Abstract：Landslide with plane rotation under lockup of centric segment is formed in the course of progressive failure of layered rocks on the oblique bank slope. It is characterized that there exists a relative locked segment on bedding plane around the center of a landslide body with bigger shear strength and torsion sliding impeded，whereas the movement of slope increases gradually from the center to the outer segment in which the layered rock mass spins around a hinge located in the center on potential bedding plane. The reason why landslide exhibits plane rotating is that resultant of forces acting on the landslide body does not traverse its center of gravity，which results in a moment of rotation. So the deformation and failure mode of landslide can be described by rotation of a circled rock slab with inner fixed part under combined loading of gravity，friction forces on potential bedding plane，shear strength in centric part，and resistance to rotating on boundary. By means of elasticity theory，the rotation stress field of the circled layered rocks is deduced. Furthermore，the triggering condition of rotating glide is studied and onset mechanism and stability criterion of landslide are established with the approach of limit equilibrium. The study result is proved to be effective in the quantitative evaluation of stability of this kind of landslide.
