关键词: 杨房沟水电站, 高陡边坡, 开挖变形, 稳定性, 数值模拟

Abstract: In the excavation construction of the high and steep slope on the left bank of Yangfanggou hydropower station, the 3D numerical modeling method is used to analyze the deformation characteristics and the stability of slope during excavation. In the process, it is found that the potential deformation or instability area in the upper part of the slope is mainly distributed in the vicinity of the opening line, which results in some risk of local instability after combination of the excavated faults. The excavation mainly changes the stability of rock mass in the area of excavation and its vicinity, while the stability of the rock mass outside the area is not significantly affected. The deformation of middle and upper part of excavated area is mainly the unloading rebound deformation in the vertical direction. The overall deformation value of the slope is relatively low. The calculation and analysis method can be used for reference in the excavation design of similar projects.

Key words: Yangfanggou hydropower station, high and steep slope, excavation deformation, stability, numerical simulation