TTC(SH:600326) Si Chuan Ri Bao·2026-01-10 01:50Core Viewpoint - The construction of the Yuexi Tunnel, the longest highway tunnel under construction in Sichuan, has officially commenced, marking a significant milestone for the Jinxi Expressway project [2][3] Group 1: Project Details - The Yuexi Tunnel features a separated double-tunnel design, with the left tunnel measuring 18.39 kilometers and the right tunnel measuring 18.38 kilometers, and a maximum burial depth of 1,011 meters [2] - The construction employs a combination of Tunnel Boring Machine (TBM) and large machinery, with the left tunnel utilizing the world's largest diameter double-shield TBM, measuring 13.01 meters in diameter [2] - The project team conducts geological assessments every 100 meters of excavation to ensure safety and manage geological conditions effectively [3] Group 2: Strategic Importance - The Jinxi Expressway spans approximately 211.6 kilometers, featuring a dual four-lane design with a speed limit of 80 km/h and a bridge-tunnel ratio of 75.55% [3] - This expressway is part of the Sichuan Provincial Highway Network Layout Plan (2022-2035) and is one of the 20 radial lines from Chengdu, expected to be completed and operational by 2031 [3] - The completion of this highway will end the historical lack of expressway access for the counties of Ganluo, Yuexi, and Xide in Liangshan Prefecture, enhancing the southward transportation capacity of Sichuan [3]