降雨条件下高陡路堑边坡开挖稳定性分析及加固方案研究OA

To study the influence of excavation and rainfall on the stability of high steep road cutting slopes,relying on an actual project,the unsaturated slope seepage and stability were analyzed by a self-programmed calculation program using FLAC3D software,and the corresponding reinforcement optimization scheme was studied through the analysis of the pile spacing of anti-slip piles and the length of the anchoring section.The results indicate that:① The surface soil of the slope is greatly affected by excavation.With the decrease of the excavation slope ratio,the horizontal displacement decreases;the vertical displacement remains basically unchanged,and stress concentration exists at the toe of the slope at all step levels;② The top and toe of the slope are greatly affected after rainfall;the overall displacement increases;the instability increases,and the location of the potential sliding surface moves to the middle and lower parts;③ By comprehensively considering the slope states under rainfall and no-rainfall conditions,an excavation slope ratio of 1:1.5 is the most appropriate;④ By comprehensively analyzing the support effects under rainfall and no-rainfall conditions,it is most suitable when the pile spacing of anti-slip piles is 8 m,and the length of the anchoring section is 13 m.