Core Points - The Sichuan Yibin to Panzhihua Expressway's key project, the Xiejiawan Long Gas Tunnel, achieved dual-track completion on September 27, 2023, laying a solid foundation for the section's completion by 2026 [1][3] Group 1: Project Details - The Xiejiawan Tunnel is located in Yibin City, Sichuan Province, with a total length of 4,295 meters and a maximum depth of 712 meters, making it the longest tunnel in the Yibin section of the expressway [3] - The construction faced significant challenges due to the need to traverse poor geological conditions, including coal strata and karst development zones, as well as difficult material transportation [3] - The project team implemented a "no fire" process for gas control, utilized advanced geological prediction methods, and adhered to principles of short advance, weak blasting, strong support, and rapid closure during construction [3] Group 2: Project Specifications - The Yibin to Panzhihua Expressway has a total length of 446.36 kilometers, designed to a dual four-lane standard with a speed limit of 80 km/h [4] - The expressway will connect with the completed G4216 line and consists of three construction segments: from Ping Shan New City to Jinyang, Jinyang to Ningnan, and Ningnan to Panzhihua [4] - Once completed, the expressway will end the history of no expressway access for the counties of Leibo, Jinyang, and Butuo in Liangshan Prefecture [4]

四川宜攀高速深达547米的白鹤滩隧道竖井贯通 中新网成都9月23日电 (记者 刘忠俊)9月23日，四川宜宾市新市镇至攀枝花仁和区高速公路(以下简称"宜 攀高速")全线深达547米的白鹤滩隧道竖井顺利贯通。这是该隧道双幅贯通后，项目攻克复杂地质的又 一关键突破。 宜攀高速公路深达547米的白鹤滩隧道竖井贯通现场。蜀道集团供图 白鹤滩隧道是宜攀高速的"硬骨头"，作为分离式特长隧道，左线长6644米、右线长6714米，最大埋深 863米，最大日涌水量达6.18万立方米。其地处地质极端复杂区域，围岩自稳能力差，施工难度极大。 此次贯通的竖井位于隧道主洞左右线间，直径6米、深547米(相当于180层楼高)，承担右线送排风与左 线排烟功能。施工中，竖井部分段落围岩条件差，涌水、突泥、坍塌风险贯穿全程，技术与安全风险均 处行业高位。 本文为转载内容，授权事宜请联系原著作权人 中新经纬版权所有，未经书面授权，任何单位及个人不得转载、摘编或以其它方式使用。 关注中新经纬微信公众号(微信搜索"中新经纬"或"jwview")，看更多精彩财经资讯。 宜攀高速公路深达547米的白鹤滩隧道竖井施工作业现场之一。蜀道集团供图 目前，宜攀高 ...