为研究岩石切削过程中刀具的力学特性以及刀具平均峰值作用力的预测,基于断裂力学和有限元理论建立了岩石切削的数值模型。模拟分析岩石对刀具的反作用过程,得到不同力学特性岩石和刀具作用条件下刀具所受的反作用力,结果表明,冲击速度在一定范围内对刀具平均峰值作用力影响较小;岩石体积呈阶跃性递减,刀具作用力大小与崩落岩石碎片体积变化一致。对模拟、实验以及已有理论计算得到的刀具平均峰值作用力进行线性回归分析,研究结果表明,数值方法计算结果与实验结果、Goktan[1]理论计算结果的线性相关系数分别为0.812、0.930,相关性较好,表明所建数值模型用于模拟岩石切削是正确和可靠的。 In order to study the mechanical properties of cutting tools and predict the average peak force of cutting tools, a numerical model of rock cutting was established based on fracture mechanics and finite element theory. The reaction process of rock on the tool is simulated and analyzed, and the reaction force of the tool under the different mechanical properties of rock and tool is obtained. The results show that the impact velocity has a little influence on the average peak force of the tool within a certain range; Sex decreases, the size of the tool force and rock fragments of the same volume changes. The linear regression analysis of the average peak force of the tool calculated by simulation, experiment and theoretical calculation shows that the linear correlation coefficients calculated by the numerical method and experimental results and calculated by Goktan [1] are 0.812 and 0.930 respectively, The correlation is good, which shows that the numerical model built is correct and reliable for simulating rock cutting.