Abstract: In order to better study the interaction mechanism of ore-bearing rock and filling body,according to the supporting effect of roof and ore-bearing rock in different hardening periods of the filling body,the filling body is divided into the elastic deformation in small deformation stage and plastic deformation in large deformation stage.The corresponding mechanical model of cantilever beam + uniform load and related restraints of the interaction of the filling body and the surrounding rock is established.At the same time,the standard cylinder is made based on the ratio,cutting and grinding are conducted after the stability of the filling body strength,the semi-round cake with the thickness of 20 mm is hollowed out in the middle of standard cylinder,and it is filled with the materials with the water and sand ratio of 1∶12.Through the strain gauge,the variation regularities of stress and strain of the contact zone is analyzed by testing the internal and surface wall strain under the loading,besides that,the relevant process is simulated and relevant test results are verified by using numerical simulation software.Simulation results show that with loading,the stain variation increasing amplitude is big,under the condition of no confining pressure,with the action of axial loading,the spalling phenomenon of filling body caused from temporary surface.The safety coefficient in contact zone is increased under the constraint of confining pressure,the local area is transformed from plastic failure zone to stable zone.

Key words: Cemented filling, Ore-bearing rock, Contact zone, Supporting effect