EARLY RECOGNITION AND MECHANISM OF CREEP-BUCKLING OF BEDDING SLOPE

This paper analyzes the mechanism of buckling failure(slipping-bending) of the bedding slope. It uses physical mechanism model, numerical simulation and theoretical analysis. It presents the forming geological and mechanical conditions, the critical failure state discrimination and early identification marks of buckling failure. It finds that the rock stratum dip angle greater than 20is a very important geological conditions for the formation of slipping-bending. The curved uplift in the leading edge of the slope is an early sign before buckling failure. The dip angle of rock slope, the single layer thickness, the critical slope length and the depth of the buckling interact each other. The larger the rock dip angle, the more prone to produce the slipping and bending, and the more the number of layer and depth of buckling. There is a change law of negative power function between the critical slope length and the rock stratum dip angle. The flexural rigidity of bending layer and the buckling depth of bedding slope are influenced by the co-bending effect produced by the interlayer bonding. The co-bending effect plays a key role on the ultimate buckling of the bedding slope. The results have an important value for early prevention and recognition of geological hazard.