As shield tunnels reach their service time,they will be exposed to a variety of structural problems,so it is particularly important to strengthen and manage the tunnels after they have been put into service.Based on the project between Fuxingmen and Xidan Station of Beijing Metro Line 1,this work proposes a new type of prefabricated rein-forcement structure including a composite cavity reinforcement structure and a prefabricated assembly structure to ad-dress the structural diseases of shield tunnels.Using numerical simulation methods,the mechanical properties of the composite cavity reinforced structure under different installation methods were systematically analyzed.Research results show that the pure epoxy resin adhesive bonding method performs well in terms of initial load-bearing capacity,but the damage in the ultimate state is mainly concentrated near the arch foot;the pure anchor bolt bonding method slightly im-proves the ultimate load-bearing capacity,but the overall stiffness.However,the glue bolt hybrid bonding method combines the advantages of both.It not only provides a stable reinforcement effect before the epoxy resin glue fails,but also the anchor bolts continue to play a shearing role after the epoxy resin glue fails,significantly improving the tunnel's stability.The ultimate bearing capacity and overall stability are greatly increased to 200.4％ of the design soil pres-sure;the interface shear stress is not affected by the bonding method and is concentrated near the arch foot.
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