Lec8 - University of California, Berkeley Civil Engineering...

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Synclines Limbs Limbs Axial Plane Axis Anticlines DIP NO DIP University of California, Berkeley Professor Ken Johnson Civil Engineering 70 Engineering Geology Civil Engineering 70 Lecture 8 9/20/07 Deformation Styles o Rock Testing o Faulting versus Folding o Fold Terminology o Strike and Dip o Geology is 3D Structural Geology Rock Deformation Brittle Deformation Discrete planes of failure Once it hits the yield strength, there is a sudden failure Ductile Deformation The specimen just bulges out Ductile levels off Or even both o Compressive Forces Causes Z type deformation of bedding layers o Tensional Forces Extensional o Shearing Forces Rock Failures o Ductility is a function of Confining Stress – ductility increases as confining stress increases Temperature – ductility increases with increasing temperature o Stiffness and Peak Strength increase with increasing confining stress o Peak Strength and stiffness decrease with increasing temperature
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Lec8 - University of California, Berkeley Civil Engineering...

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