Abstract: To study the variation characteristics of the high cut slope stability after the excavation of an expressway, this paper presents the strength reduction method (SRM) in the numerical analysis using Midas GTS finite element software. The factor of safety for the global stability, deformation and potential sliding plane are determined under the unsupported and heavy precipitation conditions. The appropriate support remediation measures were provided based on the analytical results. Two different remediation methods are studied in the paper: one method was providing more ground anchors grids only and the other approach was the combination of increasing the number of ground anchors and widen the platform on the slope. The results indicate that, only widening the platform on the slope has limited slope stability increase. The combination of ground anchor grid and the widening of the platform can effectively improve the global stability of the cut slope, control the deformation and manage the construction risks.

Key words: High Slope, Midas/GTS, Stability Analysis, Ground Anchor with Grid Beam, Factor of Safety