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官厅水库所在的延怀盆地有多条活动断层分布 ,新构造运动强烈。官厅水库大坝安全与否事关首都安全。为此 ,文中采用有限元方法结合断层位移资料 ,模拟了延怀盆地的现代构造应力场 ;参照模拟的结果 ,结合前人的研究成果 ,对设定地震的烈度进行了拟合 ,讨论了设定地震对大坝的影响。对官厅水库大坝的地震安全性进行了评价。结果表明 :1)延怀盆地最大主压应力方向为N80°～ 85°E ;2 )可能的发震断层为方家冲 -营门矿段断层 ;3)考虑大坝坝址的工程地质条件、发震断层与大坝的空间位置关系、历史大地震对大坝的影响等因素 ,则大坝的地震危险性将有所提高
The Yanhuai basin where the Guanting Reservoir is located has a number of active faults distributed and the Neotectonic movement is intense. Guanting reservoir dam safety or not related to the capital security. In this paper, the finite element method is used to simulate the modern tectonic stress field in Yanhuai Basin based on the data of fault displacements. According to the results of previous simulations and the results of previous studies, the seismic intensity is set up. The impact of earthquakes on the dam. The seismic safety of the Guanting Reservoir Dam was evaluated. The results show that: 1) the direction of maximum principal compressive stress in Yanhuai Basin is N80 ° ~85 ° E; 2) the possible seismogenic fault is the fault of Fangjiachong-Yingmen section; 3) the engineering geological conditions , The relationship between the seismogenic fault and the dam’s spatial location, the influence of the historical earthquake on the dam, etc., the seismic risk of the dam will be raised