China Railway First Group Completes Right-Line Breakthrough of Cao'e River Crossing Tunnel on Phase II of Shaoxing Metro Line 2

en.Wedoany.com Reported - On November 9, the right-line shield tunnel of the section from Dongshan Road Station to Chenshan South Road Station (referred to as the Dong-Chen section) on Phase II of Shaoxing Metro Line 2 in Zhejiang Province, constructed by China Railway First Group under China Railway, achieved breakthrough, with the shield machine successfully entering the receiving steel sleeve. The right line of this section has a total length of approximately 1.7 kilometers and crosses the Cao'e River, which has a surface width of about 265 meters and a maximum water depth of about 11 meters. The minimum vertical clearance between the tunnel and the riverbed is only 11.5 meters.

The construction difficulties were concentrated in the shield receiving section near the river channel. This area has strong groundwater recharge and high water-rich strata, and the shield receiving process faced risks such as water and sand ingress at the portal, stratum settlement, and shield attitude deviation. The project team set up a river-crossing test section in advance to verify shield tunneling parameters, and adjusted the advance speed and correction amplitude according to stratum changes to reduce disturbance to surrounding strata caused by shield attitude changes.

In response to the high water pressure and leakage risks at the receiving end, the construction team formulated a special reinforcement plan for shield receiving, implemented grouting reinforcement for the portal and surrounding strata, and used sodium silicate dual-fluid grout for water sealing, combined with steel sleeve receiving technology to control the loss of groundwater and sand layers. Before shield receiving, the project department also conducted item-by-item inspections of the portal reinforcement effect, water-stopping measures, equipment status, and monitoring plan, and continuously monitored shield attitude, ground settlement, and surrounding environment changes during construction.

Phase II of Shaoxing Metro Line 2 connects westward to Tandu Station, the terminus of Phase I, and extends eastward to Liangzhu Avenue Station in Shangyu District, with a total length of approximately 26.1 kilometers and 7 stations. The line includes underground sections, elevated sections, and mountain tunnels, and will operate seamlessly with the Phase I line upon completion. China Railway First Group constructed Section 7, which includes Xingye Road Station (exclusive) to Dongshan Road Station and Chenshan South Road Station, involving 2 stations and 2 sections.

At present, Phase II of Shaoxing Metro Line 2 is still under construction, and subsequent work remains to be completed, including the remaining section construction, track laying, electromechanical installation, and system commissioning. Upon completion of the entire line, rail transit services will extend to the central urban area of Shangyu, forming a through-operating line with Phase I.