关键词: 盾构隧道, TBM隧道, 双模盾构, 近接施工

Abstract:  A statistical analysis of shield and tunnel boring machine (TBM) tunnels for China’s railways in operation, under construction and planned is performed. By the end of 2025, 81 in-service tunnels (~422 km) had adopted shield or TBM methods, alongside 139 under-construction tunnels totaling 890 km (12.5% of total under-construction length). Geographically, 80% of shield tunnels are distributed across East and South China, while 83% of TBM tunnels are situated in Southwest and Northwest China. Furthermore, the design and construction of shield tunnels under closeproximity conditions are evaluated, proposing control distances and protective measures for alignments intersecting existing infrastructure, such as railways, urban rail transit lines, and highways. Finally, domestic records of shield and TBM tunnels are summarized in terms of length, maximum cover depth, cutterhead diameter, maximum water pressure, and tunneling advance rate.

Key words: shield tunnel, TBM tunnel, dual-mode shield, close-proximity construction