Abstract: Aiming at the poor cutting ability and serious wear of shield cutters when tunneling into soft rock and soil stratum and underground obstacle breakage,a novel Yuanbao ripping cutter is proposed.A novel large-diameter rotary cutting platform and a linear cutting platform were used to study the cutting performance of ripping cutters,and the effects of construction parameters on the force fluctuation and cutting efficiency of ripping cutters were analyzed,especially the effects of installation radius on the force state were investigated.Moreover,the force variations and stability of both rotary and linear cutting tests were analyzed and compared.It is found that the cutting force in two cutting modes increases with increasing cutting depth,the normal and tangential forces does not change with the increasing installation radius,the side force decreases with the increase of the installation radius and decreases significantly when the cutting depth is higher.The specific energy decreases and then increases with the increase of the cutting depth,and the cutting efficiency is the highest at cutting depth of 6mm.In the rotary cutting tests,the triaxial cutting force is smaller at the rotational speed of 1.2r/min,while the cutting speed has no significant effect on the cutting force in the linear cutting tests,and the further analysis found that the cutting force is similar for the same working conditions with the same linear speed.The force fluctuation under rotary cutting condition is larger than that of linear cutting,which leads to large force under rotary cutting condition,and the cutting depth has a significant effect on the force stability.The research results provide data reference for the research and optimization of the cutting performance for the novel shield ripping cutters.