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Abstract: Large shotcrete excavations in cohesionless soils require extensive measures, so that the excavation can be carried out in a safe way. Especially underneath existing buildings, the excavations should be carried out with minimal settlements. To be able to guarantee an excavation with the least possible settlement occurrence, various production methods exist. In this paper the results of...
Abstract: For sprayed concrete tunnelling in loose soils, spiles and face-bolts are often employed as micro pile systems to stabilise the roof and the face of the tunnel. In this paper, four different construction methods of spile umbrellas will be presented for which extensive site measurements are available. These results will be compared with values from numerical simulations on a three-dimensional...