我队所属兰花岭矿区,遇到一种由断层与受断层影响的上下盘围岩破碎而形成的数十公尺的压碎带,主要由石英角砾、灰岩、黑色泥等所组成.岩石碎、脆,软硬不均,且难以绝然分辨机间的软硬程度.使用双管合金钻进遇石英角砾剋取不进;采取双管洗孔钻粒乾钻法,钻泥层不利质量达不到地质设计要求.后在该矿区推广了双管合金、钻粒混合钻进的方 Our team belongs to Lanhualing Mining Area, encountering a crushing zone of tens of meters formed by the crushing of the upper and lower plates of surrounding rock affected by faults and faults. It is mainly composed of quartz breccia, limestone and black mud. Rock fragile, brittle, hard and soft, and difficult to distinguish between the hardness of the machine absolutely hard to use double-tube alloy drilling can not get access to the quartz breccia; to take double pipe cleaning drilling dry drilling method, drilling mud Defective layer of quality does not meet the geological design requirements.After the promotion in the mining area of ​​double-tube alloy, drilling mixed square drilling