Since the method causes serious depletion of ore during mining of upper plate,the inclined cutting raise heading together with inclined medium or deep hole kerve is suggested.

以无底柱为代表的崩落法中,切割拉槽至关重要,而目前无底柱大多用垂直切割天井与切割平以中深孔联合拉槽的切割方法,但该方法在对体上盘回过程中损失贫化较大。