China Railway Tunnel Bureau Completes East Line of Taizhou Jiefang Road River-Crossing Tunnel

en.Wedoany.com Reported - Recently, the east line tunnel of the Taizhou Jiefang Road River-Crossing Tunnel and Southern Connection Project (Phase I), the first large-diameter shield-driven river-crossing tunnel in Taizhou City, Zhejiang Province, China, constructed by China Railway Tunnel Bureau, was successfully completed. This project is a core component of Taizhou's backbone road network, aimed at improving the urban traffic layout and promoting regional connectivity across the river. The route starts south of the intersection of Jiaojiang Zhang'an Avenue and Darui Road, extends southward along Darui Road, crosses under the Jiaojiang River via a tunnel, and then runs along Jiefang Road, with a total length of 4,220 meters. The river-crossing shield-driven section consists of east and west lines. The east line tunnel, which was completed this time, is 1,806 meters long and was excavated using the "Hehe" super-large-diameter slurry balance shield machine with a diameter of 15.01 meters.

The tunnel construction section primarily passes through strata of silt, silty clay, and silty clay interbedded with fine sand, characterized by six major features: high water content, high compressibility, high rheology, low strength, water-rich confined conditions, and shallow overburden. These conditions pose risks such as difficulty in controlling shield attitude, segment floating, voids behind segments, and tunnel leakage during construction. To address the challenges of soft soil and high water pressure, the project team established a full-process safety and quality control system, strictly implemented standardized construction management requirements, and adopted techniques such as "three-ring re-tightening" of segment bolts and secondary grouting. The synchronous mortar mix ratio was dynamically optimized based on real-time changes in ground conditions. These measures effectively enhanced the waterproofing and sealing performance of the tunnel, resolved issues such as segment floating, and ensured the stability and reliability of the tunnel's structural integrity.

To solve a series of challenges in river-crossing shield tunneling, the project applied an intelligent construction system for shield tunnels independently developed by China Railway Tunnel Bureau. This system is equipped with a dedicated intelligent construction management platform, leveraging intelligent sensing and big data monitoring systems to collect and analyze shield tunneling data in real time, precisely control the tunneling attitude, minimize ground disturbance, and ensure safe and controllable construction throughout the process. Additionally, the project introduced intelligent equipment such as an intelligent box culvert erector to replace traditional manual construction methods, significantly improving tunneling precision and construction efficiency, achieving standardized, intelligent, and efficient shield tunneling operations.