Maoba Extra-long Tunnel Gushing Water Analysis And Treatment Of Construction Technology

At present, China is the largest tunnel in the mountain tunnel construction. The construction ofmountain tunnels in the process, the water gushing common for the tunnel construction of geologicaldisasters. Tunnel construction not only reduces the stability of surrounding water gushing, and bring a lotof adverse effects to the construction, especially in a large number of water gushing high-pressure situation,the progress of the construction period, posing a serious threat to the construction.Qinling-Daba Mountain Tunnel located in the hair area dam, tunnel site is extremely complexhydrogeological conditions, especially in large high-pressure water gushing exit of a continuous occurrence,and for the anti-slope construction. Especially after March2008have entered the tunnel around to thecontinuous line of large high-pressure water gushing with, the cumulative occurrence of water gushing overa hundred times, which discharge more than400m3/h of water gushing nearly40times larger, continuouslength of1200meters, water pressure large, the maximum water inflow pressure4MPa, maximum dailydischarge more than30000m3, and the continuous water gushing, gushing water causes complex.From the structural geology and hydrogeology of the tunnel crack Maoba hydrogeological conditionsof the water were analyzed with the situation Maoba tunnel described in detail the type of fracture water,deposit law and with the structure, lithology, etc. relationship. Summary gushing fissure water tunnelgeological prediction methods, and the estimated discharge method, Maoba predict tunnel discharge, andthat the current inflow forecast the main problems. Maoba proposed tunnel will be encountered in theunderground water gushing "to block the main block row with" the principles of treatment, based on theconstruction of geological prediction and advanced processing Grouting and water construction technologydeveloped Chung program.Paper long tunnel through the gushing Maoba prevention methods, summed up the kinds of geologicalconditions for the Integrated Treatment Methods gushing. Focuses on the anti-slope pumping drainagetunnel construction technology, geological prediction technology and advanced small pipe groutingtechnology, analysis of the selection of technical parameters of the principles and methods. Through thisanalysis and argument, similar to the gross large dam construction gushing long tunnel is to be resolved.