An Experimental Study on Destructive Nature of Seam Roof Strata with Horizontal Bedding

Subjected to external forces, the structure surface between rocks (ie, bedding planes) should be deformed under external force. If the two side walls of the rock bedding plane has perfectly flat smooth surface, after the composite layered rock subjected to force, bedding plane can be closed as surface contact manner. However, the rock bedding plane side walls generally showed local contact state in the nature, the rock layers of bedding planes will produce compressive deformation under stress. Through complete stress - strain triaxial loading experimental study on the effects of the presence of horizontal bedding on layered composite rock strength and deformation, and the elastic deformation of layered rocks are calculated using elastic mechanics, the result shows that due to the presence of irregular bedding plane, the presence of horizontal bedding formation will reduce the overall strength, and increase the overall rock deformation.