ECIV 330 Soil Mechanics Chapter5 Compressibility of Soil

ECIV 330 Soil Mechanics Chapter5 Compressibility of Soil -...

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ECIV 330 Soil Mechanics Prof. Bill X. Yu Spring, 2008
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Spring 2008 ECIV 330, Soil Mechanics,Bill X. Yu, Ph.D., P.E. Chapter V Compressibility of Soils ± Requirements ² How much settlement a building will experience ² How long it will take for the settlement to accomplish ² Experiments and analyses to determine the parameters required for consolidation analyses
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Spring 2008 ECIV 330, Soil Mechanics,Bill X. Yu, Ph.D., P.E. 5.1 Introduction ± Elastic settlement (immediate settlement): caused by the elastic deformation without any change in the moisture content. Calculation based on elasticity theory ± Primary consolidation settlement: results of a volume change in saturated cohesive soils because of expulsion of water that occupies the void spaces ± Secondary consolidation: observed in saturated cohesive soils and is the results of the plastic adjustment of soil fabrics. Occurs at constant effective stress. Settlement Time Consolidation settlement Initial settlement Final settlement s c e T S S S S + + =
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Spring 2008 ECIV 330, Soil Mechanics,Bill X. Yu, Ph.D., P.E. Introduction ± Time Process of Settlement
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Spring 2008 ECIV 330, Soil Mechanics,Bill X. Yu, Ph.D., P.E. Introduction ± Secondary settlement
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Spring 2008 ECIV 330, Soil Mechanics,Bill X. Yu, Ph.D., P.E. Introduction ± Elastic settlement profile and contact pressure in clay a) flexible foundation; b) rigid foundation
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Spring 2008 ECIV 330, Soil Mechanics,Bill X. Yu, Ph.D., P.E. Introduction ± Elastic settlement profile and contact pressure in sand: a) flexible foundation; b) rigid foundation
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Spring 2008 ECIV 330, Soil Mechanics,Bill X. Yu, Ph.D., P.E. Introduction ± Immediate settlement – based on theory of elasticity
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Spring 2008 ECIV 330, Soil Mechanics,Bill X. Yu, Ph.D., P.E. Introduction ± Immediate settlement – based on theory of elasticity m=L/B
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Spring 2008 ECIV 330, Soil Mechanics,Bill X. Yu, Ph.D., P.E. Introduction ± Immediate settlement – based on theory of elasticity
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Spring 2008 ECIV 330, Soil Mechanics,Bill X. Yu, Ph.D., P.E. 5.2 Elastic Settlement in Sand ± Vertical strain in sands before foundations (Schmertman method)
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Spring 2008 ECIV 330, Soil Mechanics,Bill X. Yu, Ph.D., P.E. Elastic Settlement in Sand ± Schemertmann method Strain influence factors for use with Schemertman method to estimate settlement of foundations on sand, I v Foundation depth correction Creep correction n e S C C S Δ = Δ 2 1
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Spring 2008 ECIV 330, Soil Mechanics,Bill X. Yu, Ph.D., P.E. Elastic Settlement in Sand ± Example
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Spring 2008 ECIV 330, Soil Mechanics,Bill X. Yu, Ph.D., P.E. 5.3 Elastic Settlement in Clay ± Elastic settlement for clay
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ECIV 330, Soil Mechanics,Bill X. Yu, Ph.D., P.E. Elastic Settlement in Clay
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This note was uploaded on 09/08/2009 for the course ECIV 330 taught by Professor Yu during the Spring '08 term at Case Western.

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ECIV 330 Soil Mechanics Chapter5 Compressibility of Soil -...

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