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DETERMINATION AND VERIFICATION OF THE LONGITUDINAL DEFORMATION PROFILE IN A HORSE-SHOE SHAPED TUNNEL USING TWO-STAGE EXCAVATION (2008)
The LDP of two-stage excavation is analysed by 3DEC and verified against measured data of the upper side walls in Zipingpu Tunnel in China. Furthermore, the difference of LDP between full face excavation and two-stage excavation is investigated by 3DEC under different geo-mechanical conditions of the surrounding rock and different in-situ stress conditions. Finally, the method of determining the LDP and its empirical equation are suggested for large tunnels using two-stage excavation. The empirical equation can be easily and quickly applied for deformation analysis and stability judgement for large underground excavations.
5th International Conference and Exhibition on Mass Mining, Lule, Sweden, 2008
Lule University of Technology, Sweden