From the main constitutive equations for rock salt, which have been developed by various authors let us mention those formulated by Vawersik et al. If this procedure can be used for rock salt is certainly questionable. Since within the framework of classical metal plasticity the mean stress does not play any role and since the volumetric deformation of metals is eventually considered to be elastic, the procedure is based on the idea to find a "universal stress strain curve" and to obtain via this concept a triaxial constitutive equation for rocks. Since rock salt deforms significantly by creep, various rheological models have been developed mainly starting from the already existing models for metals. Besides the mining engineering reasons considering rock salt a raw material, some additional reasons emerged in the last decades what concerns the problem of deep underground storage cavities in rock salt either for oil or natural gas, or for permanent repositories for radioactive or chemical wastes (see Wallner 1984). Das ermittelte Modell wird auf zwei typische Bergbau-Problemen angewendet: Spannungsverteilung, Dilatanz und Bruch um tiefe vertikale Bohrlöcher und um horizontale Tunnel.ġ INTRODUCTION A great deal of efforts have been devoted in the last years to the formulation of constitutive equations for salt. Es werden vereinfachte Varianten der konstitutiven Gleichungen vorgeschlagen und ebenfalls mit den Daten verglichen. Die Verhersagen des Modells stimmen gut mit den Meβdaten ueberein. Die konstitutive Gleichung enthalt die Beschreibung der irreversiblen Dilatanz und Kompression, Verfestigung sowie Bruch.
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Es wird gezeigt, wie die konstitutiven Konstanten und Funktionen aus den Versuchen ermittelt werden.
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Eine vorlaufige Gleichung wird auf der Basis echt triaxialer,Versuche formuliert. ZUSAMMENFASSUNG: Die Arbeit enthalt eine Prozedur zur Ermittlung einer elastisch/viskoplastischen konstitutiven Gleichung fuer Steinsalz. Le modèle obtenu est après applique pour resoudre deux problèmes typiques de l"industrie minière: la distribution des contraintes, la dilatance et la rupture autour de puits profonds et des tunnels horizontaux. De variantes simplifiees de la loi de comportement sont aussi proposees et on fait aussi une comparaison avec les experiences. La prediction du modèle compare très bien avec les donnees experimentalles. La loi de comportement peut decrire la dilatance ou compressibilite irreversible, l"ecruisage et la rupture. On montre comment peut-on determiner les coefficients constitutifs constants ou fonctions en partant de ces experiences. Une equation preliminaire est formulee en utilisant les experiences triaxialles vrais. RESUME: L"article contient une methode pour obtenir la loi de comportement elasto/viscoplastique pour Ie self. The obtained model is then applied for two typical mining problems: stress distribution, dilatancy, and failure around deep vertical wells and horizontal tunnels. Simplified variants of the constitutive equations are also proposed and a comparison with data is done as well. Predictions of the model compare very favourably with the data. The constitutive equation incorporates the description of irreversible dilatancy and compression, work-hardening, and failure. It is shown how constitutive constants and functions are obtained using these experiments. A preliminary equation is formulated based on true triaxial tests. at the point a(t) r.-Įquation the elastic para-eters are involvedĪBSTRACT: The paper contains a procedure for obtaining an elastic/viscoplastic constitutive equation for rock salt. Nonassociated constitutive equations where.i.e. (10) with F - B is not satisfied, one has to use With an associated constitutive equation, but if We say that the constitutive equation is associated. Needs creep tests lasting a very long time: If these In order to find the expression of'function H(o) one AsYthe aubsequent corrections are is the following.' First the yield stress for roc.otel! The reason for choosing such a constitutive equation
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Of 0, which will be denoted byLo (H - from hydro- ' Starting' from a certain desired magnitude is the equation of the stabiliz tion bdundaries, equation is formulated based on true triaxial tests. ABSTRACT: The paper contains a procedure for obtaining an elastic/viscoplastic constitutive equation for rock