对绢云母石片岩掘进中一种地质工程现象的认识

Knowledge of a Geological Engineering Phenomenon in the Drilling of Sericite Quartz-Schist

在绢云母石英片岩中开挖隧洞,使用多臂钻造孔爆破,出现钻孔有规律的弯曲现象,影响了钻爆速度和成洞质量。通过总结规律性认识,初步揭示形成机制,提出了相应的解决方法。

When we dig a tunnel in sericite quartz-schist with dobby drills,regular bending of the boreholes appears,which affects drilling speed and the borehole quality .By summarizing regularity,the formation mechanism is revealed and appropriate solution are proposed.