微风化花岗岩动弹模取值研究
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摘要
通过粤东地区一组微风化花岗岩动弹模试验数据的概率密度曲线和累积分布曲线,发现现行规范建议的取值方法存在可靠度不足或过于保守的问题。针对大样本时标准值可靠度下降的情况,建议基于试验数据的累积分布曲线或核密度估计分布进行可靠度估值。通过建立均质弹塑性有限元模型,赋予不同的动弹模进行了动力分析。微风化花岗岩的放大谱和模型顶部反应谱显示,基于核密度估计的可靠度估值能反映动弹模的不确定性。考虑地震动频谱成分的不确定性,动弹模的高值和低值均属不利组合。
According to the probability density curves and cumulative distribution curves of the dynamic elastic modulus which are acquired in the east of Guangdong Province,it is found that the reliability of the evaluation proposed by the current codes is either deficient or conservative.In view of the large samples that contribute to the decline of the reliability,the reliability evaluation based on the test cumulative distribution curves or kernel density estimate distribution is recommended.A series of seismic analysis are processed on slightly weathered granite by using the finite model with different dynamic elastic modulus.The amplification spectrum of models and the response spectra of the model top show that the reliability evaluation based on kernel density estimate can consider the uncertainty of dynamic elastic modulus.Considering the uncertainty of the earth quake spectrum,both the high and low values of the dynamic elastic modulus are the unfavourable combination.
According to the probability density curves and cumulative distribution curves of the dynamic elastic modulus which are acquired in the east of Guangdong Province,it is found that the reliability of the evaluation proposed by the current codes is either deficient or conservative.In view of the large samples that contribute to the decline of the reliability,the reliability evaluation based on the test cumulative distribution curves or kernel density estimate distribution is recommended.A series of seismic analysis are processed on slightly weathered granite by using the finite model with different dynamic elastic modulus.The amplification spectrum of models and the response spectra of the model top show that the reliability evaluation based on kernel density estimate can consider the uncertainty of dynamic elastic modulus.Considering the uncertainty of the earth quake spectrum,both the high and low values of the dynamic elastic modulus are the unfavourable combination.
引文
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[3]吕涛,杨球玉,耿学勇等.岩石坚硬程度对核电厂地基—基础地震响应特征的影响分析[J].岩土力学,2010,31(4):1319～1325.
[4]李忠诚.考虑土—结构相互作用效应的核电厂地震响应分析[D].天津:天津大学博士论文,2007.
[5]吴长富,朱向荣,刘雪梅.基于现行规范岩土参数的统计方法分析及应用[J].工程勘察,2005,(3):5～7.
[6]E.Parzen.On estimation of a probability density function andmode[J].The Annals of Mathematical Statistics,1962,33(3):1065～1076.
[7]M.P.Wand,M.C.Jones.Kernel smoothing[M].London:Chapman&Hall/CRC,1995.
[8]B.W.Silverman.Density estimation for statistics and dataanalysis.[M].London:Chapman&Hall/CRC,1998.
[9]ASCE.ASCE4-98.Seismic analysis of safety-related nuclearstructures and commentary[S].Reston,VA:AmericanSociety of Civil Engineers,2000.
[10]张晓.核电站反应堆厂房不均匀岩石地基地震动力响应分析[D].广州:中山大学硕士论文,2011.
[11]R.L.KUHLEMEYER,J.LYSMER.Finite element methodaccuracy for wave propagation problems[J].Journal of the SoilMechanics and Foundations Division,ASCE,1973,99(5):421～427.
[12]FLAC3D(Fast Lagrangian Analysis of Continua in3Dimensions)Optional Features(Version3.0)[M].Minnesota:Itasca Consulting Group,Inc,2005.
[13]吴健,金峰,张楚汉等.无限地基辐射阻尼对溪洛渡拱坝地震响应的影响[J].岩土工程学报,2002,24(6):716～719.
[14]孙剑平,朱晞.考虑土非线性层状场地地震反应计算方法[J].岩石力学与工程学报,2001,20(2):220～224.
[15]NRC Regulatory Guide1.60-1973.Design response spectra forseismic design of nuclear power plants[S].
[16]胡聿贤.地震工程学(第二版)[M].北京:地震出版社,2006.
[17]大崎顺彦.地震动的谱分析入门(第二版)[M].田琪译.北京:地震出版社,2008.
[18]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):3197～3202,3208.
[19]高玉峰,刘汉龙,朱伟等.剪切波速对砂土层地震反应的影响[J].工程勘察,2001,(1):39～42.
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