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以田湾核电5-8号机组第一阶段取水明渠工程北导流堤实际工程为背景,详细阐述了核电规范规定的3种稳定性分析方法,即滑动面法、静力有限元法和动力有限元法。运用Geo-slope软件分析导流堤抗震稳定性,计算出在不同地震动SL1和SL2条件下滑动面位置和最小安全系数。SL1条件下安全系数大于1;对SL2条件下安全系数小于1,导流堤发生瞬时失稳的情况,进行了Newmark滑移量分析,但由于非线性地基土液化区的存在,需进一步应用有效应力动力分析方法进行补充分析,结果表明:SL1地震动作用下,导流堤稳定性良好;SL2地震动作用下虽发生瞬时失稳,但变形量很小,仍然具有安全性。计算方法和分析成果对类似核电导流堤抗震稳定分析具有一定的指导和借鉴作用。
Based on the actual project of the North Diversion Canal of the intake quarantine works of the first stage of Unit 5-8 of Tianwan Nuclear Power Plant, three kinds of stability analysis methods stipulated in the nuclear power code are elaborated in detail, namely the sliding surface method, the static finite element method and the dynamic Finite element method. Geo-slope software was used to analyze the seismic stability of the diversion dyke, and the sliding surface position and minimum safety factor were calculated under different ground motions SL1 and SL2. The safety factor under SL1 is greater than 1. The Newmark slippage analysis is carried out under the condition that the safety factor under SL2 is less than 1 and the transient embankment instability occurs. However, due to the existence of soil liquefaction zone in nonlinear foundation soil, the safety factor needs further application The results show that the stability of the dike is good under the action of SL1 earthquakes, and the stability is good under the action of SL2 earthquakes, but the deformation is very small, which is still safe. The calculation methods and analysis results have some guidance and reference for the seismic stability analysis of nuclear diversion dike.