A Criterion for Brittle Failure of Rocks Using the Theory of Critical Distances

摘要: This paper presents a new analytical criterion for brittle failure of rocks and heavily over-consolidated soils. Griffith’s model randomly oriented defect under biaxial stress state is used to keep the simple. The improved because maximum tensile strength not evaluated at boundary but certain distance from boundary, known as half critical distance. fracture point method, part theory distances, which utilised in mechanics. proposed has two parameters: inherent strength, σ0, ratio half-length initial crack/flaw distance, a/L. These parameters are difficult measure they may be correlated with uniaxial compressive strengths, σc σt. able reproduce common range ratios overconsolidated soils (σc/σt = 3–50) influence several microstructural rock properties, such texture porosity. Good agreement laboratory tests reported literature found low-confining stresses.