新疆吉林台水电站区域稳定性分析

本文根据区域地质构造资料和区域地震活动特征,分析了新疆吉林台水电站区域稳定性。研究结果表明,该站不利之处是位于天山近代总隆起中喀什河断陷谷地内,喀什河活断裂又从库坝区附近通过。但坝址座落在石炭系组成的小断块上,喀什河断裂8级大震的重复发生间隔为2600—4000年,预测今后百年内库坝区发生直下型大震的可能性极小,其地震基本烈度为Ⅷ度是适宜的。

ANALYSIS OF REGIONAL STABILITY OF JILINTAI HYDROPOWER STATION IN XINJIANG

This paper analysed the regional stability of Jilintai hydropower station based on the environment of regional geomorphic geological and the charact-eristics of regional seismic activity. The station is located in the Kashi river graben valley formed by recent total upwarping in Tianshan. It is found out that the strong seismic structure belt of Kashi river lies along the dam site, the fundamental of the dam is made of small fault blocks of volcaniclastic rocks and acidic lava in Carboniferous period. After comprehensive analysis and assessment, it is considered that there is little possibility of magnitude 8 macroseismic dangerous, but exists the possibility of magnitude 5 earthquake along the west of Kashi river fracture zone. The maximum seismic intensity is VII, which may have some effects on the dam.