English：

During the construction of the Pearl River Estuary Tunnel, the large⁃diameter slurry balanceshield crosses through the fractured zone under water, and the construction risk is high and difficult. Inview of the problems of stagnation, mud cake and serious tool wear in the process of slurry balance shieldtunnelling, this paper analyzes the causes and gives the pre⁃control measures to study the key constructiontechnology. When the shield tunnelling in the stratum of underwater fault fracture zone, it is necessary tostrictly control the tunnelling parameters, especially the pressure of mud sump, and control the rotationspeed and penetration of cutterhead. Combined with the stability of the excavation surface, the slagdischarge in the warehouse and the fluid transport state, the mud parameters are adjusted in time. Byusing crushing, scouring and other devices, the risk of stagnation in the warehouse is avoided. Byconfiguring the intelligent real⁃time monitoring system of tool condition, the abnormal tool can be replacedin time. A reasonable shield tail sealing device should be set to ensure that the shield sealing performancemeets the requirements.