The shaft friction value is still in the linear growth phase. The self-balanced method may resolve the problem that the shaft friction is not ful used in Guizhou Province.

The stability of transverse vibration in high speed automobile and the influence of torsional vibration, friction, damping and movement of spline shaft on vibration are discussed.

The single pile is simplified to elastic shaft elements suffering skin friction and the soil mass is considered to be homogeneous isotropic elastic semi space.