BENDING YIELDING AND TENSILE CRACKING CRITERA FOR FAILURE OF ROCK SLOPE WHOSE DIP DIRECTION OPPOSITE TO THE DIP DIRECTION OF STRATA

There have been two mechanical models for the failure criteria of bending deformation in the rock slope with dip direction opposite to the dip direction of the rock strata.The models are developed using the elastic buckling model of averticam compressive bar and the bending cracking model of a horizontal beam.Whereas,some important factors,such as the additional bending moment induced by the deflection and the slipping resistance on the interface of rock layers are not considered.In this paper,based on the mechanical analyses of the anti-dip rock layers,a model of the slanting elastic cantilever beam with fixed bottom and freeuop boundary and equal thickness is established,in which the slipping resistance on beams side face is taken into account.Rayleigh-Ritz energy method was introduced to develope the critical conditions of the elastic buckling of the beam and the bending fracture of the fixed bottom.The application in real case analyses and the discussions afterwards indicate that the elastic buckling model is applicable in very steep rock stratum,and that the bending fracture is the deforming and failure mechanism of median steep to steep anti-dip layered slope.Furthermore,the critical conditions of bending fracture is significantly influenced by the mechanical properties of the interface between layers.