Abstract
By a new triaxial compression method, in which all three principal stresses are independently controllable, the effects of stress states on fracture and flow properties of roks were experimentally studied. Strength, ductility, strain-hardening, stress drop and fracture angle are obtained as funstions of the intermediate principal stress σ 2 and the minimum principal stress σ 3. These deformational properties are affected by σ 3, but also by σ 2, although these two effects are additional in some properties, but opposite in other ones. The original Mohr theory cannot predict the observed effect of the general stress state on fracture angles, because the theory assumes that the intermediate principal stress σ 2 has no effect. However, a modified application of this theory may make it possible to predict the fracture angle from the strength data under general stress states.
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