Dalian Metro Line 5: Subway Tunnel Between Railway Station and Suoyuwan South Station
Release time:
2025-12-24
Abstract
Construction unit: China Railway First Bureau Group Co., Ltd.
Device Number: (Haihong No. 1 Tunnel Boring Machine) China Railway Equipment
Cutting disc diameter: 12.26 meters
Tunneling length: 2882 meters
Project Features:
This project represents the world’s first large-diameter shield tunnel constructed in karst geology beneath the sea. The tunnel must traverse a 1,538-meter-long section characterized by highly developed karst features, where thousands of cavities of varying sizes are distributed, with the largest cavity reaching a height of 29.8 meters. At the same time, the tunnel must also contend with hard rock formations whose maximum compressive strength reaches 118 megapascals. Moreover, the tunnel faces a maximum hydrostatic head pressure of 0.5 megapascal—a high-pressure environment that poses significant challenges to the tunnel’s sealing and structural integrity. During shield tunneling, the tunnel will pass under several critical infrastructure facilities, including the Shugang Railway, Heizui Port, and Xianglu Reef Navigation Channel. The surrounding area is further complicated by the presence of weathered zones and fault zones. It is essential not only to avoid any adverse impacts on these facilities during construction but also to address the difficulties in maintaining precise tunnel alignment caused by the uneven distribution of soft and hard geological strata.
Year of commencement: January 2019
Year of completion: January 2021
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