Kavvadas, Michael

Litsas, Dimitris

Sitarenios, Panagiotis

This paper studies numerically the influence of different: a) steering gap openings; b) tail grouting pressures and; c) steering gap pressure gradients, on surface settlements induced during EPB tunnelling. The numerical study is performed with an advanced 3D finite element model in the Simulia Abaqus program, which provides detailed and realistic simulation of EPB tunnelling. The results reveal a significant effect of the size of the steering gap and its filling conditions (empty, full, partially filled with process liquids), while subsequent tail grouting proves to be incapable to reverse the adverse effects in ground surface settlement caused by various volume loss sources

Influence of geometrical and operational machine characteristics on ground movements during EPB tunnelling

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