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By neglecting the elastic strains in the plastic zones and introducing a substitution for normal stresses one achieves not only a substantial simplification of the calculation of the characteristic line but also the possibility of a clear graphical presentation of the results. This is all the more useful, as in the determination of the characteristic line even in the simplest case 9 parameters are present. Thus, in the solution of problems for which one has to predict the genuine rock pressure a better quantitative basis is provided.
Index Terms:rock; TunnelingGroup
Further Information:Date published: 1985