Research on Reinforcement Technology of Shield Tunneling Through City Gate Type Pressureless Tunnel
Taking the shield tunneling through the Biling Tunnel of Dongjiang Water Source in the second phase of Shenzhen Metro Line 16 as the background,the tunnel was built using the New Austrian Tunneling Method in December 2001.It is shut down for maintenance once a year for a period of one month each time,which requires high reinforcement methods and construction period.Based on various conditions such as the location of the shield tunnel crossing,the location of the construction and maintenance port,and the structural characteristics of the tunnel,a reinforcement plan for the tunnel before the shield tunnel crossing is formulated.Technological measures such as pasting steel plates on the inner lining,anchoring with planting bars,backfilling grouting,and anchor rod reinforcement should be taken into consideration in tunnel reinforcement.WSJ cast-in-place building structural adhesive is injected between the lining steel plate and the tunnel lining,and is connected with self-locking anchor rods.The bolts are installed,and the anchor rods are numbered with odd or even numbers in length,arranged in a plum blossom shape.The position of the anchor rods should avoid cracks by no less than 400 mm.Numerical analysis is conducted on the safety of shield tunnel crossing,and the experience in strengthening shield crossing tunnels are summarized,which can provide reference for similar projects in the future.
reinforcement of pressureless tunnelpasting steel plateanchor rodgroutingnumerical analysis
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