Ground reaction curves of a tunnel excavated in a good quality rock mass showing different types of post-failure behaviour
The costs of ground support and reinforcement in underground works and tunnels is significant, but even more costly would be a support failure or a tunnel face collapse. The authors of this paper have been working in the development of techniques to obtain Ground Reaction Curves (GRCs) for tunnels excavated in brittle and strain-softening (or strength weakening) continua, as well as in the post-failure dilatant behaviour of rock masses. This study is an extension towards brittle behaviour of the work on strain-softening rock masses presented in the ISRM International Congress by members of the group. This particular study regards a tunnel excavated in a good quality rock mass, being estimated all of its significant parameters and its ground reaction curve obtained for increasing levels of model complexity and realism. To determine the residual strength parameters of the rock mass, the GSI system approach has been used. After the different models had been built, the integration techniques for strain softening behaviour have been used to obtain the corresponding GRCs. The effects of the standard support and reinforcement are also assessed.
L.R.Alejano A.Rodriguez-Dono G.Fdez.-Manín E.Alonso
Department of Natural Resources & Environmental Engineering, University of Vigo, Spain
国际会议
香港
英文
1-5
2009-05-19（万方平台首次上网日期，不代表论文的发表时间）