Analysis of slope instability induced by heavy rainfall on a highway

Abstract

Recent heavy rainfall has resulted in a risk of instability on the side slopes of a highway. Using simulation software to construct a finite element analysis model of the slope, the calculated slope stability coefficient does not meet the specification requirements, indicating that the slope is in an unstable state; based on the site investigation data and expert opinion, to determine the "slope reduction + anchor + intercepted drainage" reinforcing program. After analyzing the stress field and displacement field of the slope after reinforcement, the stability coefficient of the slope is 1.41, which is 28.18% higher than that before reinforcement; the study shows that: (1) after reinforcement, the stress on the slope is predominantly concentrated around the reinforcement measures, which clearly demonstrates the effectiveness of the measures in generating substantial stress within the reinforced area; (2) after reinforcement, the maximum displacement of the slope decreased by over 90% in comparison to its pre-reinforcement state, clearly demonstrating the effectiveness of the reinforcement measures in preventing sliding failure of the slope; (3)the stability coefficient of the slope is significantly improved after reinforcement, indicating that the reinforcement program is feasible.