Research On Blind Heading Construction Technology Of Super High-pressured Water And Reverse Slope Bursting Extra-long Tunnel

In this paper, JinPing II Hydropower Station auxiliary guide3#tunnelconstruction in the process of actual success experience and the dummy in the drillingand blasting excavation construction, waterproof and drainage, ventilation, preventionand control of rock burst, the key technology of surrounding rock stability of fiveaspects are analyzed, the research and summary, made the following findings:(1)The purpose of combining secondary lead#3adit construction andengineering field of construction equipment and other conditions, chosen as the drilland blast tunneling method of tunnel construction, the successful completion of theconstruction of the tunnel.(2) For large and complex projects caverns underground JinPing hydropowerconstruction, ventilation scientific theory as the basis, based on data collected at thescene by calculating develop a combination of both practical and economicalventilation solution.(3) According to the auxiliary hole to expose the karst hydrogeologicalconditions in the excavation by drilling geophysical method of combining thesuccessful prediction of the construction process of gushing water, and a targetedtreatment measures.(4) For the JinPing great depth, extremely hard rock characteristics, utilizationof sprayed concrete, rock reinforcement rods, steel anchor combined support bracingspray, spray water jet, improving construction methods, stress relief method andadditional temporary protection methods passed the strong rock burst area, to achieve a safe, fast and strong rock burst tunnel construction tunnel section.Application of the above work site JinPing underground tunnel group to solvethe engineering problems of construction, safety, rapid completion of the constructionof the tunnel, and achieved good results.