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Application of Active Support Technology for Large Deformation in Haidong Soft Rock Tunnel
(1. Yunnan Institute of Water and Hydropower Engineering Investigation, Design and Research, Kunming 650021; 2. Southwest Jiaotong University, Chengdu 610031)
Abstract 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 Tunnel3. 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 technology in the test section of the tunnel, both vertical settlement and horizontal convergence are controlled within 20cm. 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.
Abstract：
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 Tunnel3. 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 technology in the test section of the tunnel, both vertical settlement and horizontal convergence are controlled within 20cm. 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.
YANG Zhaofeng1 WANG Bo2 DU Yongquan1 HUANG Changkuan1 FAN Yong1
.Application of Active Support Technology for Large Deformation in Haidong Soft Rock Tunnel[J] MODERN TUNNELLING TECHNOLOGY, 2024,V61(3): 245-252
2024, Vol. 61 