基于动强度模式和时程应力分析的Newmark滑块位移法
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摘要
考虑土的抗剪强度在地震过程中的波动效应,在动强度的基础上将拟静力极限平衡分析与地震动力反应相结合,进行土工建筑物地震永久变形分析。首先,基于土工动力有限元分析确定潜在滑动体的平均角加速度时程和各土条底部的应力时程;进而,基于 Seed 或水科院动强度模式下的拟静力极限平衡分析,确定滑动体的时程抗滑力矩和时程屈服角加速度;最后,采用 Newmark 刚体滑块模型估算滑动体的累计滑动位移。算例计算表明,考虑材料的动强度得到的坝坡滑移量约为仅考虑静强度的坝坡滑移量的1～2倍,结果更为合理。
A simplified procedure for evaluating aseismic stability of slope subjected to earthquake shaking,in which the effect of dynamic shear strength and time-history stress on the yielding angular acceleration of sliding block is taken into account,is presented. The fundamental feature of this procedure is the dynamic shear strength.The numerical computations are performed by using the proposed method.It is shown that the computed sliding displacement for a given core dam,with either method of dynamic shear strength properly considered,is more rational compared with the conventional computational results based on static shear strength.
A simplified procedure for evaluating aseismic stability of slope subjected to earthquake shaking,in which the effect of dynamic shear strength and time-history stress on the yielding angular acceleration of sliding block is taken into account,is presented. The fundamental feature of this procedure is the dynamic shear strength.The numerical computations are performed by using the proposed method.It is shown that the computed sliding displacement for a given core dam,with either method of dynamic shear strength properly considered,is more rational compared with the conventional computational results based on static shear strength.
引文
[1] Newmark.Effects of earthquakes on dams an embankments[J].Geotechnique,1965,15(2) :139-160．
[2] Makdisi F I,Seed H B.Simplified procedure for estimatio dam and embankment earthquake induced deformations[J]Journal of the Geotechnical Engineering Division ASCE,1978,104(GT7) :849-868．
[3] Seed H B.A method for earthquake resistance design o earth dams[J].Journal of Soil Mechanics an Foundation Engineering,ASCE,1966,SM1:13-40．
[4] 汪闻韶.关于土的动力强度和液化特征[M].北京:中国电力出版社,1996．
[5] 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 Geotechnical Engineering,2004,26(5) :691-696．
[6] 陈祖煜.土质土坡稳定分析原理·方法·程序[M].北京:水利水电出版社,2003． 372-373．
[7] DL 5073-2000,水工建筑物抗震设计规范[S].
[8] Jinman K,Nicholas Sitar M.Direct estimation of yield acceleration in slope stability analyses[J].Journal of Geotechnical Geoenvironmental Engineering,2004,130(1) :111-115．
[9] 汪闻韶.在某电厂地基饱和砂性土地震稳定性试验中提出的原理和方法[A].水利水电科学研究院科学研究论文集(16) [C].北京:水利电力出版社,1984．
[10] 左秀泓.饱和无黏性土地震总应力抗剪强度问题[A].水利水电科学研究院科学研究论文集(23) [C].北京:水利水电出版社,1986．
[11] 李湛,栾茂田.考虑强度退化效应的堤坝抗震稳定性评价方法[J].岩土力学,2004,25(增刊2) :409-417． LI Zhan,LUAN Mao-tian.Evaluation of aseismic stability of soil embankments considering cyclic degradation of soil strength[J].Rock and Soil Mechanics,2004,25(2) :409-417．
[12] 常亚屏,刘小生,赵剑明.等.糯扎渡水电站坝料动力特性试验研究报告[R].中国水利水电科学研究院,2003．
[13] Bishop A W.The use of the slip circle in the stability analysis of slopes[J].Geotechnique,1955,(5) :7-17．
[14] 迟世春.堆石坝坝坡的抗震稳定分析[J].世界地震工程,2002,18(4) :11-17．
[2] Makdisi F I,Seed H B.Simplified procedure for estimatio dam and embankment earthquake induced deformations[J]Journal of the Geotechnical Engineering Division ASCE,1978,104(GT7) :849-868．
[3] Seed H B.A method for earthquake resistance design o earth dams[J].Journal of Soil Mechanics an Foundation Engineering,ASCE,1966,SM1:13-40．
[4] 汪闻韶.关于土的动力强度和液化特征[M].北京:中国电力出版社,1996．
[5] 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 Geotechnical Engineering,2004,26(5) :691-696．
[6] 陈祖煜.土质土坡稳定分析原理·方法·程序[M].北京:水利水电出版社,2003． 372-373．
[7] DL 5073-2000,水工建筑物抗震设计规范[S].
[8] Jinman K,Nicholas Sitar M.Direct estimation of yield acceleration in slope stability analyses[J].Journal of Geotechnical Geoenvironmental Engineering,2004,130(1) :111-115．
[9] 汪闻韶.在某电厂地基饱和砂性土地震稳定性试验中提出的原理和方法[A].水利水电科学研究院科学研究论文集(16) [C].北京:水利电力出版社,1984．
[10] 左秀泓.饱和无黏性土地震总应力抗剪强度问题[A].水利水电科学研究院科学研究论文集(23) [C].北京:水利水电出版社,1986．
[11] 李湛,栾茂田.考虑强度退化效应的堤坝抗震稳定性评价方法[J].岩土力学,2004,25(增刊2) :409-417． LI Zhan,LUAN Mao-tian.Evaluation of aseismic stability of soil embankments considering cyclic degradation of soil strength[J].Rock and Soil Mechanics,2004,25(2) :409-417．
[12] 常亚屏,刘小生,赵剑明.等.糯扎渡水电站坝料动力特性试验研究报告[R].中国水利水电科学研究院,2003．
[13] Bishop A W.The use of the slip circle in the stability analysis of slopes[J].Geotechnique,1955,(5) :7-17．
[14] 迟世春.堆石坝坝坡的抗震稳定分析[J].世界地震工程,2002,18(4) :11-17．
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