四川会东老虎岩尾矿坝地震反应分析
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摘要
应用有效应力有限元法研究了老虎岩尾矿坝在不同坝高时的应力水平、变形和孔隙水压力分布,以及遭到Ⅶ度地震作用时的反应。分析结果表明:在当前坝高情况下,无地震作用时尾矿坝处于稳定状态。在受烈度为Ⅶ度的地震作用下,尾矿堆积坝坝外坡和沉积滩面的堆积尾矿砂土在局部已经发生液化破坏;在封库坝高情况下,无地震作用时尾矿坝处于极限状态。在受烈度为Ⅶ度的地震作用下,尾矿坝坝外坡和沉积滩面的堆积尾矿砂土已发生大面积液化破坏。在地震作用下,老虎岩尾矿坝堆积尾矿产生液化破坏的主要原因是堆积坝体内浸润线的埋深较浅。对老虎岩尾矿坝必须加强排渗措施,使坝体内浸润线下移。
Application of effective stress finite element method to the study of stress levels,deformation and pore water pressure distribution of the Tiger rock tailings dam when the dam is in different heights,and to the response of the dam at earthquake of Ⅶ degree.The results show that in the case of the current dam height,the tailings dam is stable when no earthquake occurs.When the intensity of the earthquake is Ⅶ degrees,the tailings dam stacks outside the beach slope and liquefaction damage in the local sand tailings has occurred.In the case of the final dam height,when no earthquake occurs,the tailings dam is in a limit state.When the intensity of the earthquake is Ⅶ degrees,the major area of tailings dam outside the beach slope and sediment accumulation of tailings sand has occurred with liquefaction damage.In the earthquake,the main reason for accumulation of tailings to producing the liquefied damage of the Tiger rock tailings dam is that the infiltration line depth of the accumulation dam is shallow.The measurements for seepage drainage of the Tigers rock tailings dam must be strengthened,making the infiltration line of dam go down.
Application of effective stress finite element method to the study of stress levels,deformation and pore water pressure distribution of the Tiger rock tailings dam when the dam is in different heights,and to the response of the dam at earthquake of Ⅶ degree.The results show that in the case of the current dam height,the tailings dam is stable when no earthquake occurs.When the intensity of the earthquake is Ⅶ degrees,the tailings dam stacks outside the beach slope and liquefaction damage in the local sand tailings has occurred.In the case of the final dam height,when no earthquake occurs,the tailings dam is in a limit state.When the intensity of the earthquake is Ⅶ degrees,the major area of tailings dam outside the beach slope and sediment accumulation of tailings sand has occurred with liquefaction damage.In the earthquake,the main reason for accumulation of tailings to producing the liquefied damage of the Tiger rock tailings dam is that the infiltration line depth of the accumulation dam is shallow.The measurements for seepage drainage of the Tigers rock tailings dam must be strengthened,making the infiltration line of dam go down.
引文
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[3]潘建平,孔宪京,邹德高.尾矿坝地震液化稳定的简化分析[J].水利学报,2006,33(10):1224-1229.[PAN J P,KONG X J,ZOU D G.Simplified analysisof liquefaction and stability of tailing dam duringearthquake[J].Journal of Hydraulic Engineering,2006,33(10):1224-1229.(in Chinese)]
[4]刘汉龙,费康,高玉峰.边坡地震稳定性时程分析方法[J].岩土力学,2003,24(4):553-556.[LIU H L,FEI K,GAO Y F.Time history analysismethod of slope seismic stability[J].Rock and soilmechanics,2003,24(4):553-556.(in Chinese)]
[5]潘建平.地震作用下尾矿坝稳定及加筋效果分析[J].金属矿山,2009(3):19-23.[PAN J P.Analysis of the Seismic Stability and GeotextileReinforcement Effect of Tailing Dam[J].Metal Mine,2009(3):19-23.(in Chinese)]
[6]柳厚祥,廖雪,李宁.高尾矿坝的有效应力地震反应分析[J].振动与冲击,2008,27(1):65-70.[LIU H X,LIAO X,LI N.Seismic response analysisof high tailing dams using effective stress finite elementmethod[J].Journal of Vibration and Shock,2008,27(1):65-70.(in Chinese)]
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