Synthetical analysis on monitoring of Wushaoling railway tunnel

Abstract

Wushaoling railway tunnel, the longest single-track railway tunnel in China, is the key project of Lanzhou-xinjiang railway line. It goes through four regional faults (F4-F7). The geological and geostress conditions are quite complicated. According to the characteristics of soft rock tunnel with large deformation on complicated stress condition, comprehensive monitoring is executed in construction of Wushaoling tunnel. Based on the measured results of the crown settlement, the horizontal convergence, the axial force of rock bolt, the surrounding rock pressure, the stress in steel set, the stress in shotctete and the stress and pressure in the secondary lining, the relation between surrounding rock pressure and displacement, the distribution rule of displacement, the coefficient of lateral pressure, the shared ratio of secondary lining pressure, the construction time of secondary lining etc, are analysed in this paper. The above information is feedback to the construction in time. The structure stability is analysed and the corresponding measures are adopted. It can also provide the numerical coefficients for data simulation and theoretical analysis. It is proved that the effect is reliable, the surrounding rock is stable and the structure is in good condition, providing a reliable technical guarantee for the perforation of the section. (A) This paper was presented at Safety in the underground space - Proceedings of the ITA-AITES 2006 World Tunnel Congress and the 32nd ITA General Assembly, Seoul, Korea, 22-27 April 2006. For the covering abstract see ITRD E129148. Reprinted with permission from Elsevier.