A rock mass is primarily deformed by its weight and by the mechanical interaction with adjacent materials. In quantifying these interactions and in tracing their deformational effects into the interior of a rock body, one has to rely on the basic concepts of stress and strain. The elements of these concepts will be dealt with in this opening chapter. Special attention will be paid to the adaptations of the stress concept that become necessary when dealing with fluid-filled porous rocks.
KeywordsPore Pressure Fluid Pressure Simple Shear Material Line Stress Vector
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