The method of determining the characteristics of initial stresses in an intact rock mass caused by the action of gravitational or tectonic forces on the base of back analysis of full-scale measurements results concerning the rock pressure on the lining, displacements or convergence of lining points, stresses in structure elements or other factors is proposed in the paper presented. The work is supported by Russian Fundamental Research Foundation (grant No96–05–00057C).
On propose la methode de determination des caracteristiques des contraintes initiales dans le massif vierge dues à l'action des forces gravitationneles ou tectoniques. Cette methode repose sur l'analyse inverse des resultats des mesures directes concernant la pression de terrain sur le blindage d'un tunnel, les deplacements ou la convergence des points du blindage, les contraintes dans les èlement de constructions et les autres facteurs. Ce travail est soutenu par la Fondation Russe des recherches scientifiques (grant No96–05–00057C).
Angeboten wird eine Methode zur Ermittlung der Kennlinie des Naturspannungsfeldes in einem undislozierten Gebirgsmassiv bedingt durch die ‘Auswirkungen von Gravitations - und tektonischen Kraften auf Grund der Rueckanalyse von Resultaten’ der Narurdruckmessungen an der Tunnelverkleidung, von Verschiebungen bzw. Konvergenz der Verkleidungspunkte, Spannungen in den Konstruktionselementen und weiteren mitwirkenden Umstanden. Die Arbeit ist vom Russischen Fond fuer Grundlagenforschungen unterstuetzt (grant No96–05–00057C).
At present for designing tunnel linings and mine working support the design methods based on the investigation of interacting the underground structures and the surrounding rock mass as or numerical solutions of the corresponding plane contact problems for a ring of an arbitrary shape simulating the structure in a linearly deformable or visco-elastic medium simulating the rock mass are widely applied. However the results of designing underground structures being obtained by those methods substantially depend on the characteristics of the initial stress field in an intact rock applying as input data, namely on values of the N1 principal stress, the λ *= N2 / N1relation of principal initial stresses and the α angle of inclination of principal stress axes to the horizontal and the vertical. That is why experimentally-analytic design methods are developed consisting in the indirect determination of the above characteristics of initial stresses on the base of special interpretation of full-scale measurement results concerning the rock pressure on the lining, displacements or convergences of lining points, stresses in structure elements or other factors, and employing the characteristics obtained 'as input data for the further design.
The characteristics of the initial stress field determined on the base of measurements do not depend on structure parameters and may be applied for the design and calculation of another lining differing from the measurement object constructed in similar geological conditions.
In connection with that the method of the interpretation of full-scale measurement results based on the analytic solution of the elasticity theory plane contact problem for a ring of an arbitrary shape (with a single axis of symmetry) simulating the tunnel lining.
