Abstract
Finite element method is used to calculate the crack-tip stresses of rock specimens under plane compression-shear loading in order to study the mechanism of plane shear(Mode II)fracture. Numerical results show that both the tensile and shear stresses exist at the crack tip and the ratio of maximum shear stress to maximum tensile stress,τmax/σ1,is about 3-6. Since the additional compressive can restrain tensile stresses at the crack-tip, τmax can easily reach its limited value before σ1 and cause plane shear(Mode II)fracture. Plane shear-box test is a potential method for obtaining Mode II fracture of rock and determining Mode II fracture toughness KIIC of rock.
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