Fig. 6From: An approach to hydraulic fracture in geomaterials through a porous brittle damage material modelSensitivity analysis on tensile strength. Failure surfaces in the Mohr plane for the three values of tensile strength \(T_c= 3,\,4\), and 5 MPa. Figure shows two Mohr’s circles corresponding to the geostatic state and to the state characterized by a fluid pressure able to cause the failure of the materialBack to article page