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我国煤炭产量95％以上由井工开采。井工开采的特点是作业场所在井下,井巷掘进工程量大。一个年产300万吨的新井初步形成生产能力,投产前,需掘进各种巷道约60公里。投产后,为了维持再生产,在采煤的同时,必须掘进各种必要的巷道。目前,全国生产矿井巷道的总掘进率平均为200米/万吨,如果按年产6亿吨煤计算,则年掘进巷道达12000公里,新井建设需要掘进各类巷道约1000公里,所以全国煤矿巷道年掘进总长度将达13000公里之多。井巷掘进工程量大,也就决定了巷道支护工作量之大。 巷道支护目的,是防止围岩掉落,在一定程度上控制围岩变形和应力重新分布。在
Over 95% of China’s coal production is mined by the well. Wells mining is characterized by the workplace in the mine, tunneling large amount of engineering. An annual output of 3 million tons of new wells initially formed production capacity, put into operation before the need to drive all kinds of roadway about 60 km. After putting into production, in order to maintain the reproduction, all the necessary roadways must be excavated at the same time of mining. At present, the average digging rate of mine production in China is 200m / ten thousand tons on average. If the annual output of 600 million tons of coal is calculated, the annual number of tunnels will reach 12,000 kilometers. The construction of new wells will require about 1,000 kilometers of tunnels for tunneling. Therefore, The total length of roadway tunneling will reach more than 13,000 kilometers. Well tunnel excavation project is large, it also decided the large amount of roadway support work. The purpose of roadway support is to prevent the surrounding rocks from dropping, to a certain extent to control the deformation and stress redistribution of the surrounding rock. in