浅谈锁水阁水库大坝水位缓慢降落期的渗流及稳定计算

Seepage and Stability Analysis of the Suoshuige Reservoir Dam in the Water Level Slow Dropping Period

根据对锁水阁水库大坝非稳定渗流的分析,库水位由正常蓄水位缓慢降落至死水位期间(简称"缓慢降落期")的坝体浸润线明显比死水位时的稳定渗流期浸润线要高出很多,且上述库水位的缓慢降落情况并不少见。不论采用瑞典圆弧法还是简化毕肖普法,由此缓慢降落期浸润线计算所得上游坝坡抗滑稳定安全系数均比死水位时稳定渗流期浸润线计算所得的安全系数小很多。瑞典法计算上游坝坡的抗滑稳定安全系数小0.541,毕肖普法计算的小0.529。瑞典法计算库水位缓慢降落期的上游坝坡抗滑稳定安全系数小于规范规定值1.21,不满足要求。

In the water level slow dropping period in the Suoshuige Reservoir, in which the water level slowly drops from the normal storage water level to the dead water level, the phreatic line in the reservoir dam is calculated with unsteady seepage analysis and it is found to be much higher than that in the steady seepage period under the dead water level. Al- so, stability analyses of the dam with the Swedish Circle Method and Bishop Method show that the safety factors of the upper slope against sliding in the water level slow dropping period are much lower than that in the steady seepage period under the dead water level. Specifically, the safety factor with the Swedish Circle Method in the water level slow drop- ping period is smaller than the required value 1.21, which means the stability of the upper slope does not meet the re- auirement.