Abstract: The finite element model of H shaped antilandslide caissons with circular and rectangular sections were respectively established using the project information of Pucheng Expressway. The soilcaisson interaction effect are analyzed and the sliding band was simulated using strength reduction method. The two different section caissons are numerically compared. The results indicate that, under the same section area and embedment depth, circular caisson have a better performance over that of caissons with rectangular sections. Therefore, less reinforcement bars can be used in the circular caisson. The H shaped caisson can transfer the thrust at the rare caisson to the front one through the soil in between the caissons, in addition to the load transfer through the connecting beam. However, this soilstructure interaction effect was not considered in the simplified design. The results also indicate that the antilandslide caissons have no significant advantage by using the high strength concrete. The thickness of the connection beam cannot to be too thick and the optimum section 〖JP2〗height is between 0.5 and 1.0 caisson diameter.

Key words: Landslide, H Shaped AntiLandslide Caissons, Three Dimensional Numerical Analysis, Displacement, Internal Force