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Wyznaczanie odporności skał na pękanie na przykładzie granitu ze złoża Grabina Śląska

Korzec A.

Przegląd Geologiczny

2013

Vol. 61, nr 10

576--582

This paper discusses some aspects of rock fracture mechanics which should be considered in the design of excavations and slopes stability analyses in jointed rock masses. Fracture toughness is a key parameter in a fracture criterion commonly used to predict crack initiation and propagation. Such a criterion is widely known but still not applied in practical geo-engineering calculations because of the inherent complexity of rock masses. A review oftensile fracture toughness measurement methods ofrocks is presented, with a detailed description of the chevron bend method employed to determine the tensile fracture toughness of the Grabina Śląska granite with consideration of the material micro-structure. Noticeable differences in the magnitude of this parameter in three orthogonal directions have been observed, as their three values are equal to 0.78 MPa m1/2, 1.24 MPa m1/2 and 1.43 MPa m1/2, with variations of about 10%.