Recently, the right line of the Guanghuamen Station–Minggugong Station section of Nanjing Metro Line 6 and the mined tunnel at Minggugong Station were successfully holed through, marking the completion of holing through on both lines of the Guanghuamen Station–Minggugong Station section.

The Guanghuamen Station–Minggugong Station section is located in Qinhuai District. The section starts in the south at Guanghuamen Station at the intersection of Daguang Road and Yudao Street, runs from south to north along Yudao Street, crosses Ruijin Road, and then connects to Minggugong Station. The right line of the section has a total length of 1,623.47 meters and a burial depth of 17.46 to 33.55 meters. The shield machine was launched from Minggugong Station and drove from north to south, and was received at Guanghuamen Station. Schools, commercial, residential and office buildings are distributed on both sides along the project route, and underground pipelines are dense within and around the site. In addition, the strata crossed by the shield are mainly moderately weathered sandy conglomerate, silty clay, moderately weathered mudstone, silty mudstone and argillaceous siltstone. The minimum horizontal curve radius of the section is 350 meters, and the maximum longitudinal slope is 28‰ uphill. The construction environment is complex and the safety risk is high.

During construction, the project department organized carefully and managed scientifically, and adopted multiple measures to steadily advance construction. First, industry experts were invited to conduct "expert consultations" on key control links of construction, and experts were organized to review and demonstrate the project construction plan to ensure its rationality and applicability. Second, grid-based management was implemented, safety responsibilities were fulfilled at every level, special emergency plans for safety risks were formulated, and corresponding measures were taken in a timely manner according to actual production conditions to resolve safety risks and ensure safe and smooth construction. Third, control of the construction process was strengthened. According to changes in the strata crossed by the shield and feedback from surface monitoring data, tunneling parameters were adjusted in real time and the tunneling attitude was strictly controlled. At the same time, the process requirements of "advance pipe roof, strict grouting, short excavation, strong support, quick closure and frequent measurement" were strictly followed, and the progress of initial support construction of the mined tunnel was steadily and solidly advanced under the premise of strictly controlling crown settlement.