土层分层参数不确定时对二维工程场址地震动影响分析
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摘要
工程场地地震安全性评价中计算二维复杂场地地震反应分析时,如采用一维等效线性化分析模型会带来较大的误差,而直接采用二维的非线性模型在技术上还存在一定的困难和不合理性。目前工程中多采用对一维分析结果进行二维修正的思想给出设计地震动及反应谱。然而在建立二维分析模型时,由于勘测条件的限制使模型建立出现很多不确定性。基于以往提出的二维复杂工程场址设计地震动的修正分析思想,建立了几种可能且工程认可的二维复杂场地模型,主要研究不同分层特征模型及土层剪切波速这一物理参数不确定时对设计地震动的影响,进一步考虑不同场地类别下,不同二维分层模型及土体物理参数对地震动的影响。根据分析结果提出了不同类别场地下,方便且合理建立二维复杂场地地震动分析模型的方法,为实际工程中模型的建立及参数的选取提供一些参考。
The one dimension equivalent linear layer model will bring about significant error used for the typical2 D engineering site under evaluating the safety in earthquake. It is difficult and unreasonable to considering the two-dimension nonlinear model in engineering analysis. The revised methods are often used to take account into2 D ground motion under complex site conditions. When the 2D FEM model is founded,the soil parameters are determined by the test and the shear wave velocity report of boreholes. Due to restrictions of surveying level,the computational FEM models exists a lot of uncertain factors. Based on the presented revised method for theengineering site under the 2D complex site conditions,several reasonable and approval models are established for2 D complex site in engineering. The influences on the design ground motion are discussed,considering the model of different hierarchical features and the physical parameters of soil shear wave velocity. Moreover,the influences on the design ground motion are discussed,considering the above factors under the different site category cases.Based on the computational results,some reasonable suggestions on establishment of 2D complex site models under different site category cases are proposed. Some significant references are provided for choosing the design parameters of ground motion in 2D engineering sites.
The one dimension equivalent linear layer model will bring about significant error used for the typical2 D engineering site under evaluating the safety in earthquake. It is difficult and unreasonable to considering the two-dimension nonlinear model in engineering analysis. The revised methods are often used to take account into2 D ground motion under complex site conditions. When the 2D FEM model is founded,the soil parameters are determined by the test and the shear wave velocity report of boreholes. Due to restrictions of surveying level,the computational FEM models exists a lot of uncertain factors. Based on the presented revised method for theengineering site under the 2D complex site conditions,several reasonable and approval models are established for2 D complex site in engineering. The influences on the design ground motion are discussed,considering the model of different hierarchical features and the physical parameters of soil shear wave velocity. Moreover,the influences on the design ground motion are discussed,considering the above factors under the different site category cases.Based on the computational results,some reasonable suggestions on establishment of 2D complex site models under different site category cases are proposed. Some significant references are provided for choosing the design parameters of ground motion in 2D engineering sites.
引文
[1]中国地震局.GB17741-2005工程场地地震安全性评价技术规范[S].北京:中国标准出版社,2005.
[2]廖振鹏,李小军.地表土层地震反应的等效线性化解法[M]//地震小区划理论与实践.北京:地震出版社.1989,989.
[3]金星,孔戈,丁海平.水平成层场地地震反应非线性分析[J].地震工程与工程振动.2004,24(3):38-43.
[4]杨柏坡,杨笑梅.二维不均匀场地地震地面运动的估算[J].华南地震.1996,16(02):1-9.
[5]杨柏坡,陈庆彬,袁一凡.地震小区划中复杂场地影响的修正方法[J].地震工程与工程振动,1991,11(4):19-27.
[6]杨笑梅,周克森,郭钦华.广东省阳江抽水蓄能电站二维工程场址对设计地震动的影响分析[J].华南地震,2007,27(01):45-50.
[7]廖振鹏.工程波动理论导引[M].北京:科学出版社,1996.
[2]廖振鹏,李小军.地表土层地震反应的等效线性化解法[M]//地震小区划理论与实践.北京:地震出版社.1989,989.
[3]金星,孔戈,丁海平.水平成层场地地震反应非线性分析[J].地震工程与工程振动.2004,24(3):38-43.
[4]杨柏坡,杨笑梅.二维不均匀场地地震地面运动的估算[J].华南地震.1996,16(02):1-9.
[5]杨柏坡,陈庆彬,袁一凡.地震小区划中复杂场地影响的修正方法[J].地震工程与工程振动,1991,11(4):19-27.
[6]杨笑梅,周克森,郭钦华.广东省阳江抽水蓄能电站二维工程场址对设计地震动的影响分析[J].华南地震,2007,27(01):45-50.
[7]廖振鹏.工程波动理论导引[M].北京:科学出版社,1996.
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