Abstract
The creep deformation of the polycrystalline salt rocks can physically be explained on the basis of the theory dislocation. By use of model concepts from the physics of metals one can deduce two different types of creep laws whose scopes of validity differ in stresses and temperatures. Logarithmic time laws describe creep processes quickly decreasing that do not produce fracture. Potential laws describe creep deformations that result in fracture after a more or less long period of time. The stress separating the scopes of validity of the two law is the long-term resistance of the salt rocks. By extensive laboratory studies and measurements as well as practical experience in salt mining, theoretical deductions are confirmed on carnallitite. The results have become part of a dimensioning procedure for pillars in potash mining.
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