为研究截齿破岩过程中的截割力，裂纹生成和碎片分离过程，进一步提高巷岩掘进效率，采用SolidWorks软件建立了截齿截割岩石三维模型，并运用动力学仿真软件ANSYS/LS-DYNA建立了不同截割角、不同切削厚度下基于侵彻失效和压缩损伤的截齿破岩三维有限元模型，采用Holmquist-Johnson-Cook(HJC) 本构模型来模拟岩石材料，并通过添加非反射边界条件以模拟岩块的无限大。对截割速度为3 m/s，切削厚度为10、15、20 mm，截割角分别为35°、40°、45°、50°、55°和60°参数下的截割力大小、截割力波动规律、裂纹扩展、碎片分离进行了研究，分析了岩块大小和截割力之间的关系。结果表明：采用ANSYS/LS-DYNA（3D），利用侵彻失效和压缩损伤相结合的方法，对于模拟截齿破岩过程中的裂纹扩展和碎片分离能够获得良好的效果；截齿以不同截割角及切削厚度截割岩石，获得的最大峰值截割力及截割力均值均不相同，裂纹的生成、扩展及碎片的大小也不相同；随着截割角的增大，破碎产生的块岩数先增大后减小，截齿截割力均值先减小后增大，其中截割角为50°时，块岩数目最多，截割力均值最小，截割过程中截割力波动最小，为提高破岩效率，减小截齿的磨损进而提高截齿寿命，截割角取50°为宜；随着切削厚度的增加，块岩数也增加。研究结果为提高破岩效率和截齿寿命及截割角和切削厚度的选择提供了理论依据。

In order to study the cutting force,crack formation and debris separation process of the pick in the process of rock breaking,and further improve the efficiency of roadway excavation,the three-dimensional model of rock cutting by pick is established by SolidWorks software,and the three-dimensional finite element model of rock breaking by pick based on penetration failure and compression damage under different cutting angles and Cutting thicknesss is established by using dynamic simulation software ANSYS / LS-DYNA,the Holmquist Johnson cook(HJC) constitutive model is used to simulate rock material,and the infinite size of rock block is simulated by adding non reflective boundary conditions. The cutting force,the fluctuation law of cutting force,crack propagation and debris separation under the cutting speed of 3 m/s,the Cutting thickness of 10,15 and 20 mm,and the cutting angles of 35°,40°,45°,50°,55° and 60° are studied. The relationship between the size of rock block and the cutting force is analyzed. The results show that：using ANSYS / LS-DYNA(3D),using the method of penetration failure and compression damage,good results can be obtained for simulating the crack propagation and debris separation in the process of rock breaking;the maximum peak cutting force and the mean value of cutting force are different when the pick cuts rock at different cutting angles and depths,and the generation,propagation and fragment size of cracks are also different;with the increase of cutting angle,the number of rock blocks produced by crushing increases first and then decreases,and the cutting〖LM〗force of pick decreases at first and then increases. When the cutting angle is 50°,the number of rock blocks is the most,the cutting force is the smallest,and the cutting force fluctuation is the smallest. In order to improve the rock breaking efficiency,reduce the wear of the pick and then increase the pick life,the cutting angle of 50 ° is appropriate;with the increase of Cutting thickness,the number of blocks also increases. The research results provide a theoretical basis for improving the rock breaking efficiency,the life of the pick and the selection of cutting angle and Cutting thickness.