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近年来,国内不少金属矿山采用了无底柱分段崩落采矿方法。该采矿法虽具有采矿强度大、效率高、作业安全和便于实现机械化等优点,但由于回采和采准作业大都在独头巷道内进行、产尘强度高、天溜井多以及在三度空间内纵横交错的井巷所形成的复杂角联网路等因素,给通风防尘工作带来了很大的困难。多年来的生产实践表明,采用该种采矿方法的矿山,一般井下粉尘浓度高,污风串联多,而有些矿山在二次爆破后,井下巷道内炮烟弥漫,危害矿工
In recent years, many domestic metal mines have adopted the pillarless subsidence mining method. Although the mining method has the advantages of large mining intensity, high efficiency, safe operation and easy mechanization, the mining and quarrying operations are mostly carried out in single-headed tunnels with high production dust intensity, more skies and well within three degrees of space Factors such as the complicated corner network formed by criss-crossing wellways bring great difficulties to ventilation and dust prevention work. Years of production practice shows that mining using this mining method, the general high concentration of dust underground, in series with more than the wind, and some mines in the second blasting, underground mine smoke filled the tunnel, endanger the miners