一、概述露天矿山深孔或硐室爆破后的不合格大块,必须予以二次破碎。我国传统的浅眼爆破法,主要缺点是飞石距离远、劳动强度大、粉尘危害严重。新建、扩建矿山征购土地及民房搬迁均按400米的安全距离划定,不仅增加了巨额投资,而且占用大量农田,对工农业生产都 First, an overview of open pit deep hole or chamber blast after unqualified chunk, must be second crushed. The traditional method of shallow-hole blasting in our country is that the main disadvantage is the distance between flying stones, the labor intensity and the serious damage of dust. New and expanded mining land acquisition and demolition of houses are classified according to the safety distance of 400 meters, which not only adds huge investment, but also occupies a large amount of farmland,