Integral Criterion for Determination of Tensile Strength and Fracture Toughness of Rocks

Abstract

The method of determining strength characteristics of rocks subjected to tension is tested; the method is based on processing of data from fracture tests of specimens with axial holes of different diameters subjected to loading along diameter. The test data of specimens of rocks and simulating media in the form of cores with axial holes and fractured along diameter are processed based on the integral strength criterion of Novozhilov. The comparison shows good agreement between the fracture toughness and tensile strength values obtained using the proposed method and in standard measurements.