\nT/UNP 709-2025 Highway Tunnel Engineering Design Specifications

Scope

Main technical content: This standard applies to the design of mountainous highway tunnels at all levels, and stipulates the general requirements, the design of tunnel portals and entrance structures, the design of exposed sections, the design of tunnel linings, the design of waterproofing and drainage systems in tunnels, and the design of roadbeds and pavements in tunnels. The general requirements cover design standards, linear design, and the selection of setting forms; the design of tunnel portals and entrance structures involves location selection, structural forms, and ancillary facilities; the design of exposed sections specifies the structure type and construction requirements; the design of linings stipulates the selection of types and structural details; the design of waterproofing and drainage systems emphasizes the combination of prevention and drainage and the configuration of facilities; and the design of roadbeds and pavements considers strength, drainage, and pavement types. It also clarifies the definitions of terms and normative reference documents, providing comprehensive and systematic guidance for the design of highway tunnel projects.

Development Information

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