發(fā)布時間：2018-02-04 01:46

  本文關(guān)鍵詞： 毫秒延時爆破 臺階爆破 裂紋擴展 應(yīng)力場 超動態(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爆破破巖過程特征物理量分布演化機制,進一步優(yōu)選爆破參數(shù)、完善毫秒延時破巖機理,進行了室內(nèi)毫秒延時臺階爆破相似模型實驗。應(yīng)用高速攝影機和超動態(tài)應(yīng)變儀建立綜合實驗研究系統(tǒng),對毫秒延時爆破進行動態(tài)實時監(jiān)測,得到臺階自由面處裂紋擴展規(guī)律和延時時間對邊坡表面應(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已形成新自由面的最小臨界延時為9 ms;設(shè)計延時為15 ms或25 ms時,可降低對邊坡表面應(yīng)變峰值影響程度;為促進相鄰炮孔爆炸應(yīng)力波充分疊加、增強巖體破碎效果,孔間延時最大臨界值為15 ms。綜合考慮坡體應(yīng)力狀態(tài)及臺階爆破效果雙重因素,實驗條件下最優(yōu)孔間延時為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)研究項目(Q20161101) 武漢科技大學(xué)青年科技骨干培育計劃項目(2016xz018)
【分類號】：TD235
【正文快照】： 臺階爆破多通過在現(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力效應(yīng)強度、爆破成本等指標(biāo),進而優(yōu)化爆破控制參數(shù)。自20世紀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