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巖體爆破綜合實(shí)驗(yàn)研究系統(tǒng)及其應(yīng)用

發(fā)布時(shí)間:2018-02-04 01:46

  本文關(guān)鍵詞: 毫秒延時(shí)爆破 臺(tái)階爆破 裂紋擴(kuò)展 應(yīng)力場 超動(dòng)態(tài)應(yīng)變儀 高速攝影 出處:《礦冶工程》2017年02期  論文類型:期刊論文


【摘要】:為定量分析研究毫秒延時(shí)爆破破巖過程特征物理量分布演化機(jī)制,進(jìn)一步優(yōu)選爆破參數(shù)、完善毫秒延時(shí)破巖機(jī)理,進(jìn)行了室內(nèi)毫秒延時(shí)臺(tái)階爆破相似模型實(shí)驗(yàn)。應(yīng)用高速攝影機(jī)和超動(dòng)態(tài)應(yīng)變儀建立綜合實(shí)驗(yàn)研究系統(tǒng),對毫秒延時(shí)爆破進(jìn)行動(dòng)態(tài)實(shí)時(shí)監(jiān)測,得到臺(tái)階自由面處裂紋擴(kuò)展規(guī)律和延時(shí)時(shí)間對邊坡表面應(yīng)力峰值及內(nèi)部應(yīng)力場疊加的影響程度。結(jié)果表明,確保后序藥包起爆時(shí)已形成新自由面的最小臨界延時(shí)為9 ms;設(shè)計(jì)延時(shí)為15 ms或25 ms時(shí),可降低對邊坡表面應(yīng)變峰值影響程度;為促進(jìn)相鄰炮孔爆炸應(yīng)力波充分疊加、增強(qiáng)巖體破碎效果,孔間延時(shí)最大臨界值為15 ms。綜合考慮坡體應(yīng)力狀態(tài)及臺(tái)階爆破效果雙重因素,實(shí)驗(yàn)條件下最優(yōu)孔間延時(shí)為15 ms。
[Abstract]:In order to quantitatively study the distribution and evolution mechanism of physical quantity in the rock breaking process of millisecond delay blasting, the blasting parameters are further optimized and the mechanism of millisecond delay rock breaking is improved. The similar model experiment of millisecond delay bench blasting was carried out. A comprehensive experimental research system was established by using high speed camera and super dynamic strain gauge, and the dynamic real time monitoring of millisecond delay blasting was carried out. The influence of crack propagation law and delay time on the peak stress of slope surface and the superposition of internal stress field are obtained. Ensure that the minimum critical delay of the new free surface formed by the priming of the reordered charge is 9 Ms; When the design delay is 15ms or 25ms, the influence degree on the peak value of slope surface strain can be reduced. In order to promote the full superposition of blast stress waves in adjacent holes and enhance the effect of rock mass breakage, the maximum critical value of interhole delay is 15 Ms. The double factors of slope stress state and bench blasting effect are considered synthetically. The optimal interhole delay is 15 Ms under experimental conditions.
【作者單位】: 武漢科技大學(xué)理學(xué)院;中鐵港航-武科大爆破技術(shù)研究中心;武漢爆破有限公司;
【基金】:國家自然科學(xué)基金(51574184) 湖北省教育廳科學(xué)技術(shù)研究項(xiàng)目(Q20161101) 武漢科技大學(xué)青年科技骨干培育計(jì)劃項(xiàng)目(2016xz018)
【分類號】:TD235
【正文快照】: 臺(tái)階爆破多通過在現(xiàn)場采用不同爆破參數(shù),對比其爆破塊度的分布、保留巖體爆破地震動(dòng)力效應(yīng)強(qiáng)度、爆破成本等指標(biāo),進(jìn)而優(yōu)化爆破控制參數(shù)。自20世紀(jì)80年代開始,高速攝影技術(shù)被逐漸引入到巖體爆破測試研究中[1-7]。巖體爆破的相似模型試驗(yàn)研究被越來越多的爆破科研及從業(yè)人員重視,

本文編號:1488954

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