土质堤坝地震反应的简化有效应力计算方法
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摘要
详细介绍了一种简便计算土质堤坝地震过程中动孔隙水压力增长的方法--动孔压试验曲线法的基本原理和计算过程。利用该法对一土坝进行了考虑动孔压影响的非线性有效应力动力分析,预测了抗震加固前后大坝可能液化范围和坝坡稳定安全系数,并作比较分析。分析表明,动孔压试验曲线法应用简便,计算结果合理可靠。采用堆石压坡抗震措施能有效地减小大坝的液化度和可能液化范围,同时又能明显提高坝坡抗震的动力稳定性。
The principle and computation process of a calculation method for dynamic pore water pressure for earth dike and dam during earthquake,test curve method for dynamic pore water pressure,were stated in detail.Using this calculation method the dynamic responses of an earth dam were analyzed by non-linear effective stress FEM.The possible liquefacient zones and safety factor for dam slope stability were forecasted before and after strengthening of dam respectively and were compared each other.The investigation shows that the forgoing method for calculation of dynamic pore water pressure is very convenient for application and the results are reasonable and reliable.Besides,the anti-seismic measure using the gravity of rockfill is effective to reduce the liquefaction degree and the scope of possible liquefacient zones,and also to increase the dynamic stability of dam slope during earthquake.
The principle and computation process of a calculation method for dynamic pore water pressure for earth dike and dam during earthquake,test curve method for dynamic pore water pressure,were stated in detail.Using this calculation method the dynamic responses of an earth dam were analyzed by non-linear effective stress FEM.The possible liquefacient zones and safety factor for dam slope stability were forecasted before and after strengthening of dam respectively and were compared each other.The investigation shows that the forgoing method for calculation of dynamic pore water pressure is very convenient for application and the results are reasonable and reliable.Besides,the anti-seismic measure using the gravity of rockfill is effective to reduce the liquefaction degree and the scope of possible liquefacient zones,and also to increase the dynamic stability of dam slope during earthquake.
引文
[1]Seed HB,Martin.Pore water pressure changes during soil lique-faction[C].Proc.ASCE,1976.
[2]Finn WD,Byren,Martin.Seismic response and liquefaction ofsand[C].Proc.ASCE,1976.
[3]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,1981,3(4):22-32.
[4]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.
[5]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,1999,15(3):63-68.
[6]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.
[2]Finn WD,Byren,Martin.Seismic response and liquefaction ofsand[C].Proc.ASCE,1976.
[3]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,1981,3(4):22-32.
[4]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.
[5]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,1999,15(3):63-68.
[6]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.
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