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坑道掘进中的岩块冒落,是井下作业主要的致伤原因之一。岩块冒落引起的事故,约占事故总数的18％,而其中35％以上是重伤事故。尽管致伤程度有不断下降的趋势,但是岩块冒落引起的事故数量却降得很缓慢。
One of the main causes of the downhole operation is the rock fall in tunneling. Accidents caused by the falling of rock mass account for about 18% of the total number of accidents, of which 35% are serious injuries. Although the degree of injury has been declining, the number of accidents caused by the falling of rocks is slowing down.