Abstract: Since the impoundment of the reservoir in May1998, Ertan Hydropower Project has been in safety operation for 5 years. According to the stability study results before and after reservoir impoundment , along with the preliminary stability assessment based on the long-term observation data, it has been concluded that the landslide mass is stable with margin. Considering some unfavorable factors has still existed,and the landslide mass is close to the dam, the stability of the landslide mass is very important to the whole project, and has been fully concerned. Therefore, a long-term monitoring is required. To save investment,it is suggested that the observation frequency should be reduced while the observation period should be extended. When abnormity occurred, the observation frequency shall be increased.?

摘要： 二滩水电站自1998年5月下闸蓄水形成水库以来,己安全运行了5a。本文总结了建库前后,近坝库岸霸王山古滑坡体的稳定性研究成果,并根据较长期的观测资料分析,对滑坡体的稳定性进行了初步评价,得出了滑坡体在水库蓄水前和水库蓄水后,至今均处于稳定状态,并有一定的安全裕度的基本结论。但考虑到坡体仍存在一些不利因素,并且,滑坡体距大坝又很近,它的稳定对整个工程的安全至关重要,因此,进行较长时期不间断的有效监测仍十分必要。但为了节约人力和物力,可将观测频次适当降低,周期适当延长,若发现有异常时再加密。