普庆铁矿矿震发生机理研究
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摘要
以湖北省大冶市灵乡普庆铁矿矿震灾害为例,通过三维有限元数值分析和RMR岩体分类评分以及采场爆破诱发应变能释放成因分析,研究了矿震发生的机理,并利用RMR-σθ/cσ岩体破坏类型分类方法分析了矿震发生所具备的必要条件。这种综合分析方法为矿山和岩土工程设计提供了一种新的途径来预测工程岩体可能发生的变形和包括矿震在内的地质灾害。分析结果表明,普庆铁矿-393 m水平具备发生矿震的地质条件和力学因素,由于采矿爆破作业对采场整体刚度系数的弱化影响,诱发应变能的突然释放,最后导致"4.6"矿震,这与现场实际数据吻合。
The mechanism of minig tremor in Puqing Iron Mine of Daye is investigated by means of 3D FEM numerical analysis,RMR rock classification,and examination of sudden strain energy release caused by mining explosion operations.Rock failure classification with RMR-σθ/σc is used to analyze the prerequisites for mining tremor.A comprehensive analysis method proposed may provide a means to predict rock deformation and geo-disasters including mining tremors in geo-mechanical engineering.Analysis in the paper indicates that-393m level in Puqing Iron Mine is prone geo-structurally and mechanically to mining tremor.Mining explosion may weaken the whole mining system rigidness and consequently induce the sudden strain energy release for the '4·6' mining tremor.This analysis agrees well with the actual data.
The mechanism of minig tremor in Puqing Iron Mine of Daye is investigated by means of 3D FEM numerical analysis,RMR rock classification,and examination of sudden strain energy release caused by mining explosion operations.Rock failure classification with RMR-σθ/σc is used to analyze the prerequisites for mining tremor.A comprehensive analysis method proposed may provide a means to predict rock deformation and geo-disasters including mining tremors in geo-mechanical engineering.Analysis in the paper indicates that-393m level in Puqing Iron Mine is prone geo-structurally and mechanically to mining tremor.Mining explosion may weaken the whole mining system rigidness and consequently induce the sudden strain energy release for the '4·6' mining tremor.This analysis agrees well with the actual data.
引文
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[2]郑怀昌,张晓君.冒落型矿震能量确定探讨[J].金属矿山,2006(7):24-26.
[3]孙文福,周元夫,焦明若,等.关于抚顺矿震活动趋势分析[J].高原地震,2002,14(2):45-50.
[4]欧阳治华,李强,许梦国.正兴铁矿后期回采围岩破坏规律的数值模拟[J].武汉科技大学学报:自然科学版,2007,30(2):1-4.
[5]Barton N R,Lien R,Lunde J.Engineering classifi-cation of rock masses for the design of tunnel sup-port[J].Rock Mechanics,1974,6(4):189-239.
[6]Bieniawski Z T.Engineering rock mass classifica-tions[M].New York:Wiley,1989.
[7]陆锋,曹阳,颜荣贵.高峰型矿震地压灾害研究策略与技术对策[J].湖南有色金属,2003,19(6):5-8.
[8]李永靖,张向东,兰常玉,等.矿山地下岩层移动变形用于预测矿震的研究[J].中国矿业,2005,14(10):66-68.
[9]Coates D F.岩石力学原理[M].雷化南,译.北京:冶金工业出版社,1978.
[10]Vladimir Sedlak.Energy evaluation of destress blas-ting[J].Acta Montanistica Slovaca Rocnik,1997(2):11-15.
[11]G Russoe,P Grasso.On the classification of rockmass excavation behaviour in tunneling[C]//11thCongress of International Society of Rock Mechan-ics.Lisbon:Portuguese Geotechnical Society,2007:9-13.
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