Improvement, Testing and Application on Goodman-Bray Method for Stability Analysis of Toppling Slope

In order to confirm the feasibility and applicability of the improved Goodman-Bray method for slope toppling analysis, the in-depth analyses, test and design of the improved method was conducted. The effects of different column width, ground water level and prestress reinforcement of anchors on the slope stability was discussed respectively, based on a number of engineering cases including slopes in the first district of Liushugou, intake high slopes of the release structure at the left bank of Longtan Hydropower Station, slopes in the south of Tianshengqiao No. 2 Hydropower Station. The analyses were conducted on the stability of the topping slope of the release structure at Lianghekou Hydropower Station under construction. The results show that, firstly, the safety factor decreases with the decrease of the column width. Secondly, when water level of inside and outside slope tends to stabilize, the filling of reservoir water has no substantial influence on the stability of the slope. The safety factor of the topping slope dramatically decreases with the rapid drawdown of the outside slope. The application of anchors greatly contributes to the increase of factor of safety. The feasibility of the improved Goodman-Bray method can be further improved in the process of the future design. © 2018, Editorial Department of China Journal of Highway and Transport. All right reserved.