深厚黄土覆盖层上土石坝地震响应特性分析
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摘要
采用非线性有限单元法和笔者曾提出的动孔压试验曲线法,对某深厚黄土覆盖层上土石坝进行了有效应力法地震响应分析,重点分析大坝的绝对加速度、动位移和动应力等动力响应及动孔隙水压力分布情况。分析结果表明,在现有设计条件下,由于坝基软弱黄土覆盖层较厚,大坝在7度地震作用下地震响应不强烈,但坝基黄土覆盖层会出现液化情况,需采取相应的抗液化工程措施。
The 2D non-linear effective stress FEM and test curve method for calculation of dynamic pore water pressure which was suggested by the second author are applied to analyze the dynamic response of an earth-rockfill dam on thick loess alluvial deposit,with emphasis on the distribution characters of absolute acceleration,dynamic displacement,dynamic stress and dynamic pore water pressure.The calculation results show that the dynamic response of the dam is not strong because of the soft deep loess alluvial deposit,but the loess alluvial deposit will be liquefied under the earthquake with intansity of 7 degree on the present design condition.Therefore,the resistance method of liquefaction should be adopted for the loess foundation.
The 2D non-linear effective stress FEM and test curve method for calculation of dynamic pore water pressure which was suggested by the second author are applied to analyze the dynamic response of an earth-rockfill dam on thick loess alluvial deposit,with emphasis on the distribution characters of absolute acceleration,dynamic displacement,dynamic stress and dynamic pore water pressure.The calculation results show that the dynamic response of the dam is not strong because of the soft deep loess alluvial deposit,but the loess alluvial deposit will be liquefied under the earthquake with intansity of 7 degree on the present design condition.Therefore,the resistance method of liquefaction should be adopted for the loess foundation.
引文
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[9]孙明权,顾淦臣.土坝抗震的有效应力动力分析研究[J].人民黄河,1999,(6):18-24.Sun M Q,Gu G C.The effective stress method fordynamic analysis of a earth-rock dam during earth-quake[J].Yellow River,1990,(6):18-24.
[10]岑威钧,眭峰,顾淦臣.土质堤坝地震响应的简化有效应力计算方法[J].水力发电,2007,33(12):35-37.Cen W J,Sui F,Gu G C.FEM analysis on resistanceof earthquake impact for earth dike and dam[J].Wa-ter Power,2007,33(12):35-37.
[11]顾淦臣.土石坝地震工程[M].南京:河海大学出版社,1989.115-128.Gu G C.Earthquake Engineering of Earth-rockfillDam[M].Nanjing:Press of Hohai university,1989.115-128.
[2]Seed H B,Martin.Pore water pressure changes dur-ing soil liquefaction[J].Journal of Geotechnical Engi-neering,ASCE,1976,102(4):327-346.
[3]Finn W D,Byren,Martin.Seismic response and liq-uefaction of sand[J].Journal of Geotechnical Engi-neering,ASCE,1976,102(8):841-856.
[4]徐志英,沈珠江.高尾矿坝的地震液化和稳定分析[J].岩土工程学报,1981,3(4):22-32.Xu Z Y,Shen Z J.Liquefaction and stability analysisof a high tailing dam under earthquake excitation[J].Chinese Journal of Geotechnical Engineering,1981,3(4):22-32.
[5]顾淦臣.论土石坝的地震液化验算和坝坡抗震稳定计算[J].岩土工程学报,1981,3(4):33-42.Gu G C.Investigation of the evaluation of liquefactionand slope stability for earth-rock dams[J].ChineseJournal of Geotechnical Engineering,1981,3(4):33-42.
[6]顾淦臣.大伙房土坝砂质坝壳抗震设计回顾[J].岩土工程学报,1990,21(6):675-680.Gu G C.Review of the seismic design for sandy shellof Dahuofang earth dam[J].Chinese Journal ofGeotechnical Engineering,1990,21(6):675-680.
[7]孙明权,顾淦臣,孟祥敏.册田水库南副坝地基砂层液化分析[J].华北水利水电学院学报,1992,(3):51-59.Sun M Q,Gu G C,Meng X M.The liquefactionanalysis for the sand foundation of south auxiliarydam at CETIAN reservoir[J].Journal of North ChinaUniversity of Water Conservancy and Electric Power,1992,(3):51-59.
[8]孙明权,顾淦臣.堤坝边坡地震液化失稳有效应力法分析研究[J].水利学报,1994,(4):63-68.Sun M Q,Gu G C.Embankment slope failure due toearthquake induced liquefaction[J].Journal of Hy-draulic Engineering,1994,(4):63-68.
[9]孙明权,顾淦臣.土坝抗震的有效应力动力分析研究[J].人民黄河,1999,(6):18-24.Sun M Q,Gu G C.The effective stress method fordynamic analysis of a earth-rock dam during earth-quake[J].Yellow River,1990,(6):18-24.
[10]岑威钧,眭峰,顾淦臣.土质堤坝地震响应的简化有效应力计算方法[J].水力发电,2007,33(12):35-37.Cen W J,Sui F,Gu G C.FEM analysis on resistanceof earthquake impact for earth dike and dam[J].Wa-ter Power,2007,33(12):35-37.
[11]顾淦臣.土石坝地震工程[M].南京:河海大学出版社,1989.115-128.Gu G C.Earthquake Engineering of Earth-rockfillDam[M].Nanjing:Press of Hohai university,1989.115-128.
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