国内首条穿越泉域岩溶区地铁通车运行

Core Viewpoint - The opening of Jinan Metro Line 4 marks the first subway line in China to traverse a karst aquifer area, emphasizing the importance of ensuring harmony between the subway and local spring water resources [1][2]. Group 1: Project Details - Jinan Metro Line 4 is located close to the famous Baotu Spring, with the nearest point being only 1.4 kilometers away [1]. - The construction faced significant challenges due to the geological environment, leading to extensive preliminary exploration and the adoption of the "avoidance and elevation" principle to minimize impact on sensitive water areas [1]. - The section between Quancheng Park Station and Qianfoshan Station is the first subway segment in China to pass through a karst aquifer, encountering nearly 300 caves of varying sizes during construction [1]. Group 2: Technical Innovations - Advanced geological forecasting technology and a smart management platform were utilized to scan the geological conditions ahead of the tunnel, allowing for targeted design of the tunneling equipment [1]. - A soil pressure balance shield tunneling machine was employed to prevent ground subsidence, effectively addressing the technical challenges of tunneling in the karst area [1]. Group 3: Environmental Impact - The depth of Quancheng Park Station was raised by approximately 7 meters compared to other stations, resulting in a "semi-underground station" design [2]. - Water diversion channels were designed at critical stations to ensure the continuous supply of spring water, functioning like a "communicator" [2]. - Data indicates that the groundwater level of Baotu Spring reached 30.32 meters this year, the highest since 1966, suggesting that the measures taken to protect the spring are effective [2].