盖下坝水电站引水隧洞内水外渗对洞线滑坡影响评价

Influence evaluation of water leakage within the diversion tunnel on landslide along the line for Gaixiaba hydropower station

文章叙述了引水洞附近边坡地下水位壅高变化,是由于内水外渗抬高,因地下水渗流速度较慢。以流线表示地下水渗流曲线,采用分段法及其修正,计算其单宽流量及渗出高度,再选取滑动面采用传递系数法进行单宽稳定计算,进而评价其稳定性。

The paper describes thechanges ofgroundwaterbackwater height of the slope near the water diversion tunnel. This groundwater level change is caused by the water leakage within the water diversion tunnel and the slow groundwater flow velocity. Based on the streamline to indicate the groundwater flow curve, the segment method and its amendment method are adopted to calculate the discharge per unit widthand the leakage height.For the selecting sliding surface, the transfer coefficient method is used to calculate the stability of single width. At last, the stability is evaluated.