Research on Replacement Technology of Shield Tail Brush in Water-rich Weak Stratum
Shield tail brush is a key facility to prevent water,mud and sand from pouring into the interior of the shield.In the process of long-distance tunneling,the shield tail brush will gradually wear away.Once it fails,it will induce risks such as shield tail slurry leakage,ground subsidence and cracking,and even cause engineering accidents such as shield machine flooding and tunnel damage.Based on the case of shield tail brush replacement in a certain section,this paper introduces in detail the whole process of shield tail brush replacement construction in the process of shield tunneling from the perspectives of engineering overview,geology and hydrology,risk prevention and control,reinforcement and water stop,installation and demolition implementation,and shield re-pushing.The rationality and reliability of the procedures and measures adopted in this paper are verified,which can provide reference for the replacement of shield tail brush in the fourth round of Suzhou rail transit network tunnel construction in the future.
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