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一、西德的经验 目前,鲁尔矿区有23对矿井的平均开采深度为860米,顶板下沉是一个严重问题,一次性使用巷道顶板下沉平均值为36％,复用巷道为46％。巷道卧底费用每年约为1300百万英镑,估算再桃顶费用每米约为1500英镑。 6年前,西德按法国的经验在几个矿进行试验,其中最重要的是莱因兰德联合矿。对于这个试验比较适宜的巷道是选在后退式盘区巷道,它属一次性使用,广泛用于上、下回采巷道,长度为450米,计划用锚杆和金属网支护该巷道的120米。这一长度延伸到煤柱互相作用区,以便得到几种条件下的经验。
First, the experience of West Germany At present, Ruhr mine has 23 pairs of mines average mining depth of 860 meters, the roof sinking is a serious problem, the one-time use of roadway roof sinking average of 36%, 46% . Roadway undercover costs about 1300 million pounds per year, estimated peach top costs about 1,500 pounds per meter. Six years ago, West Germany experimented with several mines based on French experience, the most important of which was the Rainland United Mine. For this test is more suitable for the tunnel is selected in the retractable panel laneway, it is a one-time use, widely used in the upper and lower mining roadway, a length of 450 meters, plans to support the tunnel with bolts and metal 120 meters . This length extends to the coal pillar interaction area in order to get experience under several conditions.