关键词: 坝坡稳定, 相对安全率, 安全系数, 高土石坝

Abstract:

With the development of earth rock dam construction technology, the height of the earth rock dam is increasing; however, the design specification adopted by the designer in the construction of earth rock dam over 200 m is for the earth rock dams lower than 200 m, so the relative specifications needs perfection. The stability safety factors of earth rock dam slope with different dam height, slope ratios and seismic intensity are obtained based on the theory of relative safety ratio, and the variation law of the stability safety factor of earth rock dam over 200 m is made clear. The permitted slope stability reliable indicator of 4.2 is determined for dams over 200 m. The relative safety ratios of traditional method and reliability method are calculated, and the linear regression for the results is conducted. It shows that for earth rock dams over 200 m, when the slope stability safety factor is 1.6 in normal case and 1.3 in earthquake case, its risk level equals to that of the allowed reliable indicator of 4.2.

Key words: slope stability, relative safety ratio, safety factor, high earth rock dam