Foguan Intercity New Shiziyang Tunnel
Release time:
2025-12-24
Abstract
Construction unit: China Railway Tunnel Bureau Group Co., Ltd.
Device Number: ("Lion Ocean" Tunnel Boring Machine) China Railway Equipment
Cutting disc diameter: 13.61 meters
Tunneling length: 4,900 meters
Project Features:
This tunnel was once the world’s largest-diameter underwater railway tunnel. It features a single-bore, double-track design, with a shield tunneling machine advancing alone for a total distance of 4.9 kilometers. During construction, the project encountered maximum water pressures as high as 0.9 megapascals and had to pass through three fractured zones and three sections of high-strength, full-face hard rock. Sections of full-face hard rock accounted for 48.5% of the tunnel’s total length, with the maximum saturated compressive strength of the rock reaching 75.7 megapascals. In response to this complex and composite geological formation, the construction team developed an efficient construction methodology, achieving a record-breaking monthly advance rate of 304 meters. The construction progress in the composite geological sections reached up to 180 meters per month, with an average advancement rate of approximately 126 meters per month—far exceeding typical tunneling speeds under similar complex conditions. As a result, this tunnel has become a truly high-standard, high-risk underwater railway tunnel connecting cities.
Year of commencement: September 2016
Year of completion: December 2019
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