三峡船闸高边坡裂隙岩体渗流监测成果分析

三峡船闸是三峡工程的主要工程之一。闸室区边坡高度一般为70～120m,最高约160m,地下水是影响岩体高边坡稳定的重要因素之一。介绍了船闸高边坡施工期地下水渗流监测的布置和实施情况,根据将近3 a的实际监测成果,分析了施工期船闸高边坡地表降雨、排水、水质、排水硐渗流渗压的变化规律和影响因素;监测成果分析认为,施工期船闸南北边坡地下水位均低于设计水位,与长江科学院计算成果基本一致,随着二期工程的实施,地下水位将随之缓慢降低,说明设计最后选定的渗控方案是基本合理的。

Analysis on seepage of high excavated slopes of cracked rock in the ship locks of Three Gorges

Ship lock was one of the main engineering projects of the Three Gorges Project.The height of the high excavated slopes in the district of ship locks was generally from 70 m to 120 m,and the tallest one was about 160 m.The ground seepage was one of the important factors to affect the stability of high excavated slopes.The arrangement and construction for monitoring of ground seepage in the high excavated slopes during their construction were introduced.Based on the monitoring results during nearly three years,the development and the influence factors(such as the surface raining,drainage,fluid quality discharge and pressure of seepage in drainage hole during the construction of ship lock) were also analyzed.It was shown by monitoring data that the underground water level in north and south sides of ship lock was lower than the design water level which was basically accordant with the result calculated by Yangtze River Scientific Research Institute,and the underground water level would be immediately lowered along with the construction of project.Therefore the design seepage control method was basically reasonable.