动力扰动下深部采空区围岩力学响应及充填作用效果
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摘要
针对深部采空区承受高静载同时受到周边采场爆破地震波扰动的具体情况,为研究采场围岩的稳定性,应用应力波方法分析了采空区围岩受到侧崩时的动力响应及充填的支护效果,采用有限差分软件FLAC3D模拟了安徽省铜陵的冬瓜山铜矿典型采场受到周边开采爆破侧崩时的动力特征及全尾胶充填的支护效果。分析结果表明:爆炸地震波传播过程中,围岩应力场受到扰动,采空区自由面振动速度幅值约为围岩内部的2倍,围岩产生新的塑性变形,质点位移增加;对采场进行充填能够降低接触面振动速度,减少围岩塑性变形及质点位移,从而保护了采场间柱,提高采场围岩稳定性。
The deep stoped-out areas in a mine are subjected to high pressure and the blasting vibration around stopes will disturb it.In order to analyze the stability of the stoped-out areas,the stress wave method is used to analyze the dynamic response of the stoped-out areas under lateral impact and the filling support effect and the finite difference program FLAC3D is used to simulate the dynamic characteristics under mining and blasting and the filling support effect of a typical stope of the Dongguashan copper mine in Tongling of Anhui Province.The results show that the rock stress field is disturbed through the spreading of the blasting seismic wave,the free surface's vibration velocity is about twice that of the wall rock,the new plastic deformation appears and the particle displacement of the free surface increases.The application of fillings will inhibit these phenomena,besides,the insulating pillars are protected and the stability of stopes is improved.
The deep stoped-out areas in a mine are subjected to high pressure and the blasting vibration around stopes will disturb it.In order to analyze the stability of the stoped-out areas,the stress wave method is used to analyze the dynamic response of the stoped-out areas under lateral impact and the filling support effect and the finite difference program FLAC3D is used to simulate the dynamic characteristics under mining and blasting and the filling support effect of a typical stope of the Dongguashan copper mine in Tongling of Anhui Province.The results show that the rock stress field is disturbed through the spreading of the blasting seismic wave,the free surface's vibration velocity is about twice that of the wall rock,the new plastic deformation appears and the particle displacement of the free surface increases.The application of fillings will inhibit these phenomena,besides,the insulating pillars are protected and the stability of stopes is improved.
引文
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[3]Diering D H.Mining at ultra depths in the 21st cen-tury[J].CIM Bulletin,2000,93(1036):141-145.
[4]Richardson E,Jordan T H.Seismicity in deep goldmines of South Africa:Implications for tectonicearthquakes[J].Bulletin of the Seismological Societyof America,2002,92(5):1766-1782.
[5]何满潮,钱七虎.深部岩体力学研究进展[C]//第九届全国岩石力学与工程学术大会论文集.北京:科学出版社,2006:49-62.
[6]王新民,肖卫国,张钦礼.深井矿山充填理论与技术[M].长沙:中南大学出版社,2005.
[7]唐礼忠,潘长良,杨承祥,等.冬瓜山铜矿微震监测系统及其应用研究[J].金属矿石,2006,10:41-45.
[8]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.
[9]朱万成,左宇军,尚世明,等.动态扰动触发深部巷道发生失稳破坏的数值模拟[J].岩石力学与工程学报,2007,26(5):915-921.
[10]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.
[11]于学馥,郑颖人,刘怀恒,等.地下工程围岩稳定分析[M].北京:煤炭工业出版社,1983.
[12]赵凯,刘长武,张国良.用弹性力学的复变函数法求解矩形硐室周边应力[J].采矿与安全工程学报,2007,24(3):361-365.
[13]杨佳通.弹塑性动力学基础[M].北京:科学出版社,2008.
[14]蔡嗣经.矿山充填力学基础[M].北京:冶金工业出版社,2009.
[15]Blight G E,Clarke I E.Design and properties ofstiff fill for lateral support of pillars[J].Internation-al Journal of Rock Mechanics and Mining Sciences&Geomechanics Abstracts,1983,22(3):A91.
[16]王文哲,杨小聪,郭利杰.FLAC3D用于充填模拟分界面力学特性研究[J].矿冶,2010,19(2):1-4.
[17]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.
[18]龙源,冯长根,徐全军,等.爆破地震波在岩石介质中传播特性与数值计算研究[J].工程爆破,2000,6(3):1-7.
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