Study on the strength characteristics of different block stone filling material

Using RMT-150C hydraulic servo control system to carry out the single axial compression test of the cement filling body with different block stone.The compressive strength of the block was 3.800 MPa、4.090 MPa、2.729 MPa、3.333 MPa respectively, when the mass fraction of the block is 0%、30%、40%、50%. The change law of the compressive strength value first increase and then reduce and increased again with the increase of the content of the block stone. The value of strain which stress corresponded of peak value the stress-strain curve of the four groups was analyzed. The strain value of the block was 0.006、0.0075、0.010、0.0125 when the mass fraction of the block is 0%、30%、40%、50%. The increase of the rock block can effectively improve the deformation capacity of the filling body, but it can reduce the bearing capacity of the filling body to a certain extent.