Study on Stability Control Technology of Slurry Shield Excavation Face in Silty Clay Stratum
In the process of slurry shield construction in silty clay stratum,it is very important to determine reasonable stability control measures of excavation face for safe tunneling.Taking the shield tunnel of Yu-Ji intercity railway as the background,aiming at the main problems of excavation face stability in silty clay stratum,the comprehensive management measures of excavation face stability are put forward from three aspects:incision pressure,mud index and tunneling management.In the aspect of incision pressure,the upper and lower limits of incision pressure and the control measures of incision pressure are put forward.In terms of mud index,the control standard and construction control measures of mud parameters are given to ensure the film forming quality of excavation face.In the aspect of excavation management,the fluctuation range of incision pressure is reduced by controlling the excavation speed,and the disturbance of excavation to the excavation surface is reduced by combining the mud cake prevention measures.The research has been successfully applied to engineering practice,which can provide reference for similar projects.
slurry shieldsilty claystability of excavation face
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