库底淤泥层对拱坝地震动水压力的抑制效应研究
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摘要
地震时库底淤泥对大坝产生的动水压力影响明显,尤其拱坝受地震作用时,坝面动水压力变化与淤泥层厚度、边界条件、基岩性质等因素直接相关。基于此,以压力波理论为出发点,结合数值配点分析法,对拱坝坝面动水压力随淤泥层厚度、库底边界反射条件、库底基岩性质变化而产生的影响效应问题进行了研究。结果表明:淤泥层对大坝坝面地震动水压力有较好的抑制效应,可一定程度减缓地震对大坝工程的影响,库底边界吸收性亦可一定程度上降低坝面动水压力峰值。
Silt stratification could considerably influence the hydrodynamic pressure of reservoir dam during earthquake,especially,hydrodynamic pressure of arch dam is directly related with silt depth,boundary conditions and bedrock feature.Based on the theory of pressure wave,Numerical Fitting-point method has been applied to study the effect of hydrodynamic pressure from silt depth,reflection boundary and bedrock feature for arch dam.It showed that silt stratification may produce prominent depression effect on hydrodynamic pressure of dam surface and decrease the seismic motion to some extend,absorbability of submarine boundary can also reduce the peak value of hydrodynamic pressure of dam surface.
Silt stratification could considerably influence the hydrodynamic pressure of reservoir dam during earthquake,especially,hydrodynamic pressure of arch dam is directly related with silt depth,boundary conditions and bedrock feature.Based on the theory of pressure wave,Numerical Fitting-point method has been applied to study the effect of hydrodynamic pressure from silt depth,reflection boundary and bedrock feature for arch dam.It showed that silt stratification may produce prominent depression effect on hydrodynamic pressure of dam surface and decrease the seismic motion to some extend,absorbability of submarine boundary can also reduce the peak value of hydrodynamic pressure of dam surface.
引文
[1]Wang Zhong.Research of dam-reservoir interaction and damisolations[D].Sichuan Univ.,2002.[王忠.坝库相互作用及抗震技术研究[D].四川大学,2002.]
[2]Chen Houqun.The main problems and developments inseismic studies on hydraulic structures in China[J].Journalof Vibration Engineering,1997,10(3):253-257.[陈厚群.当前我国水工抗震中的主要问题和发展动态[J].振动工程学报,1997,10(3):253-257.]
[3]Lin Gao.Developing tendency of the seismic safety evalua-tion of large concrete dams[J].Journal of Disaster Preven-tion and Mitigation Engineering,2006,26(1):1-12.[林皋.混凝土大坝抗震安全评价的发展趋向[J].防灾减灾工程学报,2006,26(1):1-12.]
[4]Westergaard H M.Water pressures on dams during earth-quakes[J].Transactions,ASCE,1933,98:418-472.
[5]Ling Changyu,John LT.Three-dimensional dynamic analy-sis of dam-water-sediment systems[J].Journal of Engineer-ing Mechanics,1987,113(12):1945-1958.
[6]Maheri M R,Khodaei-Nassaj MR.Dynamic solution of 3-Dstructure-fluid system using a newlagrangian-based curvilin-ear fluid element[J].Dam Engineering,1887,8:83-122.
[7]Clough R W.Reservoir interaction effects on the dynamicresponse of arch dams[C]//Proceedings of China-US Bilat-eral Workshop on Earthquake Engineering,1982:58-84.
[8]Alexander MU,Angelinque A.Base isolation structures re-sistant control theory and application of base isolation in rus-sia[C]//Proceeding of the 1998 ASME/JSME Joint Pres-sure Vessels and Piping Conference,PVP-Vol.379,Seis-mic,shock and Vibration Isolation,ASME,1998:71-78.
[9]Hanchen T,Chopra A K.Earthquake analysis of arch damsincluding dam-water-foundation rock interaction[J].Earth-quake Engineering and Structural Dynamics,1995,24:1453-1474.
[10]Hanchen T,Chopra A K.Dam-foundation rock interactioneffects in earthquake response of arch dams[J].Journal ofStructural Engineering,ASCE,1996,122(5):528-538.
[2]Chen Houqun.The main problems and developments inseismic studies on hydraulic structures in China[J].Journalof Vibration Engineering,1997,10(3):253-257.[陈厚群.当前我国水工抗震中的主要问题和发展动态[J].振动工程学报,1997,10(3):253-257.]
[3]Lin Gao.Developing tendency of the seismic safety evalua-tion of large concrete dams[J].Journal of Disaster Preven-tion and Mitigation Engineering,2006,26(1):1-12.[林皋.混凝土大坝抗震安全评价的发展趋向[J].防灾减灾工程学报,2006,26(1):1-12.]
[4]Westergaard H M.Water pressures on dams during earth-quakes[J].Transactions,ASCE,1933,98:418-472.
[5]Ling Changyu,John LT.Three-dimensional dynamic analy-sis of dam-water-sediment systems[J].Journal of Engineer-ing Mechanics,1987,113(12):1945-1958.
[6]Maheri M R,Khodaei-Nassaj MR.Dynamic solution of 3-Dstructure-fluid system using a newlagrangian-based curvilin-ear fluid element[J].Dam Engineering,1887,8:83-122.
[7]Clough R W.Reservoir interaction effects on the dynamicresponse of arch dams[C]//Proceedings of China-US Bilat-eral Workshop on Earthquake Engineering,1982:58-84.
[8]Alexander MU,Angelinque A.Base isolation structures re-sistant control theory and application of base isolation in rus-sia[C]//Proceeding of the 1998 ASME/JSME Joint Pres-sure Vessels and Piping Conference,PVP-Vol.379,Seis-mic,shock and Vibration Isolation,ASME,1998:71-78.
[9]Hanchen T,Chopra A K.Earthquake analysis of arch damsincluding dam-water-foundation rock interaction[J].Earth-quake Engineering and Structural Dynamics,1995,24:1453-1474.
[10]Hanchen T,Chopra A K.Dam-foundation rock interactioneffects in earthquake response of arch dams[J].Journal ofStructural Engineering,ASCE,1996,122(5):528-538.