关键词: 谷幅变形, 岩体, 稳定性

Abstract: In order to study the valley deformation and slope stability of the dam area of Wudongde hydropower station on Jinsha River, the high slope of the plunge pond behind the dam is taken as an example. Based on the monitoring results of the slope, the stability of slope and the development law of valley deformation are analyzed. The stability of high slopes at both sides of the dam area is calculated by using the finite element method with selected typical sections. The simulation results have good consistency with the slope monitoring results during excavation. The monitoring results reveal the general law of valley deformation, show that excavation disturbances will accelerate the rheological deformation of the rock mass in the dam area. It is reasonable and feasible to analyze and evaluate the slope stability of dam area by deformation monitoring combined with simulation. This intuitive and adaptable method can take into account of the large non-linear deformation of rock mass, quickly obtain the safety factor of slope, and conveniently simulate the process of instability and failure of any landform and sliding surface.

Key words: valley deformation, rock mass, stability