respectively; Compared with the original theoretical formula, the modified empirical formula reduces the number of unknown variables by one, and the statistical distribution of ejection velocity can be obtained only by knowing the mass of the clastic and the static stress field corresponding to the rock burst point. The mass of most rock burst detritus is less than 0.25 g, and most of the kinetic energy is concentrated on the l20 mm long debris.
【作者单位】： 中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室;中国矿业大学(北京)力学与建筑工程学院;
【基金】：国家重点研发计划与发展专项(2016YFC0600901)~~
【分类号】：TU45
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本文编号：1915071