Erguxi Soil Tunnel Construction And Disaster Treatment Technology

The Erguxi tunnel, formerly known as the Zagunao tunnel, is one of the317state line road, Shiziping Hydropower Station in the rebuild project of key control projects. The tunnel Construction started in September17,2005from the Lixian into a hole, September18,2007through, December1,2006began to do second lining, and on December1,2007to complete the dark hole in the lining, the open-cut tunnel lining completed in December29,2007, total construction period lasted for27months. Gravel soil, through the Quaternary moraine layer around the hole of the tunnel rock stratum, is a typical soil tunnel.The Erguxi tunnel, due to its special geological features, in the construction constraints prone to collapse, shallow buried large section of the surface crack, deformation and landslide risk, choose good construction method can largely avoid these risks. This article has chosen the suitable for the geological conditions of three kinds of method comparison, obtained relatively optimal construction method.On May12,2008,8magnitude earthquake happened in wenchuan. The Erguxi tunnel is located in Miyaluo, and the epicenter Yingxiu linear distance of160km, affected by the earthquake. Shortly after5.12, tunnel hole week, backplane, in cable trench, inlet side wall cracks in varying degrees are, with the passage of time and erosion of the rainy season, the Erguxi tunnel deformation and cracking of the development trend of rising, seriously affected the national highway317line of traffic safety, so it is urgent to reinforce the regulation of the tunnel. This article obtains from the earthquake damage characteristics of Erguxi tunnel, formulate corresponding measures for earthquake monitoring, the development of the cracks of the tunnel, two lining deformation, slope deformation monitoring, Erguxi tunnel seismic damage analysis of monitoring data of development trends, to develop the corresponding treatment measures.Because of the dynamic characteristics of the concealment of the tunnel and construction, the tunnel diseases repairing process is relatively complicated. The implementation of the measures for harnessing by local climate, environment and the situation of tunnel deformation and so on many factors, some treatment measures are not implemented, the cracks,deformation and slope instability of the Erguxi tunnel intensified, the overall stability are badly affected, considering the traffic safety of G317line, The Erguxi tunnel has been closed on October8,2013.