反井鉆(zhan)機施(shi)工(gong)排渣原理：

被(bei)破(po)碎的巖屑在導孔(kong)(kong)(kong)鉆(zhan)(zhan)進時被(bei)正循環的洗井(jing)液沖(chong)洗，巖屑沿著鉆(zhan)(zhan)桿與孔(kong)(kong)(kong)壁間(jian)的環形(xing)空(kong)間(jian)由洗井(jing)液提升到(dao)鉆(zhan)(zhan)孔(kong)(kong)(kong)外。在擴孔(kong)(kong)(kong)時將導孔(kong)(kong)(kong)鉆(zhan)(zhan)頭卸下，安裝反擴滾刀，巖屑靠自重直接落到(dao)下水平巷道內(nei)，采用裝載機和(he)運輸設備及時清(qing)理運出。