Recently, as the "Zhuimeng" shield tunneling machine broke through the soil, the shield tunneling section from Nanta Station to Wenfu Road Station of the Shenyang Metro Line 3 Phase I project undertaken by the Urban Rail Transit Company of China Railway 15th Bureau achieved twin-tube breakthrough.

The section that broke through this time starts from Nanta Station, runs westward along Wenhua East Road, and ends at Wenfu Road Station. The line is approximately 733 meters long, of which the shield-driven section is about 551 meters and the mined section is about 183 meters. The spacing between the two tubes of the section is 12-17 meters, and the longitudinal profile of the line presents a "V"-shaped slope with a maximum gradient of 25‰. This shield tunneling section features a long distance and a small turning radius, making the tunnel prone to overall deviation and the axis difficult to control, with a large workload for serpentine correction. In addition, in the first 390 rings of excavation, it needs to continuously pass beneath multiple Level I and Level II risk sources, placing extremely high demands on excavation precision and involving a high construction risk coefficient.

Since entering shield construction, in order to complete the construction task safely and efficiently, the project department has kept a close watch on the front line, planned ahead, and adopted precise measures. It has prepared various emergency plans, accurately analyzed the key and difficult points of the project, and formulated detailed construction plans and technical measures for high-incidence risks such as cutterhead mud cake formation, complex geological conditions, shield construction gushing, and passing beneath multiple risk sources. During construction, the project department has consistently adhered to the leadership shift system, implemented pre-shift education, and strengthened technical training, making shield construction safer and segment assembly more standardized and uniform.