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Study on Different Seismic Intensities and Earthquake Damage to Highway Tunnels in Wenchuan Area Affected by Earthquakes
(1 School of Civil Engineering, North China University of Technology, Beijing, 100144; 2 School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031; 3 Highway Planning, Survey, Design and Research Institute, Sichuan Provincial Communications Department, Chengdu 610041)
Abstract It is neccessary to study earthquake damage to highway tunnels in earthquake-affected areas with different seismic intensities for scientific design and earthquake fortification. Based on the earthquake-damage information regarding highway tunnels in Wenchuan, the above-mentioned study was carried out. The results show that: a tunnel was not destroyed in the area of 6-degree seismic intensity; the tunnel entrance and tunnel slope structure were smashed by rockfalls in the area of 7-degree seismic intensity; there was almost no lining damage to a hard-rock tunnel body in the area of 8～11-degree seismic intensity; slight cracks and water penetration occurred at the lining of a soft-rock tunnel body in the area of 8-degree seismic intensity; reticular cracks and large-area water penetration, concrete spalling, falling, and secondary lining collapse occurred at the lining of a soft-rock tunnel body in the area of 9-degree seismic intensity; a tunnel portal was blocked by sliding and collapse of the slope around the tunnel entrance in the area of 9-degree seismic intensity; increased secondary lining collapse occurred at the soft-rock tunnel body in the area of 10-degree seismic intensity; and surrounding rock collapse occurred at a soft-rock tunnel body in the area of 11-degree seismic intensity. These research results are significant to further study of the earthquake-damage mechanism and countermeasures for highway tunnels in earthquake-affected areas with high seismic intensity.
Keywords Earthquake intensity region; Highway tunnel; Earthquake damage characteristics
Abstract：
It is neccessary to study earthquake damage to highway tunnels in earthquake-affected areas with different seismic intensities for scientific design and earthquake fortification. Based on the earthquake-damage information regarding highway tunnels in Wenchuan, the above-mentioned study was carried out. The results show that: a tunnel was not destroyed in the area of 6-degree seismic intensity; the tunnel entrance and tunnel slope structure were smashed by rockfalls in the area of 7-degree seismic intensity; there was almost no lining damage to a hard-rock tunnel body in the area of 8～11-degree seismic intensity; slight cracks and water penetration occurred at the lining of a soft-rock tunnel body in the area of 8-degree seismic intensity; reticular cracks and large-area water penetration, concrete spalling, falling, and secondary lining collapse occurred at the lining of a soft-rock tunnel body in the area of 9-degree seismic intensity; a tunnel portal was blocked by sliding and collapse of the slope around the tunnel entrance in the area of 9-degree seismic intensity; increased secondary lining collapse occurred at the soft-rock tunnel body in the area of 10-degree seismic intensity; and surrounding rock collapse occurred at a soft-rock tunnel body in the area of 11-degree seismic intensity. These research results are significant to further study of the earthquake-damage mechanism and countermeasures for highway tunnels in earthquake-affected areas with high seismic intensity.
Keywords Earthquake intensity region; Highway tunnel; Earthquake damage characteristics
Keywords：
published: 2013-09-24
Cite this article:
CUI Guang-Yao-1,
LIU Wei-Dong-1,
NI Song-Zhi-1 etc
.Study on Different Seismic Intensities and Earthquake Damage to Highway Tunnels in Wenchuan Area Affected by Earthquakes[J] MODERN TUNNELLING TECHNOLOGY, 2014,V51(6): 1-6
2014, Vol. 51 