ABSTRACT

After a brief review of the convergence-confinement method, the paper presents some possible applications of the ground reaction curves showing its usefulness for the analysis of underground excavation problems. In fact a ground reaction curve can be defined by means of numerical analyses for any type of geometry and loading condition. Subsequently, the concept of the ground reaction curve as lower boundary for a region of possible equilibria is also presented and discussed. Due to the fact that the ground reaction curve is determined by a progressive reduction of the support pressure, the stress state within the failure zone around the tunnel is at failure limit. However, in case of an increasing support pressure after lining placement, a recompression of the ground in radial direction can be observed. In these cases the final equilibrium will be above the ground reaction curve.

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