基于大坝地震响应的参数反演方法研究
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摘要
确定合理的参数是对基于大坝的地震响应进行正确分析的前提,利用反分析理论,探讨了大坝的力学参数确定方法。建立了地震荷载响应下的位移统计模型,推导出改进的目标函数形式,并结合遗传算法,以某大坝为例建立有限元模型,编制计算程序,对系统的力学参数进行优化反演,求出待定参数,进行对比验证。结果表明,反演所得参数准确,说明该方法合理可行,对分析大坝性态有重要参考价值。
Reasonable parameters is the premise of correct analysis for dam.Based on the seismic response of dam,the method of mechanical parameter determination is studied by using back analysis theory.Firstly,the displacement statistical model under seismic load response is built,and a modified objective function is deduced.Then,the finite element model of a dam and the calculation procedure combined with genetic algorithm are developed.Finally,the mechanical parameters of the system are inversed and optimized,as well as verified.The results show that the inversed parameters are correspondingly accurate,and the mechanical parameter method based on the seismic response of dam is reasonable and feasible,which may have significant reference value for analyzing the behaviors of dam.
Reasonable parameters is the premise of correct analysis for dam.Based on the seismic response of dam,the method of mechanical parameter determination is studied by using back analysis theory.Firstly,the displacement statistical model under seismic load response is built,and a modified objective function is deduced.Then,the finite element model of a dam and the calculation procedure combined with genetic algorithm are developed.Finally,the mechanical parameters of the system are inversed and optimized,as well as verified.The results show that the inversed parameters are correspondingly accurate,and the mechanical parameter method based on the seismic response of dam is reasonable and feasible,which may have significant reference value for analyzing the behaviors of dam.
引文
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[6]李瑞友,汤平,李亦明.三峡永久船闸一期工程岩锚预应力监测[J].长江科学院院报,2000,17(1):39-42.
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[9]向衍,苏怀智,顾冲时.基于遗传算法的物理力学参数反演[J].长江科学院院报,2003,20(6):55-58.
[10]Westergaard H M.Water pressures on dams during earth-quakes[J].Transactions.ASCE,1933,98:418-472.
[11]中国水利水电科学研究院.DL 5073-2000.水工建筑物抗震设计规范[S].北京:中国电力出版社,2000.
[2]Gioda G,Maier G.Direct search solution of an inverse prob-lem in elastoplasticity:identification of cohesion,friction an-gle and in-situ stress by pressure tunnel tests[J].Int.J.Num.Meth.Engng,1980,(15):1823-1848.
[3]Giusepptti G.Basic theory underlying the computation of in-fluence coefficients[C]//ISMES,1986:241-247.
[4]Shimizu N,Sakurai S.Application of boundary elementmethod for back analysis associated with tunneling problems[C]//Proc.of 5th Int.Conf.Boundary Elements.Hiroshi-ma,Japan,1983:645-654.
[5]顾冲时,吴中如,吴相豪.碾压混凝土坝安全监控理论和方法[J].水利学报,2002,(9):112-116.
[6]李瑞友,汤平,李亦明.三峡永久船闸一期工程岩锚预应力监测[J].长江科学院院报,2000,17(1):39-42.
[7]吴中如,朱伯芳.三峡水工建筑物安全监测与反馈设计[M].北京:中国水利水电出版社,1999.
[8]顾冲时,吴中如.大坝与坝基安全监控理论和方法及其应用[M].南京:河海大学出版社,2006.
[9]向衍,苏怀智,顾冲时.基于遗传算法的物理力学参数反演[J].长江科学院院报,2003,20(6):55-58.
[10]Westergaard H M.Water pressures on dams during earth-quakes[J].Transactions.ASCE,1933,98:418-472.
[11]中国水利水电科学研究院.DL 5073-2000.水工建筑物抗震设计规范[S].北京:中国电力出版社,2000.
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