The ratio between major and minor principal stresses basically keeps stable, while it varies between filling and impoundment periods. 大主应力与小主应力之比基本保持恒定，但填筑期及蓄水期的比值大小不同。
After one year's impoundment of the reservoir, the eco-environment of the middle and lower Yangtze is briefly presented in this paper. 本文对三峡工程蓄水一年来有关长江中下游的生态环境进行介绍。