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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。
Jinping II hydropower station is located in the main river Yalong River Jinping Dahewan, Yalong River is an important cascade on the main power plant, the plant within the terrain ups and downs, belonging to a typical “V ” type of valley. Due to the proximity of the plant to the river valley, the magnitude of the in-situ stress field should be high and the distribution of in-situ stress directions is more complicated. In order to grasp the distribution law and the magnitude of the in-situ stress field in the factory, the in-situ stress measurement of the plant site was used to conduct regression analysis of the in-situ stress field of the plant site according to the valley evolution theory and neural network. The regression results show that the in-site stress should be between 20 ~ 30MPa, belonging to the mid-high stress field, which can induce the rockburst phenomenon. At the same time, it is verified that the combination of valley evolution theory and neural network is an effective method to invert the in-situ stress field in deep-cut valley.