Abstract：Stability of high cut slope is influenced significantly by many factors such as rainfall and excavation， especially with faulty geology. Therefore，it is necessary to simulate excavation operation and analyze monitoring data in time for dynamic construction design. As a typical example，K108+208～+466 high cut slope in Beijing—Zhuhai Expressway with coal geology is calculated with finite element method (FEM) and monitored during excavation. FEM stress and displacement results are in good agreement with in-situ monitoring data，both indicating the trend of deep landslide. Further，potential sliding surfaces are determined by slope internal displacement and sliding rate. The influence of rainfall and excavation on slope displacement is proven immediately by increasing slope deformation rate. Finally，combining FEM computation with monitoring analysis is the main process of dynamic design which guides construction and assures safety.
