下伏采空区的煤矿地表地震动力响应模拟
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摘要
针对中国煤矿多分布于7度及7度以上的地震烈度区,煤矿大规模开采,在矿区地层中留下了大面积、立体分布的空间,一些开采位于工业区或居住区的下部等问题,采用FLAC3D软件,建立了不同条件下的数值模型,对下伏采空区的煤矿地表地震响应进行分析.模拟结果显示:在剪切地震波的作用下,下伏采空区煤矿地表的最大水平加速度受到地下采空区的影响.讨论了在采深及采空区填充参数不同的情况下,地表监测位置的响应值变化.
Chinese coal mines are mostly located in the region with seismic intensity of 7 or higher.The vast tridimensional mined-out spaces formed in the strata of mine goaf have been increasing due to large-scale coal mining exploitation.Especially some underground mines are located in the industrial and residential areas.The study analyzed the seismic response at the ground surface transferred from the mine goaf by using FLAC3D numerical models for various conditions.The results show that the peak values of the ground surface wave(PGA) for an earthquake SH wave are affected by existing underground spaces of the goaf.These effects have been analyzed and evaluated at monitoring positions on the ground surface with different depth and filling conditions of the goaf.
Chinese coal mines are mostly located in the region with seismic intensity of 7 or higher.The vast tridimensional mined-out spaces formed in the strata of mine goaf have been increasing due to large-scale coal mining exploitation.Especially some underground mines are located in the industrial and residential areas.The study analyzed the seismic response at the ground surface transferred from the mine goaf by using FLAC3D numerical models for various conditions.The results show that the peak values of the ground surface wave(PGA) for an earthquake SH wave are affected by existing underground spaces of the goaf.These effects have been analyzed and evaluated at monitoring positions on the ground surface with different depth and filling conditions of the goaf.
引文
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[3]李海波,马行东,李俊如.地震荷载作用下地下岩体洞室位移特征的影响因素分析[J].岩土工程学报,2006,28(3):358-362.Li Haibo,Ma Xingdong,LI Junru.Study on influence factors of rock caverndisplacement under earthquake[J].Chinese Journal of GeotechnicalEngineering,2006,28(3):358-362.
[4]中国地震局工程力学研究所.唐山地震震害调查初步总结[M].北京:地震出版社,1978.Institute of Engineering Mechanics.China Earthquake Administration,Summary of damage in Tangshan earthquake[M].Earthquake Press,1978.
[5]闫长斌,徐国元,李夕兵.爆破震动对采空区稳定性影响的FLAC3D分析[J].岩石力学与工程学报,2005,24(16):2894-2899.Yan Changbin,Xu Guoyuan,Li Xibing.Stability analysis of mined-outAreas influenced by blasting vibration with FLAC3D[J].Chinese Journal ofRock Mechanics and Engineering,2005,24(16):2 894-2 899.
[6]张丽华,陶连金.节理岩体地下洞室群的地震动力响应分析[J].世界地震工程,2002,18(2):158-162.Zhang Lihua,Tao Lianjin.Dynamic response analysis of large undergroundexcavations in jointed rock[J].World Earthquake Engineering,2002,18(2):158-162.
[7]FLAC(Fast Lagrangian Analysis of Continua in 3Dimention),Version3.0,User’s Manual[S].USA:Itasca Consulting Group Inc,2006.
[8]谢和平,分形—岩石力学导论[M].北京:科学出版社,1996.Xie Heping,Introduction to fractal rock mechanics[M].Beijing:Science Press,1996.
[9]Kulemeyer R L,Lysmer J.Finite element method accuracy for wave propagationproblems[J].Journal of Soil Mechanics and Foundations,1973,99(SM4):421-427.
[10]谢和平,周宏伟,王金安,等.FLAC在煤矿开采沉陷预测中的应用及对比分析[J].岩石力学与工程学报,1999,18(4):397-401.Xie Heping,Zhou Hongwei,Wang Jinan,et al.Application of FLACto prediction of ground surface displacements due to coal extractionand its comparative analysis[J].Chinese J of Rock Mech.&Eng,1999,18(4):397-401.
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