Application of ground directional drilling pre-grouting shield roadway crossing fault fracture zone technology
In order to understand the development of F2 fault and solve the problems of water disaster and fault fracture zone support caused by the breakage of roof,floor and roadway surrounding rock during the rock roadway passing through the fault,based on the analysis of the geological conditions of the mining area,the ground L-shaped multi-branch directional drilling was carried out to pre-grou-ting the broken rock mass around the roadway passing through the F2 fault.The theoretical analysis and research on the plastic zone range of surrounding rock during roadway excavation were carried out by means of theoretical calculation and engineering effect monitoring and analysis.The variation of unit water absorption and grouting effect before and after grouting in F2 fault ground area treatment project are measured and analyzed.The results show that the high-pressure pre-grouting of the ground directional drilling effectively improves the stability of the surrounding rock of the roadway.The re-search results provide practical experience for the safe and efficient excavation of the roadway under similar stratum conditions.
F2 faultfault fracture zonesurrounding rock of roadwaydirectional drillinggrouting rein-forcement
万方数据
维普
