Application of Active Support Technology for Large Deformation in Haidong Soft Rock Tunnel
Based on the Haidong Tunnel of the Central Yunnan Water Diversion Project,the adaptability of active support technology was studied in the upstream 100 m section of soft rock with large deformations in Branch Tunnel 3.Through on-site tensioning tests,loosening ring tests,and phased implementation,parameters were continuously optimized and adjusted.The control deformation effect,improvement of construction progress,and existing problems were analyzed and evaluated.Finally,design parameters for active support under similar geological conditions and dynamic adjustment principles were summarized.The study shows that after the application of active support tech-nology in the test section of the tunnel,both vertical settlement and horizontal convergence are controlled within 20 cm.The excavation advance rate increased from 15 m per month to 45 m per month.Active support technology has a good application effect in controlling deformation in hydraulic tunnels and improving work efficiency.
Central Yunnan WaterDiversion ProjectHaidong TunnelSoft rock large deformationActive supportDeformation controlProgress
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