地震波对条带开采煤柱动态稳定性影响研究
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摘要
由于地震波、爆破震动等动态应力作用下,采空区的响应对煤矿安全开采、地表沉陷控制等具有重要影响,基于弹性力学平面波理论,讨论了地震波诱发煤柱失稳的机理;利用有限差分方法对某条带开采采空区进行静力计算,在此基础上进一步分析了在地震波作用下采空区煤柱的动力响应。研究表明:在静力条件下,采空区煤柱处于稳定状态,能有效地支撑上部岩体;在地震波作用下,煤柱两侧屈服程度增加,应力减小,煤柱的应力向中部转移;塑性区向煤柱内部及顶底板扩展,煤柱稳定性降低。因此在开采设计时,应考虑地震等动载荷对采空区稳定性的影响。
Under the seismic waves,blasting seismic and other dynamics stress effects,the responses of the goaf would have the influences to the mine safety mining,the surface ground subsidence control and others.Based on the elastic mechanics plane wave theory,the paper had a discussion on the mechanism of coal pillar stability lost caused by the seismic waves.The finite difference method was applied to the static calculation of the goaf in a strip mining.Based on the circumstance,a further analysis was conducted on the dynamics responses of the coal pillars in the goaf under the seismic wave effect.The study showed that under the static condition,the coal pillars in the goaf would be in stable status and could effectively support the rocks above.Under the seismic wave effect,the yield degree of the two sides along the coal pillar would be increased,the stress would be reduced and the stress of the coal pillar would be transferred to the middle part of the coal pillar.The plastic zone would be expanded to the middle part and to the roof and floor and the stability of the coal pillar would be reduced.Therefore,the seismic and dynamic load affected to the stability of the goaf should be considered in the mining design.
Under the seismic waves,blasting seismic and other dynamics stress effects,the responses of the goaf would have the influences to the mine safety mining,the surface ground subsidence control and others.Based on the elastic mechanics plane wave theory,the paper had a discussion on the mechanism of coal pillar stability lost caused by the seismic waves.The finite difference method was applied to the static calculation of the goaf in a strip mining.Based on the circumstance,a further analysis was conducted on the dynamics responses of the coal pillars in the goaf under the seismic wave effect.The study showed that under the static condition,the coal pillars in the goaf would be in stable status and could effectively support the rocks above.Under the seismic wave effect,the yield degree of the two sides along the coal pillar would be increased,the stress would be reduced and the stress of the coal pillar would be transferred to the middle part of the coal pillar.The plastic zone would be expanded to the middle part and to the roof and floor and the stability of the coal pillar would be reduced.Therefore,the seismic and dynamic load affected to the stability of the goaf should be considered in the mining design.
引文
[1]柴华彬,邹友峰,郭文兵.村庄下倾斜煤层条带开采方法研究[J].中国安全科学学报,2008,18(10):172-176.
[2]高富强,高新峰,康红普.动力扰动下深部巷道围岩力学响应FLAC分析[J].地下空间与工程学报,2009,5(4):682-685.
[3]李夕兵,李地元,郭雷,等.动力扰动下深部高应力矿柱力学响应研究[J].岩石力学与工程学报,2007,26(5):922-928.
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[5]陈继锋.甘肃华亭地区矿震记录特征分析[J].西北地震学报,2010,32(1):92-94.
[6]邹友峰,柴华彬.我国条带煤柱稳定性研究现状及存在问题[J].采矿与安全工程学报,2006,23(2):141-145.
[7]徐芝纶.弹性力学[M].北京:高等教育出版社,2006.
[8]陈育民,徐鼎平.FLAC/FLAC3D基础与工程实例[M].北京:中国水利水电出版社,2008.
[9]蒋溥,戴丽思.工程地震学概论[M].北京:地震出版社,1993:201-202.
[10]Itasca Consulting Group Inc.FLAC3D(Fast Lagrangian Analy-sis of Continua in 3 Dimensions)Users Manual(Version 3.00)[K].USA:Itasca Consulting Group Inc,2002.
[2]高富强,高新峰,康红普.动力扰动下深部巷道围岩力学响应FLAC分析[J].地下空间与工程学报,2009,5(4):682-685.
[3]李夕兵,李地元,郭雷,等.动力扰动下深部高应力矿柱力学响应研究[J].岩石力学与工程学报,2007,26(5):922-928.
[4]Lee C F.Performance of Underground Coal Mines During the1976 Tangshan Earthquake[J].Tunneling and UndergroundSpace Technology,1987(2):199-202.
[5]陈继锋.甘肃华亭地区矿震记录特征分析[J].西北地震学报,2010,32(1):92-94.
[6]邹友峰,柴华彬.我国条带煤柱稳定性研究现状及存在问题[J].采矿与安全工程学报,2006,23(2):141-145.
[7]徐芝纶.弹性力学[M].北京:高等教育出版社,2006.
[8]陈育民,徐鼎平.FLAC/FLAC3D基础与工程实例[M].北京:中国水利水电出版社,2008.
[9]蒋溥,戴丽思.工程地震学概论[M].北京:地震出版社,1993:201-202.
[10]Itasca Consulting Group Inc.FLAC3D(Fast Lagrangian Analy-sis of Continua in 3 Dimensions)Users Manual(Version 3.00)[K].USA:Itasca Consulting Group Inc,2002.
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