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二次掘送巷道的支护技术关键是对破碎松动围岩加固补强,如在围岩剧烈活动期,在高地压尚未重新分布完毕之前进行,则支护效果不佳,一般支护方法很难使巷道支护完好;如支护时间滞后,待变形严重后再进行加固支护,巷道的有害变形将会加剧,巷道冒顶的机率增加,围岩破碎松动的范围将加大,给二次掘送工作带来困难,不仅增加成本,安全性也没保证。
The key technology of secondary tunneling is to strengthen and reinforce the broken and loose surrounding rock. For example, during the period of vigorous activities of surrounding rocks, the support effect is not good until the high pressure has not been redistributed. The general supporting method is very difficult It is difficult to make the roadway support intact; if the supporting time lags behind, after the deformation is serious, it will be reinforced and supported again, the harmful deformation of the roadway will be aggravated, the probability of roadway roof fall will increase, the range of rock breakage will increase, Dredging work to bring difficulties, not only increase costs, safety did not guarantee.