Abstract: A typical cut slope stabilized by antislide caisson in Guizhou was analyzed by both the code method and the finite element methods for the factor of safety of the slope. The numerical analysis results indicate that, when the cut slope is stabilized by the caisson and the retaining wall, the potential sliding plane is first developed in soil zone. With the increase of strength reduction, the deformation at the top of slope increases, and a circular sliding surface can be observed. When the factory of safety of the improved slope is between 1.1 and 1.2, the improved slope is stable and the deflection in the caisson is small and meets the code requirements. When the effective length of the anti-slide caisson is 29 meters, the anchoring depth is 19 meters. When the caisson length is 19 meters with anchoring depth is 7 meters, rotational tilting of the caisson is observed so that the ground anchor should be used in the caisson system.

Key words: stability analysis, antislide caisson, anchorage depth, spacing of caissons