为了降低生产剥离系数并把一部分剥离费用移到后期,必须把工作帮角度变陡。而改变台阶高度、工作平台宽度、分期开采和用组合台阶开采以及其它方法,都可加大工作帮角度。但是最实际的方法是分期开采和组合台阶开采两种。 In order to reduce the production of the stripping factor and to move part of the stripping costs to a later stage, the angle at which the work is to be done has to be steep. However, changing the height of the steps, the width of the work platform, the phased mining and the combined step mining and other methods can increase the work help angle. However, the most practical method is to stage mining and combine two steps.