Stability evaluation based on slope displacement rate under rainfall action

Abstract

Although the influence coefficient of rainfall on the material strength of slope can be determined, it is difficult to accurately monitor the safety coefficient of road slope under rainfall conditions, and the displacement of slope can be monitored. If the safety condition of the roadbed slope can be judged through the evaluation of the slope rainfall reduction coefficient and slope displacement information, the actual project can be timely supported according to the safety condition and reduce the financial loss of personnel. The global displacement rate of the slope was monitored by the strength reduction method, and the relationship between the safety factor of the slope and the global displacement rate of the monitoring point has been analyzed. The result show that the strength reduction method is reliable; The damage, deformation and failure process of the homogeneous subgrade filled slope are obtained. The slope safety factor is related to the displacement rate. By analyzing the relationship between the displacement rate of monitoring points on the side slope and the stability state of the slope, all points are basically the same, which also provides a certain basis for evaluating the stability and safety of the slope. When the displacement rate is less than 8~10 m/s, the slope appears local instability phenomenon, the slope foot displacement is large, the slope top displacement is small. At this time, the slope soil is in the limit equilibrium state, and timely support is needed. When the displacement rate reaches 7~10 m/s, the slope will lose stability as a whole and slide along the circular arc sliding surface. At this time, the displacement of monitoring points in the sliding surface of all the slopes is large, and there is almost no difference, which indicates that the slope has slipped.

Keywords

slope deformation rate / slope stability / rainfall reduction / slope failure