【摘要】 讨论了国内外大直径硬岩的钻进技术方法,介绍了国内外正在应用和研究的大直径硬岩钻进的新技术;指出了大直径硬岩反循环潜孔锤环状钻进取芯方法的优点;提出了大直径硬岩取芯钻进中存在和需解决的问题;指出了大直径硬岩取芯钻进技术的发展研究方向。更多还原

【Abstract】 With introduction of technique used in large diameter hard rock drilling at home and abroad,advantages and urgent problems of reverse circulation down hollow hammer coring technique were put forward in this paper.Future methods of development and research of large diameter drilling in hard rock are proposed.更多还原