Rock bolt foundation is a type of bolt foundation that fine aggregate concrete and bolt are poured into the rockhole.
岩石锚杆基础是以细石混凝土和锚杆灌注于钻凿成型的岩孔内的锚杆基础。
2
Applying long horizontal roof rockhole to drain the gas from adjacent seam and goaf is a new technique. In this paper, introduces the latest progress of this technique is introduced fully.
采用顶板岩层水平长钻孔抽放邻近层和采空区瓦斯是一项新技术，全面介绍了该技术研究的最新进展。
3
Slabs of rock had slipped sideways in the remote past and formed this hole.