Abstract:

More than 40 opencut (shed) tunnels on G213 Yingwen Road, G213 Chuanwen Road, G317 Wenma Road, G245 Wugan Road, S209 Longsan Road and S463 Yasan Road built after 5·12 Wenchuan Earthquake were tracked and investigated after the earthquake, rainstorm and other disasters. A comprehensive statistics on the distribution of diseases are made, the types of diseases are systematically described, and the causes, treatment measures and effects are analyzed in detail. The results show that the following works should be done well in the construction of opencut(shed) tunnels: (1) site selection and investigation, reasonabe estimation of the impact load, and optimal structure selection; (2) reliable antiimpact structure to ensure the stability of the lower slope; (3) strengthening study of the impact resistance of the structure and buffer layer setting up; (4) safety protection during construction period and construction quality guarantee.

Key words: opencut(shed) tunnel, disease of opencut(shed) tunnel, disease treatment