The theoretical model created based on minimum principal stress criteion is a new thinking of the three dimensional geo-stress measurements made by hydraulic fracturing method. 采用最小主应力破坏准则,建立理论模型,是利用水压致裂方法进行三维地应力测量的新的研究思路和方法。
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。