岩体爆破综合实验研究系统及其应用

发布时间：2018-02-04 01:46

  本文关键词： 毫秒延时爆破 台阶爆破 裂纹扩展 应力场 超动态应变仪 高速摄影　出处：《矿冶工程》2017年02期 　论文类型：期刊论文

【摘要】：为定量分析研究毫秒延时爆破破岩过程特征物理量分布演化机制,进一步优选爆破参数、完善毫秒延时破岩机理,进行了室内毫秒延时台阶爆破相似模型实验。应用高速摄影机和超动态应变仪建立综合实验研究系统,对毫秒延时爆破进行动态实时监测,得到台阶自由面处裂纹扩展规律和延时时间对边坡表面应力峰值及内部应力场叠加的影响程度。结果表明,确保后序药包起爆时已形成新自由面的最小临界延时为9 ms;设计延时为15 ms或25 ms时,可降低对边坡表面应变峰值影响程度;为促进相邻炮孔爆炸应力波充分叠加、增强岩体破碎效果,孔间延时最大临界值为15 ms。综合考虑坡体应力状态及台阶爆破效果双重因素,实验条件下最优孔间延时为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.
【作者单位】： 武汉科技大学理学院;中铁港航-武科大爆破技术研究中心;武汉爆破有限公司;
【基金】：国家自然科学基金(51574184) 湖北省教育厅科学技术研究项目(Q20161101) 武汉科技大学青年科技骨干培育计划项目(2016xz018)
【分类号】：TD235
【正文快照】： 台阶爆破多通过在现场采用不同爆破参数,对比其爆破块度的分布、保留岩体爆破地震动力效应强度、爆破成本等指标,进而优化爆破控制参数。自20世纪80年代开始,高速摄影技术被逐渐引入到岩体爆破测试研究中[1-7]。岩体爆破的相似模型试验研究被越来越多的爆破科研及从业人员重视，

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