Core Insights - The "Tongnong Garden Dream" shield machine has completed over 60% of its total excavation length, reaching a significant milestone of 7,000 meters in the construction of the Suzhou East Tunnel of the Tongnong High-speed Railway [1] - The Suzhou East Tunnel, measuring 15.565 kilometers, is recognized as China's highest standard and longest urban high-speed railway tunnel, designed for a speed of 350 kilometers per hour [1] - The project employs advanced technologies, including a unique "synchronous push and assembly + synchronous double-liquid grouting" method, which enhances construction efficiency by approximately 30% [3] Construction Progress - The shield machine has achieved a record daily excavation of 34 meters, weekly progress of 198 meters, and monthly progress of 734 meters, setting new benchmarks for large-diameter high-speed railway tunnel construction in China [6] - The second section of the tunnel, measuring 6,224.8 meters, presents increased safety risks due to high water pressure and the need to navigate through important municipal roads and structures [8] Technological Innovations - The project integrates several leading technologies, including a retractable main drive, cutter head monitoring systems, and high-pressure shield tail features, to ensure efficient and safe construction [3] - The use of intelligent construction technologies, such as advanced geological forecasting systems and autonomous excavation systems based on big data and AI, is crucial for maintaining safety and efficiency during the excavation process [8] Strategic Importance - The Tongnong High-speed Railway is a vital component of China's "eight vertical and eight horizontal" high-speed rail network, contributing significantly to the development of the Yangtze River Delta region and enhancing regional connectivity [8]