Application of dimension reduction in tunnel excavation problem

Abstract eng:
The paper suggests and innovative approach to modeling of the progress of tunnel excavation. The proposed method uses dimension reduction to incorporate the supporting effect of the material in the front of and behind the examined cross section. This allows to take the advantages of the efficiency and simplicity of finite element modeling with two dimensional mesh while considering the longitudinal properties such as the width of the excavated segment. The out of plane phenomenons are calibrated via in situ measurements of convergence curves in front of and behind the tunnel heading. The dimension reduction approach can serve as an alternative to often employed convergence confinement method.

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