Deformation Mechanism and Reinforcement Effect for Slope Excavated in Complex Accumulative Formation

For a high excavation slope of a converter station in a power engineering project, the stability and deformation characteristics of the slope were analyzed using the limit equilibrium method and the strength reduction method, respectively. The results showed that the stability of the slope is significantly affected by rainfall and earthquakes. The slope was in an unstable state under both working conditions. Earthquake induced damage to the accumulation structure of slope zones. Not only does it reduce the overall stability of the slope, but it also promotes the extensive development of cracks within the slope. It was beneficial for rainfall infiltration and further deteriorating the hydrogeological conditions of the slope, and it caused an increase in pore water pressure and a decrease in effective stress in the slope. The slope reinforcement design adopted the support measures of pile sheet wall and lattice anchor rod. The stability coefficient of the reinforced slope reached 1.406, and the maximum total displacement decreased from 425 mm before reinforcement to 9 mm. It significantly improved slope stability and indicated that the protection plan can ensure the safety of the slope and achieve the purpose of prevention and risk control.