On April 10, the cutterhead of the "Hongchang" shield machine broke through on the left line of the Dongxin section (Dongxin Station to Xinhongcheng Grand Market Station) of Nanchang Metro Line 4, marking the successful breakthrough of both lines in the Dongxin section. This is another key milestone following the completion of the underpass beneath the Changfu Railway and the Shanghai-Kunming High-Speed Railway.

The left line of the Dongxin section has a total length of 1,144.948 m, and the right line is 1,186.815 m. Since the start of the project, the project department has risen to the challenges of complex and variable geological conditions, high technical requirements, high risk of shield reception in water-rich sand layers, and great construction difficulty. It carefully organized construction, formulated strong construction safeguard measures, reasonably optimized construction procedures, and innovated working approaches to accelerate construction progress while ensuring construction safety.

In response to the high risk of shield reception in the water-rich sand layers of the section, which was the biggest obstacle affecting shield machine reception in this section, the project department took solving on-site construction difficulties as its guide. Based on the geological survey report, it analyzed possible water flow directions during shield machine entry. After completion of the shield tail sealing ring, dewatering wells were added on both sides near the reinforcement body in the shield tunneling direction to effectively block water coming from behind the shield machine. No water or sand inrush or leakage occurred during shield reception.