With considering the friction between a micropile and the surrounding soil mass

a new design calculation model of single anti-slide micropile is developed; and a detailed calculation algorithm is presented. Based on the deformation characteristics of micropile in reinforcing a slope

the interaction mechanism between the micropile and the surrounding soil mass is analyzed

and the friction between the micropile and the soil mass is introduced into the force analysis of single anti-slide micropile. According to the different loading distributions along different parts of the micropile

the micropile is divided into three parts along its length

namely

the friction part

the landslide thrust part and the anchoring part. The governing equations for the deformation of different sections of the micropile are derived. The governing equations are solved by using the initial parameter method

and the internal force distribution and deformation characteristics are determined. The calculated results show that

under the action of a landslide thrust

the deformation of micropile mainly occurs near the sliding surface and the upper parts of the pile. The internal force and bending deformations near the sliding surface are larger than those at the other parts of the micropile. Along the friction part of the micropile

the bending deformation is small

and the relatively small bending deformation leads to nearly horizontal movement of the micropile. The friction is an important part of the interaction between micropiles and the surrounding soil mass

and it can significantly reduce the bending deformation of the micropile

so that the landslide displacement can be effectively controlled.