“豆腐渣中打隧道”，四川这项超级工程是如何建的？

Core Viewpoint - The construction of the Chuanwen Expressway is a significant infrastructure project aimed at enhancing regional logistics capabilities and supporting national development strategies such as the Belt and Road Initiative and the Yangtze River Economic Belt [1][2]. Group 1: Project Overview - The Chuanwen Expressway, officially started in October 2024, is part of the National Expressway Network Plan (2013-2030) and is crucial for connecting Chengdu Plain to key tourist areas like Jiuzhaigou and Huanglong [1]. - The estimated investment for the project is 56.5 billion yuan [1]. - The expressway spans 198.73 kilometers, featuring a high bridge-tunnel ratio of 93.7%, with 52.7 kilometers of bridges and 133.5 kilometers of tunnels, making it the highest in Sichuan province for similar scale highways [4]. Group 2: Challenges and Risks - The project faces multiple challenges, including complex geological conditions, high seismic activity, and strict environmental regulations [5][6]. - Approximately 170 kilometers of the route runs parallel to major fault lines, with 788 identified geological hazards such as landslides and rockfalls [4]. - The construction involves navigating through soft rock formations, which poses significant risks and difficulties [5]. Group 3: Innovative Solutions - To address the complex geological environment, the construction team employs advanced surveying techniques, including aerial and drone-based methods, to accurately assess geological conditions [6]. - The project utilizes steel structure bridges to ensure lightweight construction and strong seismic resistance, minimizing environmental disruption [6]. - A third-party "safety steward" system has been introduced to enhance safety management, transitioning from reactive to proactive risk management [6][7]. Group 4: Socioeconomic Impact - Upon completion, the expressway will improve disaster response capabilities and alleviate travel difficulties for local communities, benefiting tens of thousands of residents [2]. - The project is expected to stimulate local tourism and agriculture, providing a vital transportation route for regional products such as cherries, apples, and beef [2].