面板堆石坝的动力离心模型试验研究
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摘要
为研究面板堆石坝的地震响应规律,采用Parkfield波作为地震动输入,在清华大学50g-t土工离心机上进行了动力离心模型试验。试验在50倍重力加速度条件下采用电液伺服离心机振动台系统完成,采用加速度传感器测量了模型不同位置动力响应的加速度时程并且测量了面板的变形。结果表明,地震最大响应发生于坝顶,该处地震动放大系数接近2。面板坝自下而上存在地震响应放大现象,靠近坝坡上下游位置的加速度响应要大于同高程的坝轴线处的加速度响应;地震作用下面板产生了较为明显的应力和应变,面板上部产生较明显的压应力,下部出现较明显的拉应力;对于弯矩的分布,面板中部较大,在上下部较小。
The study on dynamic responses of CFRD due to earthquake is presented using 50g-t centrifuge shaking table in Tsinghua university subjected to Parkfield ground motion.Acceleration time histories are recorded by acceleration transducers at different locations on the model and the deformations of the face-slab are also measured.The results show that the maximum response occurred at the dam crest where the acceleration factor is near 2.The CFRD response is amplified as the seismic wave propagating upwards through the dam.The responses of the zone adjacent to the upper and lower dam are greater than that of the internal dam.Significant stress and strain occur during the earthquake: compressive stress occurs in the upper part of the face slab while tensile stress occurs in its lower part.The flexural torque occurs in the middle part of the face slab.
The study on dynamic responses of CFRD due to earthquake is presented using 50g-t centrifuge shaking table in Tsinghua university subjected to Parkfield ground motion.Acceleration time histories are recorded by acceleration transducers at different locations on the model and the deformations of the face-slab are also measured.The results show that the maximum response occurred at the dam crest where the acceleration factor is near 2.The CFRD response is amplified as the seismic wave propagating upwards through the dam.The responses of the zone adjacent to the upper and lower dam are greater than that of the internal dam.Significant stress and strain occur during the earthquake: compressive stress occurs in the upper part of the face slab while tensile stress occurs in its lower part.The flexural torque occurs in the middle part of the face slab.
引文
[1]Jian Min Zhang,Ze Yan Yang,Xi Zhang Gao,Zhao Xia Tong.Lessons from Damage to High Embankment Dams in the May12,2008 WenchuanEarthquake[R].GeoShanghai International 2010,Keynote Lecture,ASCE Geotechnical Special Publication,No.201,1-31.
[2]刘小生,王钟宁,汪小刚,等.强震区面板坝大型振动台模型试验及动力分析[R].北京:中国水利水电科学研究院,2000.
[3]杨正权,刘小生,刘启旺,等.猴子岩高面板堆石坝地震模拟振动台模型试验研究[J].地震工程与工程振动,2010,30(5):113-119.
[4]王年香,章为民.混凝土面板堆石坝地震反应离心模型试验[J].水利水运工程学报,2003(1):18-22.
[5]C WWNg,Xiang-Song Li,Paul AVan Laak,et al.Centrifuge modeling of loose fill embankment subjected to uni-axial and bi-axial earthquakes[J].Soil D ynamics&Earthquake Engineering,2004,(24):305-318.
[6]Taylor R N.Centrifuges in modelling:principles and scale effects[C].Taylor R N Geotechnical Centrifuge Technology.Blackie Academic andProfessional,Glasgow,1995.19-33.
[7]南京水利科学研究所院土工所.土工试验技术手册[K].北京:人民交通出版社,2003.
[8]李国英.覆盖层上面板堆石坝防渗墙和面板应力变形的离心模型模拟技术[J].江苏力学,1995(10):47-52.
[9]张建民,于玉贞,濮家骝,等.电液伺服控制离心机振动台系统研制[J].岩土工程学报,2004,26(6):843-845.
[2]刘小生,王钟宁,汪小刚,等.强震区面板坝大型振动台模型试验及动力分析[R].北京:中国水利水电科学研究院,2000.
[3]杨正权,刘小生,刘启旺,等.猴子岩高面板堆石坝地震模拟振动台模型试验研究[J].地震工程与工程振动,2010,30(5):113-119.
[4]王年香,章为民.混凝土面板堆石坝地震反应离心模型试验[J].水利水运工程学报,2003(1):18-22.
[5]C WWNg,Xiang-Song Li,Paul AVan Laak,et al.Centrifuge modeling of loose fill embankment subjected to uni-axial and bi-axial earthquakes[J].Soil D ynamics&Earthquake Engineering,2004,(24):305-318.
[6]Taylor R N.Centrifuges in modelling:principles and scale effects[C].Taylor R N Geotechnical Centrifuge Technology.Blackie Academic andProfessional,Glasgow,1995.19-33.
[7]南京水利科学研究所院土工所.土工试验技术手册[K].北京:人民交通出版社,2003.
[8]李国英.覆盖层上面板堆石坝防渗墙和面板应力变形的离心模型模拟技术[J].江苏力学,1995(10):47-52.
[9]张建民,于玉贞,濮家骝,等.电液伺服控制离心机振动台系统研制[J].岩土工程学报,2004,26(6):843-845.
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