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众所周知,密闭废旧巷道和采空区是矿井防氡的重要内容之一。其作用一是减少矿井的氡析出量,二是减少漏风量。以前者为主的称为防氡密闭,以后者为主的称通风密闭。这两者对气密性要求是不同的。其原因是废旧巷道和采空区被密闭以后,氡浓度将因积累而增高,气密性不高,防氡效果将受到影响。以采空区为例。当有风流穿过采空区进入井下时,采空区出风的氡浓度为
As we all know, closed waste roadway and goaf is one of the important contents of mine radon prevention. Its role is to reduce the amount of radon precipitation mine, the second is to reduce the amount of air leakage. Formerly known as anti-radon closed, the latter is mainly called the air-tightness. These two requirements on airtightness are different. The reason is that after the waste roadway and the goaf are sealed, the radon concentration will increase due to the accumulation and the airtightness is not high, and the anti-radon effect will be affected. Take goaf as an example. When there is wind flow through the goaf into the underground, radon concentration of the gob free air outlet