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Brittle Behavior Fracture Criterion for Confining Compression Fracture Criterion for Confining Compression Fracture Criterion for Tension Fractures Fracture Criterion for Confining Compression Fracture Criterion for Confining Compression The difference between max shear stress and 2q Fracture Criterion for Confining Compression 2q 2q Fracture Criterion for Confining Compression Orientation of critically stressed shear Plane Orientation of critically stressed shear Plane max C 2 1 min max C 2 1 min Griffith Cracks Griffith Cracks What happens at high confining pressures Modes of Crack Surface Displacement Griffith Cracks Griffith Cracks s1 q c a s3 Griffith Cracks Griffith Cracks s1 Initial Formation of a Shear Mode Crack Formation of a Wing Crack Griffith Cracks Griffith Cracks Shear Fracture Hydrology Petroleum Industry Building and Mining Structure Tectonics Fracture study and observations Systematic vs Nonsystematic Joint Sets Joint Systems Joint Systems Ankareh Fm Twin Creek Fm 1 LPS fans around salient perpendicular to structural trends 2 TE parallel to structural trends Why do joints stop growing Why do joints stop growing Joint Spacing Bed Thickness Stiffness Strength Young s Modulus Strain Joint Spacing Plumose Structure Why aren t joints smooth Rock Inhomogeneities Crack Tip Propagation speed Twist Hackle Extensional Direction Extensional fracture Extensional fracture Extensional Direction Tectonic Jointing Joints and Folding Membrane Effect Poisson Effect Cooling Sheeting Joints Tectonic Origin Residual Stress Sheeting Joints Columnar Jointing Questions to ask yourself about joints in the field Blocky vs Fibrous Antitaxial Syntaxial



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