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坝坡稳定是土石坝设计的重要内容,在极端工况条件下,坝体内孔隙水压力常不能很快消散,较高的孔隙水压力和渗透力会使上游坝坡具有下滑趋势,甚至酿成滑坡事故。鉴于此,应用三维非稳定饱和-非饱和渗流有限元法建立大黑箐水库枢纽区三维有限元模型,对极端工况条件下坝体的非稳定渗流场进行模拟分析。结果表明,1d内库水位自校核洪水位骤降至正常蓄水位,不会对心墙的稳定造成不利影响。
Dam slope stability is an important part of design of earth-rockfill dam. Under extreme working conditions, the pore water pressure in the dam body often can not dissipate rapidly. Higher pore water pressure and seepage force will cause the downstream dam slope to decline, Landslide accident. In view of this, a three-dimensional finite element model of Daheipan Reservoir is established by using the three-dimensional unsteady saturated-unsaturated seepage finite element method to simulate the unsteady seepage field of dam under extreme working conditions. The results show that the water level of reservoir water level dropped to the normal water level within 1d, which will not adversely affect the stability of the core wall.