Abstract
Based on numerous laboratory test results a three-dimensional, nonlinear computation is carried out to analyze the critical zones in the overburden and the safety of tunneling by the New Austrian Tunneling Method (NATM). Comparison with measured surface settlements indicated that the intermediate soil parameters used for the numerical step-by-step analysis deliver useful results. An arching effect above the tunnel face, which is necessary for the stability of the excavation process, could be determined by means of calculation.
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