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Rock Mechanics

Rock Mechanics !Response of rocks to Applied Loads!CE/SC 10110/20110 Planet Earth Rock Mechanics !Response of rocks to Applied Loads!! Earth materials rocks Soils Fluids ! rocks Solid, dense aggregates of mineral grains ! Soils Anything that can be excavated by a shovel ! Fluids Water, magma, petroleum, natural gas, atmosphere Phase Relationships in Earth Materials!! rocks can be considered as three-phase systems in most cases Solid, liquid, gas ! Most rocks contain some void space between grains Voids are always filled with some type of fluid - either liquid or gas Amount of void space & amount and type of fluid influence mechanical behavior of the material !

• If shear stress exceeds the shear strength - failure occurs 21 Compressive Strength!! Relationship between shear and normal stresses during a strength test (and at failure) is critical to understanding deformation behavior of the material ! Way to test shear strength - Direct shear test Variable shear and normal stresses can be applied 22

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