本文選題：巖石力學(xué) + 巖爆破壞預(yù)測(cè)��； 參考：《巖石力學(xué)與工程學(xué)報(bào)》2017年10期

【摘要】：為了給工程巖爆破壞預(yù)測(cè)提供理論依據(jù),在花崗巖巖爆模擬試驗(yàn)過程中,利用2臺(tái)高速相機(jī)同步拍攝到碎屑彈射過程的數(shù)字圖像。利用雙目立體視覺技術(shù)對(duì)圖像數(shù)據(jù)進(jìn)行分析處理,得到碎屑的三維坐標(biāo)和體積2個(gè)關(guān)鍵參數(shù),進(jìn)而求得碎屑的彈射速度。根據(jù)實(shí)測(cè)數(shù)據(jù)對(duì)彈射速度預(yù)測(cè)的理論模型進(jìn)行經(jīng)驗(yàn)修正,具體結(jié)論如下:修正模型中的應(yīng)力衰減常數(shù)b服從均值和方差分別為1.53×10~4和4.83×10~7的正太分布;經(jīng)過修正的經(jīng)驗(yàn)公式相比于原理論公式,未知變量的個(gè)數(shù)減少1個(gè),只需知道碎屑的質(zhì)量以及巖爆點(diǎn)對(duì)應(yīng)的靜態(tài)應(yīng)力場(chǎng)就能得到碎屑彈射速度的統(tǒng)計(jì)分布;大部分巖爆碎屑的質(zhì)量小于0.25 g,且動(dòng)能大多數(shù)(86%)都集中在長(zhǎng)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.
【作者單位】： 中國(guó)礦業(yè)大學(xué)(北京)深部巖土力學(xué)與地下工程國(guó)家重點(diǎn)實(shí)驗(yàn)室;中國(guó)礦業(yè)大學(xué)(北京)力學(xué)與建筑工程學(xué)院;
【基金】：國(guó)家重點(diǎn)研發(fā)計(jì)劃與發(fā)展專項(xiàng)(2016YFC0600901)~~
【分類號(hào)】：TU45
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本文編號(hào)：1915071