Research on Front-mounted Adcanced Grouting Water-stop Technology of Double Shield TBM Crossing High-pressure Water-rich Hard Rock Tunnel
The double-shield tunnel boring machine(TBM)construction of the Jinzhong Yellow River Water Diversion Tunnel crosses high-pressure and water-rich fractures,and the high-pressure and large-flow water inrush on the tunnel face is serious.The conventional rear-loaded pre-grouting technology was used to cope with the water inrush on the tunnel face but proved to be ineffective.The main reason is that due to the influence of the external angle,conventional rear-loaded pre-grouting has such problems as limited grouting target area,low drilling efficiency,difficulty in pre-grouting control,it is difficult to form an effective waterproof curtain structure.Through systematic study and analysis of the hydrogeological conditions,water inrush and pre-grouting technology of the tunnel,the double shield TBM front-loaded pre-grouting technology for water sealing is proposed.By optimizing the grouting equipment,the pre-grouting water sealing was implemented at the working face.The field grouting test was carried out to study the drilling construction,grouting materials,grouting parameter control and grouting section length optimization of hard rock surfaces.According to the field test information,the grouting equipment and technology were continuously optimized.Through the application of the pre-grouting water sealing technology in the Jinzhong Yellow River Diversion Tunnel,the average water yield in the tunnel is reduced to 3 702m3/d,a decrease of 75.9%,and the TBM construction efficiency is improved to a certain extent.And engineering practice has proven that this technical method is effective.
underground engineeringdiversion tunnelhard rock grounddouble shield tunnel boring machinewater inrushgrouting
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