当前在火成岩和变质岩(即硬岩)中采用机械方法掘进的巷道比以往任何时候都要多,这一趋势还会一直延续下去。目前制造的全断面岩巷掘进机与过去的比较,一般说来,都具有较大的推力与扭矩,能装备最大的滚刀与刀圈。最近的实践证明,在硬岩掘进中,使用掘进机是有效的和经济的,在多种岩石中(最坚硬的岩石除外)能够取得满意的掘进速度。如果对现在有掏槽式切割的方式加以适当改变,则掘进费用及掘进速度还可以进一步得到改善。 The current mechanized tunneling of igneous and metamorphic rocks (ie, hard rock) is more than ever before and the trend will continue. The current full-face rock tunnel boring machine manufactured in comparison with the past, in general, have greater thrust and torque, can be equipped with the largest hob and knife ring. Recent practice has proved that the use of roadheaders is effective and economical in hard rock tunneling and satisfactory tunneling speeds can be achieved in a wide range of rock types, with the exception of the hardest rock. If the current method of notched cutting is properly changed, the driving cost and the speed of driving can be further improved.