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
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摘要
考虑核电厂地基-基础的动力相互作用,应用显式动力有限差分法分析了地震作用下极软岩、较软岩、坚硬岩上核电厂建筑结构基础的地震响应特征,比较了岩石坚硬程度对基础加速度反应谱的影响。研究表明:随着岩石坚硬程度的提高,核电厂建筑物结构基础的地震响应有增加的趋势;在周期轴上,基础处的加速度反应谱曲线会随着岩石坚硬程度的提高逐渐向短周期(高频段)方向移动。在高频段,建造于较坚硬岩石上基础结构的加速度反应谱值偏大;在中等频段,建造于较软岩石上基础结构的加速度反应谱值偏大;在低频段,岩石坚硬程度对加速度反应谱的影响不显著。
With the consideration of dynamic bedrock-structure interaction of nuclear power plant,explicit dynamic finite difference method is used in this paper;therefore,to analyze the characteristics of seismic response of the foundation of those nuclear power plants built on very soft bedrock,less softer bedrock and hard rock respectively,and to study the influence of rock hardness on the acceleration spectrum of the foundation.The research shows that:Seismic response of the foundation of the nuclear power plant increases if bedrock becomes harder and acceleration response spectrum moves to the shorter period(i.e.higher frequency domain) on the period axis with the increase of the rock hardness;In the high frequency domain,acceleration response spectrum of the foundation constructed on the harder rock is higher;for medium frequency domain,softer rock results in higher acceleration response spectrum;and rock hardness has little impact on the acceleration response spectrum in the low frequency domain.
With the consideration of dynamic bedrock-structure interaction of nuclear power plant,explicit dynamic finite difference method is used in this paper;therefore,to analyze the characteristics of seismic response of the foundation of those nuclear power plants built on very soft bedrock,less softer bedrock and hard rock respectively,and to study the influence of rock hardness on the acceleration spectrum of the foundation.The research shows that:Seismic response of the foundation of the nuclear power plant increases if bedrock becomes harder and acceleration response spectrum moves to the shorter period(i.e.higher frequency domain) on the period axis with the increase of the rock hardness;In the high frequency domain,acceleration response spectrum of the foundation constructed on the harder rock is higher;for medium frequency domain,softer rock results in higher acceleration response spectrum;and rock hardness has little impact on the acceleration response spectrum in the low frequency domain.
引文
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[4]中华人民共和国国家核安全局.核安全导则汇编(下册)[M].北京:中国法制出版社,1998.
[5]《工程地质手册》编委会.工程地质手册[M].北京:中国建筑工业出版社,2007.
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[12]刘晶波,杜修力.结构动力学[M].北京:机械工业出版社,2005.
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