Research and Application of the Shield Method for Water Conveyance Tunnel Extension and Initial Sealing Ring Technology
For large-diameter tunnels,among various non-excavation construction technologies,the shield method has gradually become the mainstream.The commencement of shield tunneling is of paramount importance in the entire shield construction process.To ensure the safety of shield tunneling commencement,a common approach is to reinforce the strata in front of the shield before commencement,and to initiate the shield tunneling process after meeting the design requirements.However,during the commencement of shield tunneling,there are often issues such as insufficient reinforcement at the tunnel face,excessive groundwater,and high surrounding risks.To overcome these problems,this paper introduces an extension and initial sealing ring technology,which can effectively eliminate construction risks during the shield tunneling commencement process.This technology can serve as a reference for similar new and ongoing projects.
water conveyance tunnelshield tunneling commencementextension and initial sealing ring
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