The pile foundation in high-steep rock slope has double functions

i.e.

transferring loads from superstructure and bearing landslide thrust

and the mechanical behavior is very complex. In order to reduce the adverse effect of the pile friction to the slope stability

a steel casing coating pile (SCCP) is proposed

in which the isolation steel casing is set outside of the pile

and the inner of steel casing is coated by the asphalt. Based on the push-out test

the lateral friction distribution rule of pile and the isolation resistance-reducing effect of the asphalt coating are studied. The experimental results indicate that the shear stress of the concrete without asphalt coating is large at both ends and small in the middle

and the asphalt coating can effectively reduce the lateral friction of the pile

change the bonding mechanism between steel and concrete

and make upper loads transferred to deep rock mass. Based on numerical analysis

it is shown that the steel casing coating pile can reduce the upper friction of pile

and transfer the load to deep rock mass

and lessen the adverse effect of the pile lateral friction above the slope sliding surface to the stability of the high-steep slope.