截割厚度与截线距对镐型截齿破岩力学参数的影响

基于对一种砂岩的直线截割试验,研究截割厚度和截线距对镐型截齿破岩力学参数的影响。单因素回归表明:截割力、法向力与截割厚度成正比,线性拟合和幂函数拟合均能很好地描述它们之间的统计学关系;随着截割厚度的增加,法向力截割力比值呈线性减小;随着截线距的增加,截割力和法向力呈线性增加,法向力截割力比值呈幂函数减小。载荷波动性系数随着截线距与截割厚度比值的增大呈线性减小。多元线性回归表明:截割力、法向力与截割厚度和截线距之间有极强的统计学关系;载荷波动性系数与截割厚度及截线距之间存在显著的统计学关系,且与截割厚度成正比,与截线距成反比。对比发现,Evans的理论模型较Roxborouth等、Goktan的改进模型对截割力有更好的预测性能。

Effects of cut depth and cut spacing on tool forces acting on a conical pick in rock cutting

Effects of cut depth and cut spacing on tool forces acting on a conical pick were investigated based on rock cutting tests conducted on a sandstone using a linear rock cutting machine. Single factor regression showed that linear fitting and power function one can all be used to statistically describe the relation among cutting force, normal force and cut depth; cutting force and normal one increase with increase in cut depth, the ratio of normal force to cutting one linearly decreases with increase in cut depth; cutting force and normal one linearly increase with increase in cut spacing, the ratio of normal force to cutting one deceases with a power function form; load fluctuation coefficients linearly decrease with increase in the ratio of cut spacing to cut depth. Multi-factor linear regression showed that there are extremely strong statistical relationships among cutting force, normal force and cut depth, cut spacing; there are significant statistical relationships among load fluctuation coefficients and cut depth, cut spacing; meanwhile, load fluctuation coefficients are   proportional to cut depth, and inversely proportional to cut spacing. Performance comparison indicated that the theoretical model of Evans has a better performance to predict cutting force values than the model of Roxborough and Liu, and the model of Goktan do.