Beschreibung der Festigkeit von Fels unter echten triaxialen Bedingungen mit der Grenzbedingung nach Mogi‐Coulomb.

Describing rock strength under true triaxial conditions with the limit condition of Mogi‐Coulomb It is known that investigations of rock strength under true triaxial conditions can show the influence of the mean principal stress on failure. For numerical calculations of tunnels and boreholes, where the mean and minimum principal stresses are not identical, limit conditions that take into account the influence of the mean principal stress would be advantageous. With the limit condition according to Mogi‐Coulomb, unlike with the well‐known limit condition according to Mohr‐Coulomb, the influence of the mean principal stress can be taken into account. At the same time, however, these two limit conditions are identical for triaxial extension and compression. In order to be able to map limit states even more appropriate, the modified limit condition according to Mogi‐Coulomb is presented in this article. In this modified form, the limit conditions according to Drucker‐Prager and von Mises are included as a special case. In order to understand the Mogi‐Coulomb criterion and to show possible applications, the present article shows its form, the influence of the parameters, the convexity and parameter acquisition of laboratory tests are examined. [ABSTRACT FROM AUTHOR]