江边水电站厂区初始地应力场研究分析

Research and Analysis on Initial Stress Field of Jiangbian Hydropower Station

锦屏二级水电站位于雅砻江干流锦屏大河湾上,是雅砻江干流上的重要梯级电站,厂区内地形起伏较大,属于典型的"V"型河谷。由于厂区靠近河谷,因此其地应力场的量级应该较高,并且地应力方向分布较为复杂。为了掌握厂区地应力场的分布规律和量级,利用厂区的地应力测值,根据河谷演化理论和神经网络对厂区的地应力场进行了回归分析,回归结果表明,厂区的地应力应在20～30MPa,属于中偏高地应力场,可以诱发岩爆现象,同时验证了河谷演化理论和神经网络相结合的方法是反演深切河谷地应力场的有效手段。

Jiangbian Power Station locates at the left bank of Yalongjiang River in Jiulong County,Sichuan Province.There is topographic relief in the plant area,which is a typical v-shaped river valley.Because the plant area is closed to the valley,the magnitude of its ground stress field should be relatively high.In order to understand the distribution and magnitude of the ground stress field in the plant area,we did regression analysis on the ground stress field in the plant area according to the valley evolution theory and neural network based on the ground stress field measured values.The regression results showed that the ground stress field in the plant area should between 20MP and 30MPa,which belongs to higher middle ground stress field and may induce rock burst.At the same time it verified that the combined method of the valley evolution theory and neural network is an effective mean to inverse the ground stress field of deep-incised valley.