田湾核电站西边坡抗震稳定性研究

Study on Seismic Stability of West Slope of Tianwan Nuclear Power Station

田湾核电站西边坡为核安全相关边坡,在进行边坡的稳定性评价时,地震作用应根据核电厂的极限安全地震动(万年一遇)确定,且边坡稳定性系数需满足核电厂抗震设计规范要求。在深入研究核电站西边坡工程地质条件的基础上,考虑多种计算工况,采用极限平衡法和有限差分法对边坡的稳定性进行了综合评价。计算结果表明,原田湾核电站西边坡整体是稳定的,但在罕见强震作用下存在局部滑移的风险;经削方治理后的田湾核电站西边坡无论处于天然状态还是罕见强震工况下,边坡都是稳定的,不会对核安全相关建筑构成威胁。

The west slope of Tianwan nuclear power station is a slope related to nuclear safety.When evaluating the stability of the slope,the seismic action should be determined according to the ultimate safe ground motion(once in ten thousand years)of the nuclear power station,and the slope stability coefficient should meet the requirements of the code for seismic design of nuclear power station.Based on the depth study of the engineering geological conditions of the west slope of the nuclear power station,considering various calculation conditions,the stability of the slope is comprehensively evaluated by using the limit equilibrium method and the finite difference method.The results show that the original west slope of Tianwan nuclear power station is stable as a whole,but it still has the risk of local sliding under rare seismic.The west slope of Tianwan nuclear power station formed after excavation process after is stable in both natural and rare seismic conditions,and it will not bring the threat to buildings which related to nuclear safety.