Core Insights - The Jinan Metro Line 7's construction has made significant progress with the successful launch of the shield machine "Chunlei" for a 597-meter underground excavation, marking a fast-tracked phase for the project [1] Group 1: Challenges Faced - The excavation process is characterized by high difficulty, including sharp bends with a minimum radius of 360 meters and steep slopes of 25‰, requiring precise control of the machine's posture [3] - The project must navigate through complex geological conditions, including various soil types such as gravel, cemented gravel, silty clay, and different degrees of weathered rock, necessitating dynamic adjustments to excavation parameters [3] Group 2: Safety and Technology Measures - To ensure the safe progress of "Chunlei," the project team employs a combination of advanced techniques, including synchronized grouting and secondary grouting to fill voids and minimize ground disturbance [5] - A smart excavation strategy is implemented, optimizing core parameters like pressure and speed based on real-time geological data and monitoring [5] - The project utilizes a shield intelligent management system for precise axis control, settlement prediction, and construction visualization, enhancing risk anticipation and operational efficiency [5] Group 3: Future Outlook - The Jinan Metro Group's management team for Line 7 aims to continue leveraging technology and craftsmanship to advance construction, contributing to a more comprehensive urban transit network and enhancing city mobility [5]