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将土体简化为Hardin-Drnevich等效线性模型,运用有效应力动力分析方法,得到SL1和SL2地震动作用下某核电导流堤的稳定安全系数、液化区分布以及震后残余变形。分别采用整个地震过程中的最小安全系数和最小平均安全系数评价了导流堤的稳定性,对计算结果进行了比对。SL1地震动作用下,导流堤地基砂土液化范围较小,不会影响导流堤结构的正常使用;SL2地震动作用下,导流堤地基土层中的砂土发生了大面积的液化,导流堤发生了较大的变形,但不至于使导流堤整体向渠心滑移,不会影响到核电厂的安全用水。本文成果对类似工程抗震设计具有一定的参考价值和指导意义。
The soil is simplified as Hardin-Drnevich equivalent linear model, and the effective safety factor and dynamic analysis method are used to obtain the stability and safety factor, distribution of liquefaction zone and post-earthquake residual deformation of nuclear diversion dike under the action of SL1 and SL2 earthquakes. The stability of the dike is evaluated by using the minimum safety factor and the minimum average safety factor respectively during the whole earthquake. The results of the calculation are compared. Under the action of SL1 earthquakes, the sand liquefaction range of the foundation of the diversion embankment is small and will not affect the normal use of the diversion dike structure. Under the action of SL2 earthquakes, a large area of liquefaction occurs in the sand soil in the foundation layer of the diversion dike , The diversion dykes have undergone major deformations, but they will not cause the whole of the diversion dykes to slip to the core and will not affect the safe water supply of nuclear power plants. The results of this paper have certain reference value and guiding significance for similar engineering seismic design.