核电厂边坡地震影响系数研究

Studies on Seismic Influence Coefficience of Slopes near Nuclear Power Plant

比较了不同行业抗震设计规范计算地震影响系数的方法,基于真时程动力分析法,通过设置人工透射边界,研究了典型核电厂边坡三量(位移、速度和加速度)动态放大系数取值,对比了各向同性和各向异性本构情形下的三量动态放大系数分布规律。研究表明:边坡三量增幅随坡高呈先增大后减小再增大的规律,各向异性边坡增幅大于各向同性边坡。当边坡高度超过100m后,边坡出现了三量动态放大系数瘿点,且各向异性边坡的瘿点多于各向同性边坡。计算获得的各向同性边坡动态放大系数取值区间为1.05～1.6,各向异性边坡的动态放大系数取值区间为1.6～2.7。研究成果可指导核电厂边坡的抗震设计,具有较好的应用价值。

Seismic influence coefficient is the seismic response parameter of computing the slopes' earthquake inertia force.The dynamic magnification coefficient of the slope was important to the seismic influence coefficient,and it wasn't homogeneous in space distribution.Nowadays,the numeric area in Anti-quake Architectural Structure Design is 1.0～2.28,while it had no clear conclusions in slope engineering.The numerical methods of earthquake resisting in different industries were reviewed.Based on the real dynamic history analysis method and artificial transmitting boundary,the dynamic magnification coefficient of displacement,velocity and acceleration of typical nuclear power plants' slopes were studied.Then,the earthquake-resistance standards in different industry were compared for both isotropic slopes and anisotropic slopes.The results show that the dynamic magnification coefficient of three indexes increase firstly,and then it decrease,finally it increase again.The amplification of anisotropic slopes increases more than that of the isotropic slopes.When the height of slopes is over 100 m,the burls of dynamic magnification coefficient are growing,and the burls' number of anisotropic slopes increases more than isotropic slopes.The numerical interval of isotropic slopes is 1.05-1.6,while that of anisotropic slopes is 1.6～2.7.This study will provide theoretical and practical meaning to the anti-seismic design of nuclear power plants' slopes,and it has a good application.