Abstract: The rockbreaking performance was studied in the liner cutting test based on different cutting parameters， especially on penetration depth， cutting speed and cutter space. The test results show that the rockbreaking force is increased with the penetration depth and cutting speed. The optimal penetration depth and cutting speed are 76mm and 6m/h in current project. Both the total thrust and torque could be calculated from the maximum linear velocity and rotating speed of cutter head. Attrition crushing was occurred and powder district was formed in the front side of the disc cutter， while the sides will be under the extrusion force and gradually reach the ultimate strength of shear leading to fragmentation.

Key words: penetration depth, cutting speed, spaces, parameters selection, compression and shear analysis