Abstract: In order to solve the problems of poor performance of anti-slide caisson in the mitigation of potential landslide in the unconsolidated overburden soils, a post grouted circular anti-slide caisson structure is proposed to improve the performance of the traditional circular anti-slide caisson structure. The caisson structure is mainly composed of steel casing, grouting pipe, circular anti-slide caisson longitudinal reinforcement and circular stirrup. The post grouted caisson is a caisson-soil compound structure. The sliding force is carried by the anti-slide caisson and the adjacent grouted soils, which has the advantages of minimizing the borehole collapsing, improving anti-slide performance and stabilizing the geomaterial among caissons. The design approach of the post grouted circular anti-sliding caisson is also proposed in the paper. The engineering application shows that the post grouted circular anti-slide caisson can effectively reduce the lateral earth pressures of the caisson, lower the location of the maximum lateral earth pressures and improve the stiffness of overburden soils. 

Key words: unconsolidated overburden soil layer, landslide, circular anti-slide caisson, lateral earth pressures, foundation stiffness