Abstract: In the paper,the seism ic damage to reservoirs in Sichuan Province has been analyzed by field in-vestigation and data collection of the damages of the M_S8.0 W enchuan earthquake.The results show that the damage of the M_S8.0 W enchuan earthquake is 1 or 3 degrees higher than the seism ic intensi-ties provided by the reservoir seism ic safety assessments in Sichuan Province.This reveals certain questions behind the reservoir seism ic safety assessment in this region.Because of the short earth-quake record history,there has been no pred icting of earthquake larger than the largestmagnitude of historical earthquake,and thus,the risk of the Lomenshan active faultwas greatly underestimated,re-sulting that fissures,seepage and partial collapse occurred widely on the dams ofmany reservoirs.The paleoearthquake method is an importantmeans of d istinguishing active fault in reservoir seism ic risk assessment and improving the accuracy and reliability of the assessment results.

Key words: M_S8.0 W enchuan earthquake, seism ic safety assessment, reservoir

摘要： 通过对汶川M_S8.0地震的野外现场调查与相关资料收集,分析了四川省水电水利工程的破坏情况。在汶川地震震中区和高烈度区内,其危害性程度明显比当地水电水利工程场地安全性评价烈度高Ⅰ～Ⅲ度,暴露出在当地水电水利工程场地安全性评价中存在的问题。受限于历史地震记录时间短、无法预测出超过历史地震最高震级的上限,严重低估了龙门山断裂带的危险性,酿成当地水电水利工程遭受很大损坏,坝体普遍出现裂缝、渗水、局部坍塌等情况,甚至有些水库出现溃坝险情。因此,在水电水利工程场地安全性评价中应加强活动断裂的鉴定工作,可以利用古地震或地震规模与最大震级关系等来弥补历史地震资料记录时间短的缺陷,以提高水电水利工程场地安全性评价结果的可靠性。

关键词: 汶川M_S8.0地震, 地震安全性评价, 水电水利工程