CE2004 seepage and effective stress_handout

CE2004 seepage and effective stress_handout - Seepage and...

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Unformatted text preview: Seepage and effective stress CE2004 What well cover Stress in soils What is it? (and why is it important?) Total and effective stress Saturated soils Partially saturated soils Stress in soil Force transmitted . Relevant to: Compaction & .. Slope stability Drainage Karl von Terzaghi 1883-1963 Need to remember theory treats soil as a solid (single phase material) P P = P A Where: = total normal stress (at a surface) P = force (normal) applied over A = area What is the pressure (load) acting on (resistance)? What happens when pressure (load) .? Stress in soil: definitions Total normal stress ( ) .. per unit area on a plane within the soil Effective normal stress ( ) Stress transmitted through .. on the plane Pore water pressure ( u ) Pressure of water in . = + u p p Grain contacts in a real soil wavy plane how big an issue is this? N = N A Where: = effective stress N = normal stress at each contact A = area Note: contacts are very small (essentially points) So: P = N + uA So: P / A = N / A + u So: = + u Effective stress: impact of weight of...
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This note was uploaded on 11/23/2011 for the course ENGINEERIN H203 taught by Professor Michael during the Spring '09 term at Brunel University.

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CE2004 seepage and effective stress_handout - Seepage and...

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