基于LS-DYNA的临近采空区多段爆破微差时间优化研究
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摘要
临近采空区多段毫秒微差爆破的微差时间选取直接关乎采空区顶板的稳定性。为了探究临近采空区毫秒延时爆破最优微差间隔时间,在分析总结国内外实际生产中选取的微差间隔时间的基础上,将某地下矿山实际开采情况简化为花岗岩介质中采空区附近2个柱形耦合装药炮孔研究模型,并从计算机模拟的角度,运用ANSYS/LS-DYNA有限元动力分析程序对微差间隔时间分别为0 ms/m、3 ms/m、5 ms/m、7 ms/m、8 ms/m的毫秒微差爆炸过程分别进行数值计算,得到了爆炸过程中采空区顶板观测点的振动速度-时间曲线及振速峰值。分析结果表明:微差间隔时间为28 ms,即7 ms/m时干涉减振效果最优。
The blasting delay time directly affects the stability about the roof underground. In order to study the optimized interval time of blasting near underground goaf,a mathematical model of millisecond delay time blast in granite with 2 blast holes was established based on the analysis of practice production interval time at home and abroad. Using the computer simulation,the process of the blast delay time with 3 ms / m、5 ms / m、7 ms / m、8 ms / m were simulated based on ANSYS / LS-DYNA,by which the curve of time-velocity was obtained. The results show that the delay interval time with 28 ms was optimum.
The blasting delay time directly affects the stability about the roof underground. In order to study the optimized interval time of blasting near underground goaf,a mathematical model of millisecond delay time blast in granite with 2 blast holes was established based on the analysis of practice production interval time at home and abroad. Using the computer simulation,the process of the blast delay time with 3 ms / m、5 ms / m、7 ms / m、8 ms / m were simulated based on ANSYS / LS-DYNA,by which the curve of time-velocity was obtained. The results show that the delay interval time with 28 ms was optimum.
引文
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[2]刘庆,康强,赵明生.孔内微差爆破数值模拟及试验研究[J].矿业研究与开发,2013,33(3):108-111.LIU Qing,KANG Qiang,ZHAO Ming-sheng.Numerical simulation and experiment research of in in-hole microsecond blasting[J].Mining R&D,2013,33(3):108-111.(in Chinese)
[3]崔正荣,张西良.梅山铁矿深孔爆破合理微差时间研究[J].现代矿业,2014(541):9-39.CUI Zheng-rong,ZHANG Xi-liang.Research on the reasonable differential time of deep hole blasting in Meishan Iron Mine[J].Modern Mining,2014(541):9-39.(in Chinese)
[4]张袁娟,黄金香,农冬灵,等.某露天矿生产爆破合理微差时间探讨[J].煤炭技术,2013,32(12):201-203.ZHANG Yuan-juan,HUANG Jin-xiang,NONG Dong-ling,et al.Study on reasonable millisecond delay time in openpit mine[J].Coal Technology,2013,32(12):201-203.(in Chinese)
[5]陈寿如,李雁翎,谢圣权.露天采场台阶干扰降震爆破技术试验研究[J].湖南科技大学学报(自然科学版),2004,19(2):10-13.CHEN Shou-ru,LI Yan-ling,XIE Sheng-quan.Experimental study of blasting vibration reduction by waveform interference in an open stop[J].Journal of Hunan University of Science&Technology(Natural Science Edition),2004,19(2):10-13.(in Chinese)
[6]史秀志,陈寿如.爆破振动信号时频特征的微差时间效应[J].湖南科技大学学报(自然科学版),2008,23(3):10-13.SHI Xiu-zhi,CHEN Shou-ru.Delay time interval effect for the time-frequency characteristic of blast vibration signal[J].Journal of Hunan University of Science&Technology(Natural Science Edition),2008,23(3):10-13.(in Chinese)
[7]舒西刚,刘新荣,姜德义,等.歌乐山石灰石矿爆破地震波的测试与分析[J].地下空间与工程学报,2008,4(3):586-560.SHU Xi-gang,LIU Xin-rong,JIANG De-yi,et al.Test and analysis on blasting seismic wave of Geleshan limestone mine[J].Chinese Journal of Underground Space and Engineering,2008,4(3):586-560.(in Chinese)
[8]叶海旺,石文杰,王二猛,等.金堆城露天矿生产爆破合理微差时间的探讨[J].爆破,2010,27(1):96-98.YE Hai-wang,SHI Wen-jie,WANG Er-meng,et al.Research of reasonable delay intervals in Jinduicheng open-pit mine[J].Blasting,2010,27(1):96-98.(in Chinese)
[9]赵明生,张建华,易长平.基于单段波形叠加的爆破振动信号时频分析[J].煤炭学报,2010,35(8):1279-1282.ZHAO Ming-sheng,ZHANG Jian-hua,YI Chang-ping.Timefrequency analysis based on single-stage addition of waveforms of blasting vibration signals[J].Journal of China Coal Society,2010,35(8):1279-1282.(in Chinese)
[10]宋光明,曾新吾,陈寿如,等.基于波形预测小波包分析模型的降振微差时间选择[J].爆炸与冲击,2003,23(2):163-168.SONG Guang-ming,ZENG Xin-wu,CHENG Shou-ru,et al.The selection of millisecond delay interval of blasting for decreasing ground vibration based on the wavelet packets prediction model of waveforms[J].Explosion and Shock Waves,2003,23(2):163-168.(in Chinese)
[11]凌同华,李夕兵,王桂尧.爆破震动灾害主动控制方法研究[J].岩土力学,2007,28(7):1140-1142.LING Tong-hua,LI Xi-bing,WANG Gui-yao.A study on initiative control of blast vibration damages[J].Rock and Soil Mechanics,2007,28(7):1140-1142.(in Chinese)
[12]赵海鸥.LS-DYNA动力分析指南[M].北京:兵器工业出版社,2003.
[13]白金泽.LS-DYNA3D理论基础与实例分析[M].北京:科学出版社,2005.
[14]石少卿,康建功,江敏,等.LS-DYNA在爆炸与冲击领域内的工程应用[M].北京:中国建筑工业出版社,2011.
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