孔底惰性介质间隔装药爆破实验
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摘要
为减少岩石大块率和粉碎率,增强爆破效果,采用LS-DYNA数值模拟的方法对连云港核电扩建山体爆破工程爆破碎石的力学过程和能量利用率进行了理论分析,并通过对各模型进入岩石总能量峰值的对比,分析了孔底惰性介质间隔装药对能量利用率的影响趋势,然后依托工程开展全尺寸实验。实验结果表明:孔底适量惰性介质间隔装药可以改善应力波的传播条件,使爆炸能量更均匀、充分地传入岩石中,使岩块的破碎效果得到有效改善;实验工况下,孔底间隔80、100cm空气柱,炸药单耗分别下降11.5%、13.5%;孔底间隔80、100cm水柱,炸药单耗分别下降17.3%、19.2%。
In order to reduce the rock bulk rate and crushing rate and enhance the blasting effect,the mechanical process and energy utilization rate of blasting crushing were analyzed by LS-DYNA numerical simulation method based on Lianyungang nuclear power mountain expansion blasting project.The total energy peaks of each model were compared and the influence of the bottom inert medium in deck charging on the energy utilization rate was analyzed.The full-scale experiment relying on the engineering showed that,moderate amount of inert medium interval charge could improve the propagation of stress wave conditions,which made the explosive energy more uniform and fully into the rock,that the effect of rock fragments of the rock mass was improved effectively.In the conditions like the engineering,the explosive unit consumption decreased by 11.5% and13.5% respectively for 80 cm and 100 cm deck air column in bottom of the blasthole,and the explosive unit consumption decreased by 17.3% and 19.2% respectively for 80 cm and 100 cm deck water column in bottom.
In order to reduce the rock bulk rate and crushing rate and enhance the blasting effect,the mechanical process and energy utilization rate of blasting crushing were analyzed by LS-DYNA numerical simulation method based on Lianyungang nuclear power mountain expansion blasting project.The total energy peaks of each model were compared and the influence of the bottom inert medium in deck charging on the energy utilization rate was analyzed.The full-scale experiment relying on the engineering showed that,moderate amount of inert medium interval charge could improve the propagation of stress wave conditions,which made the explosive energy more uniform and fully into the rock,that the effect of rock fragments of the rock mass was improved effectively.In the conditions like the engineering,the explosive unit consumption decreased by 11.5% and13.5% respectively for 80 cm and 100 cm deck air column in bottom of the blasthole,and the explosive unit consumption decreased by 17.3% and 19.2% respectively for 80 cm and 100 cm deck water column in bottom.
引文
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[2]张松涛,李祥龙,黄永辉.逐孔起爆和间隔装药技术在某矿山的应用[J].中国锰业,2016(1):49-51.ZHANG S T,LI X L,HUANG Y H.An application of hole-by-hole blasting and interval charging technique in a mine[J].China's Manganese Industry,2016(1):49-51.
[3]杜俊林,罗云滚.水不耦合炮孔装药爆破冲击波的形成和传播[J].岩土力学,2003,24(S2):616-618.DU J L,LUO Y G.Study of formation and propagation of shockwave with water-uncouple charge blasting in hole[J].Rock and Soil Mechanics,2003,24(S2):616-618.
[4]魏兴.空气间隔装药在中深孔台阶爆破中的应用[J].采矿技术,2013(2):81-83.WEI X.Air interval charge in hole bench blasting application[J].Mining Technique,2013(2):81-83.
[5]孙效先.深孔水间隔装药爆破在掘沟中的应用[J].金属矿山,1997(8):40-41.SUN X X.Applying of deep water interval charge blasting in trench digging[J].Metal Mine,1997(8):40-41.
[6]郭德禧.深孔水压爆破技术在含水岩体中的应用[J].铁道建筑技术,2001(5):50-52.GUO D X.The technique of deep hole blasting under water pressure applied in water-bearing rock[J].Railway Construction Technology,2001(5):50-52.
[7]王振雄,顾文彬,秦入平,等.水下深孔爆破间隔装药起爆时差影响的数值模拟[J].爆破器材,2012,41(3):8-11.WANG Z X,GU W B,QIN R P,et al.Numerical simulation of the effect of initiation time difference on underwater deep-hole compartment blasting[J].Explosive Materials,2012,41(3):8-11.
[8]NABI N,MOHSEN J,HOMAN N,et al.Numerical modeling of explosive loading on strong rock mass with discontinuity system in depth 25m[J].Open Journal of Geology,2016,6(3):117-130.
[9]张宝平,张庆明,黄风雷.爆轰物理学[M].北京:兵器工业出版社,2006.ZHANG B P,ZHANG Q M,HUANG F L.Detonation physics[M].Beijing:Weapon Industry Press,2006.
[10]朱红兵,卢文波,吴亮.空气间隔装药爆破机理研究[J].岩土力学,2007,28(5):986-990.ZHU H B,LU W B,WU L.Research on mechanism of air-decking technique in bench blasting[J].Rock and Soil Mechanics,2007,28(5):986-990.
[11]张迎吉,周建敏,徐文文,等.不同位置空气间隔装药爆破减振和破碎效果实验[J].工程爆破,2015,21(1):15-19.ZHANG Y J,ZHOU J M,XU W W,et al.Experiment on effect of vibration reduction and rock fragmentation for different positions air-decking charge blasting[J].Engineering Blasting,2015,21(1):15-19.