en.Wedoany.com Reported - After six years of construction, all 19 tunnels in Phase I of the Honghe section of China's Central Yunnan Water Diversion Project were completed on June 16. These tunnels have a total length of 93.76 kilometers, with the Longshu Tunnel, constructed by China Railway Tenth Group under China Railway, being completed on the same day.
The Longshu Tunnel is a core control project of the Honghe section of the Central Yunnan Water Diversion Project, with a total length of 12,925 meters and a maximum burial depth of 270 meters. The geological conditions along the tunnel are complex, with poor surrounding rock stability. Class IV and V surrounding rock accounts for 85%, and adverse geological conditions are widespread. Coupled with narrow working spaces, difficult ventilation and drainage, and the impact of variable mountain climates, tunnel excavation, construction organization, and safety management face multiple challenges.
The project team installed a real-time monitoring system for toxic and hazardous gases at the working face, enabling real-time transmission and early warning of risk data, and conducted over ten full-scenario emergency drills for water and mud inrush, gas leaks, and other incidents. The team repeatedly refined construction procedures, conducted dozens of on-site tests on key aspects such as advance support, arch forms, grouting pressure, and consolidation length, optimized support parameters, and developed new grouting techniques suitable for complex fractured strata. Through advanced geological forecasting and full-area gas monitoring technologies, the project overcame construction challenges in complex geological conditions such as fractured strata and loose rock masses, safely crossing 18 fault zones and fracture zones in total.
The Central Yunnan Water Diversion Project is a landmark project among the 172 major water-saving and water supply projects identified by the State Council, and it is also the largest water resource allocation project in Southwest China. Construction began in October 2018. The project adopts a phased construction approach, with Phase I being the main water conveyance trunk and Phase II being the branch water conveyance lines. The total length of the main water conveyance line is 664 kilometers. Currently, excavation of Phase I has exceeded 95%, and Phase II is approximately 93% complete. The starting point of Phase I of the Honghe section is Qujiang at the boundary between Yuxi and Honghe, and the endpoint is Xinpobei at the boundary between Gejiu and Mengzi in Honghe Prefecture. The total length of the main water conveyance canal is 109.51 kilometers, with structures including tunnels, aqueducts, culverts, and inverted siphons.
Once the project is operational, it will optimize the water resource layout in Central Yunnan, improve the ecological environment of plateau lakes, and benefit 11.12 million people across six prefectures (cities) along the route.
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