传递函数在地下工程地震响应研究中的应用
详细信息 本馆镜像全文    |  推荐本文 | | 获取馆网全文
摘要
将传递函数引入地下工程地震响应的研究,提出利用传递函数进行地下工程地震响应的频谱特性分析、地震响应时频估算以及地震动输入频谱修正的3种应用方法。基于白鹤滩水电站13#机组剖面地下洞室群,对这3种方法进行了探讨及检验。结果表明:传递函数可清晰表达地下工程在地震动作用下的输入、输出关系,描述洞室群各部位的动力特性,且与其他频谱特性研究方法得出的结论相一致。在自下而上的地震剪切波作用下,洞室底板部位的响应整体强于顶拱部位,且具有不同的主频段;但在3~4 Hz频段,顶拱的动力响应强于底板。采用有限带宽随机白噪声算得洞室群各部位的传递函数,再根据传递函数进行实际地震响应时频估算的方法是可行的,估算与验算结果吻合良好,该方法可以大幅度减少计算量,使得根据有限的计算结果把握特定工程的整体动力响应特征成为可能。根据已有研究成果,取洞室底部或河谷水面为地震响应的频谱控制点,基于传递函数对输入地震动时程进行频谱修正,可保证地下工程动力响应地震动输入机制的合理性。
Based on transfer function,the three procedures of spectral characteristics analysis,seismic response time-frequency estimation,and the spectral correction for input ground motion are proposed.Discussion and verification for these procedures are made based on the seismic analysis of Baihetan hydropower station underground power houses.The results indicate that the seismic input-output relation for underground engineering can be clearly expressed by transfer function.The results are well consistent with the conclusion made by the other methods.Generally the response of floor may be stronger than that of crown,and may contain different main frequency bands.However the response of floor is smaller than that of crown in the band of 3-4 Hz.The method of seismic response time-frequency estimation made with transfer function and based on white noise calculation is feasible.It is believed that this procedure can greatly reduce the time-consuming computation,and makes it possible to grasp the main seismic response characteristics of target project with limited amount of computation.Moreover,the correction of spectral characteristics for the input ground motion to correspond with the spectral reference points of carven bottom or the water level of valley can guarantee the reasonable mechanism of the input ground motion.
引文
[1]张雨霆,肖明,李玉婕.汶川地震对映秀湾水电站地下厂房的震害影响及动力响应分析[J].岩石力学与工程学报,2010,29(增刊2):3663-3670.ZHANG Yu-ting,XIAO Ming,LI Yu-jie.Effect ofWenchuan earthquake on earthquake damage anddynamic response analysis of underground powerhouse ofYingxiuwan hydropower station[J].Chinese Journal ofRock Mechanics and Engineering,2010,29(Supp.2):3663-3670.
    [2]李海波,马行东,邵蔚,等.地震波参数对地下岩体洞室位移特性的影响分析[J].岩石力学与工程学报,2005,24(增刊1):4627-4634.LI Hai-bo,MA Xing-dong,SHAO Wei,et al.Influence ofthe earthquake parameters on the displacement of rockcavern[J].Chinese Journal of Rock Mechanics andEngineering,2005,24(Supp.1):4627-4634.
    [3]崔臻,盛谦,刘加进,等.基于小波包的地下洞室群地震响应及其频谱特性研究[J].岩土力学,2010,31(12):3525-3530.CUI Zhen,SHENG Qian,LIU Jia-jin,et al.Spectrumcharacteristics analysis of seismic response forunderground houses via wavelet packet[J].Rock and SoilMechanics,2010,31(12):3525-3530.
    [4]李小军,卢滔.水电站地下厂房洞室群地震反映显式有限元分析[J].水力发电学报,2009,28(5):41-46.LI Xiao-jun,LU Tao.Explicit finite element analysis ofearthquake response for underground caverns ofhydropower stations[J].Journal of HydroelectricEngineering,2009,28(5):41-46.
    [5]傅志方,华宏星.模态分析理论与应用[M].上海:上海交通大学出版社,2000.
    [6]BERND GIROD,RUDOLF RABENSTEIN,ALEXANDER STENGER.Signals and systems,2nded[M].New York:Wiley,2001:50.
    [7]The MathWorks Inc..MATLAB signal processing toolboxuser's guide[R].Natick:The MathWorks Inc.,2010.
    [8]郭明珠,谢礼立,闫维明,等.体波地脉动单点谱比法研究[J].岩土力学,2003,24(1):109-112.GUO Ming-zhu,XIE Li-li,YAN Wei-ming,et al.Spectralratio of horizontal to vertical component research forbody wave microtremors[J].Rock and Soil Mechanics,2003,24(1):109-112.
    [9]蒋良潍,姚令侃,吴伟,等.传递函数分析在边坡振动台模型试验的应用探讨[J].岩土力学,2010,31(5):1368-1374.JIANG Liang-wei,YAO Ling-kan,WU Wei,et al.Transfer function analysis of earthquake simulationshaking table model test of side slopes[J].Rock and SoilMechanics,2010,31(5):1368-1374.
    [10]林鹏,卓家寿.岩质高边坡开挖爆破动力特性的传递函数研究[J].河海大学学报,1997,25(6):122-125.
    [11]吕涛,李海波,杨建宏,等.溪洛渡地下洞室群地震响应的二维及三维数值模型比较分析研究[J].岩土力学,2009,30(3):721-728.LüTao,LI Hai-bo,YANG Jian-hong,et al.Comparisonbetween 2D and 3D numerical analysis for seismicresponse of Xiluodu underground caverns[J].Rock andSoil Mechanics,2009,30(3):721-728.
    [12]胡进军.地下地震动参数研究[硕士学位论文D].哈尔滨:中国地震局工程力学研究所,2003.
    [13]张玉敏,盛谦,朱泽奇,等.深度衰减效应对大型地下洞室群强震响应的影响分析[J].岩土力学,2010,31(10):3197-3208.ZHANG Yu-min,SHENG Qian,ZHU Ze-qi,et al.Influence of depth attenuation on seismic response oflarge underground cavern group[J].Rock and SoilMechanics,2010,31(10):3197-3208.
    [14]陈厚群.坝址地震动输入机制探讨[J].水利学报,2006,37(12):1417-1423.CHEN Hou-qun.Disscussion on seismic inputmechanism at dam site[J].Journal of HydraulicEngineering,2006,37(12):1417-1423.
    [15]YAMAGUCHI Y,IWASHITA T.Earthquake motions atan embankment dam base and an estimation method ofincident seismic waves using the observations[C]//The32nd Joint Meeting of the U.S.-Japan CooperativeProgram in Natural Resources Panel on Wind and SeismicEffects.Gaithersburg:[s.n.],2001:253-262.

版权所有:© 2023 中国地质图书馆 中国地质调查局地学文献中心