Abstract Resisting secondary disasters like a debris flow is critical during the design and construction of tunnels in regions with high seismic intensity. Based on the field survey and system analysis of the flash-flood induced portal damage to the Yingxiu-Wenchuan highway tunnel on July 9th, 2013, this paper concludes mountain loosening by the Wenchuan earthquake, stiffness and thickness insufficiencies of the backfilling material, and poor anti-erosion of the foundation in the cut-and-cover section of the tunnel are the main reasons for portal damage. It also puts forward relevant design ideas which can prevent and reduce disasters and minimize state asset losses, such as strengthening the evaluation for post-seismic potential hazards, designing beyond expectation, emphasizing quality and effectiveness of backfilling, and providing bridge-type channels for potential debris flows.
Abstract：
Resisting secondary disasters like a debris flow is critical during the design and construction of tunnels in regions with high seismic intensity. Based on the field survey and system analysis of the flash-flood induced portal damage to the Yingxiu-Wenchuan highway tunnel on July 9th, 2013, this paper concludes mountain loosening by the Wenchuan earthquake, stiffness and thickness insufficiencies of the backfilling material, and poor anti-erosion of the foundation in the cut-and-cover section of the tunnel are the main reasons for portal damage. It also puts forward relevant design ideas which can prevent and reduce disasters and minimize state asset losses, such as strengthening the evaluation for post-seismic potential hazards, designing beyond expectation, emphasizing quality and effectiveness of backfilling, and providing bridge-type channels for potential debris flows.
LIAO ,
WEI ,
LI Yu-Wen etc
.Analysis of a Flash-Flood Induced Debris Flow at a Highway Tunnel Portal in a Seismic Region[J] MODERN TUNNELLING TECHNOLOGY, 2014,V51(4): 8-12
2014, Vol. 51 