Key Construction Technology of Large-diameter Slurry Balance Shield Underwater Crossing Fractured Zone Stratum
During the construction of the Pearl River Estuary Tunnel,the large-diameter slurry balance shield crosses through the fractured zone under water,and the construction risk is high and difficult.In view of the problems of stagnation,mud cake and serious tool wear in the process of slurry balance shield tunnelling,this paper analyzes the causes and gives the pre-control measures to study the key construction technology.When the shield tunnelling in the stratum of underwater fault fracture zone,it is necessary to strictly control the tunnelling parameters,especially the pressure of mud sump,and control the rotation speed and penetration of cutterhead.Combined with the stability of the excavation surface,the slag discharge in the warehouse and the fluid transport state,the mud parameters are adjusted in time.By using crushing,scouring and other devices,the risk of stagnation in the warehouse is avoided.By configuring the intelligent real-time monitoring system of tool condition,the abnormal tool can be replaced in time.A reasonable shield tail sealing device should be set to ensure that the shield sealing performance meets the requirements.
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