高心墙堆石坝极限抗震能力初探
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摘要
高土石坝需要进行极限抗震能力和地震破坏模式分析。通过坝体动力反应分析、动强度验算以及地震变形分析,综合研究了高心墙土石坝的破坏过程。认为处于抗震极限状态的大坝防渗体及上游反滤料的顶部存在动强度不足问题,进而引起坝顶地震裂缝及上游反滤料顶部液化,最终导致坝体上、下游坝坡的失稳破坏。
It is crucial to analyze the limit aseismic capacity and the failure mode for high core rockfill dam.The process of failure for high core rockfill dam is comprehensively studied on the basis of analyzing dynamic response,dynamic strength and seismic permanent deformation.The dynamic strength appears to be severely deficient in the impervious body and the upstream filter layer as the dam falls into the limit state.It is considered that the deficiency of dynamic strength will induce seismic fracture and liquefaction in the upstream filter layer,which finally will lead to failure of upstream and downstream slopes.
It is crucial to analyze the limit aseismic capacity and the failure mode for high core rockfill dam.The process of failure for high core rockfill dam is comprehensively studied on the basis of analyzing dynamic response,dynamic strength and seismic permanent deformation.The dynamic strength appears to be severely deficient in the impervious body and the upstream filter layer as the dam falls into the limit state.It is considered that the deficiency of dynamic strength will induce seismic fracture and liquefaction in the upstream filter layer,which finally will lead to failure of upstream and downstream slopes.
引文
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[2]SEED H B.Soil liquefaction and cyclic mobility evaluation for level ground during earthquakes[J].Journal of the Geotechnical Engineering Division,ASCE,1979,105(2):201-255.
[3]SEED H B,IDRISS I M.Ground motions and soil liquefaction during earthquake[M].Berkeley:Earthquake Engineering Research Institue,1982.
[4]常亚屏.高土石坝抗震关键技术研究[J].水力发电,1998,(3):36-40.
[5]陈生水,郦能惠.瀑布沟心墙堆石坝地震裂缝分析[J].水利水运科学研究,1995,12(4):384-393.CHEN Sheng-shui,LI Neng-hui.Anslysis of crack induced by earthquake for Pubugou core rockfill dam[J].Journal of Reserch on Water Conservancy and Communications,1995,12(4):384-393.
[6]顾淦臣.土石坝的裂缝和压实质量[J].岩土工程学报,1982,4(4):56-67.GU Gan-chen.The cracks of earth-rock dams and density of compacted dam zone[J].Chinese Journal of Geotechnical Engineering,1982,4(4):56-67.
[7]李君纯.土坝裂缝的简捷估算方法[J].水利水运科学研究,1983,(3):1-11.LI Jun-chun.Simplified methods for evaluating cracks in earh dam[J].Journal of Reserch on Water Conservancy and Communications,1983,4(3):1-11.
[8]黄河水利委员会勘测规划设计研究院.SL274-2001碾压式土石坝设计规范[S].北京:中国水利水电出版社,2002.
[9]中国水利水电科学研究院.SL203-97水工建筑物抗震设计规范[S].北京:中国水利水电出版社,1997.
[10]NEWMARK N M.Effects of earthquakes on dams and embankments[J].Geotechnique,1965,15(2):139-160.
[11]李亮,迟世春,林皋.基于蚁群算法的复合形法及其在边坡稳定分析中的应用[J].岩土工程学报,2004,26(5):691-696.LI Liang,CHI Shi-chun,LIN Gao.The complex method based on ant colony algorithm and its application to the slope stability analysis[J].Chinese Journal of Geo-technical Engineering,2004,26(5):691-696.
[12]OZKAN M Y.A review of considerations on seismic safety of embankments and earth and rock-fill dams[J].Soil Dynamics and Earthquake Engineering,1998,17:439-458
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