intro - 53:030 Soil Mechanics Notes; C.C. Swan, University...

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Introduction: Overview of Soil Mechanics 1 A. What is "soil"? 1) Not "dirt"! 2) Soil is unconsolidated earthen material comprised of discrete mineral grains and decayed organic matter, along with inter- stitial gases and liquids. -> If the grains are "permanently" bonded or cemented together, the material is called "rock" or "stone". 3) Soils tend to be fairly complex and heterogeneous materials which feature a wide range of mechanical behaviors. -> Understanding and describing the behavior of soils is the challenge being addressed in this course! 4) In general, 3 phases comprise soil: -> solid: the soil grains -> fluid: the pore fluid (typically water) -> gas : the pore gas (typically air) 53:030 Soil Mechanics Notes; C.C. Swan, University of Iowa
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a)When individual soil grains are loosely bonded together, they form a "structure" or "skeleton" which can transmit loads via contact between particles. b) When loads are applied to the soil skeleton, deformations occur. -> Typically, 95-100% of the total deformation is caused by relative motion, or sliding, of individual soil grains. -> The remaining 0-5% of the overall soil deformation is typically caused by deformation of the individual soil grains. 5) There are many different types of soils, and the difference lies primarily in the size of the grains and the nature of the bonding between them. (See table on the following page) -> We will learn how the difference between grain sizes
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This note was uploaded on 11/10/2010 for the course CIVIL 53:30 taught by Professor Swan during the Fall '09 term at University of Iowa.

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intro - 53:030 Soil Mechanics Notes; C.C. Swan, University...

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