露天爆破振动作用下地下多层采空区稳定性数值模拟分析
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摘要
针对露天采场下方的多层地下空区在爆破振动影响下的稳定性进行了分析,根据露天采场小规模的爆破振动测试采集到的爆破地震波数据,得到了PPV预测公式和PF预测公式;进而建立ANASYS数值模型进行分析,确定了实验爆破振动情况下现有空区的稳定性,得到了适用于龙潭村铁矿采空区的PPV衰减规律,并计算得到了不同最大段装药量下露天采场爆区到采空区的安全距离。
The stability of multi-layer underground goafs under the influence of blasting vibration was analyzed,and the PPV prediction formula and PF prediction formula were obtained according to the blasting seismic wave data collected from smallscale blasting vibration test of open stope.Then the ANASYS numerical model was established to determine the existing goafs under the condition of experimental blasting vibration,to obtain the PPV attenuation law applicable to the goafs in Longtan iron mine,as well as to calculate the safe distance from the blasting area to the goafs in the open stope with different maximum charges.
The stability of multi-layer underground goafs under the influence of blasting vibration was analyzed,and the PPV prediction formula and PF prediction formula were obtained according to the blasting seismic wave data collected from smallscale blasting vibration test of open stope.Then the ANASYS numerical model was established to determine the existing goafs under the condition of experimental blasting vibration,to obtain the PPV attenuation law applicable to the goafs in Longtan iron mine,as well as to calculate the safe distance from the blasting area to the goafs in the open stope with different maximum charges.
引文
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[2]韩万东,李秋实,苏彦斌.露天矿岩质边坡爆破振动响应特征研究[J].矿业研究与开发,2015,35(10):55-58.
[3]郑颖人,王永甫,王成,等.节理岩体隧道的稳定分析与破坏规律探讨-隧道稳定性分析讲座之一[J].地下空间与工程学报,2011,7(4):649-656.
[4]操永胜.露天转地下开采境界矿柱动力响应分析[J].矿业研究与开发,2014,34(1):22-25.
[5]Kewei Liu,Hong Hao,Xibing Li.Numerical analysis of the stability of abandoned cavities in bench blasting[J].J Rock Mech Min Sci,2017(92):30-39.
[6]Liu L,Katsabanis P D.Development of a continuum damage model for blasting analysis[J].J Rock Mech Min Sci,1997,34(2):217-231.
[7]Persson P A.The relationship between strain energy,rock damage,fragmentation,and throw in rock blasting[J].JBlast Fragm,1997(1):99-110.
[8]Qian Q H,Zhou X P.Quantitative analysis of rockburst for surrounding rocks and zonal disintegration mechanism in deep tunnels[J].J Rock Mech Geotech Eng,2011,3(1):1-9.
[9]Ma G W,Hao H,Wang F.Simulations of explosioninduced damage to underground rock chambers[J].J Rock Mech Geotech Eng,2011,3(1):19-29.
[10]Tunstall A M.Damage to underground excavations from open-pit blasting[J].Trans Inst Min Met(Sect A:Min Ind),1997(106):A19-A24.
[11]Taylor L M,Chen E P,Kuszmaul J S.Micro-crack induced damage accumulation in brittle rock under dynamic loading[J].Comp Meth Appl Mech Eng,1986(55):301-320.
[12]Sakurai S,Kitamura Y.Vibration of tunnel due to adjacent blasting operation[J].International Symposium on Field Measurement in Rock Mechanics.Switzerland:Zurich,1977:61-77.