K CEE 120-Stress Distrb with Depth

K CEE 120-Stress Distrb with Depth - Consolidation and...

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Chapter 8 Consolidation and Consolidation Settlement Section 8.12: Stress Distribution with Depth From now on we will study the distribution of stresses and resulting deformation in the soil mass and how the stresses and deformation affect the soil mass and supported structures. The stresses in the soil mass are caused by: (i) the weight of the soil itself, and we have learned how to calculate theses stresses for horizontally layered deposits, both vertical, σ v and σ v ’, and horizontal, σ h =k σ v and σ h = K 0 σ v ’, (ii) the ground surface load, (iii) change in water table, which changes pore water pressures and hence the effective stresses, (iv) excavation which typically reduces some stresses, and (v) other external loads and changes in the soil mass, including here earthquake cyclic loads.
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This lecture is about the stresses in the ground due to the ground surface load , and exclusively about vertical stresses in linearly elastic half-space Soil is not a linearly elastic material, but for the range of loads and deformation usually applied in geotechnical practice the procedures explained below give pretty good estimates for elastic-plastic material such as soil.
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The simplest case of additional vertical stresses, Δσ v , due to a widespread uniform fill , i.e., due to the fill stress at the ground surface, q FILL
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At larger depth load is distributed over larger area, into a larger volume of soil. Spreading of the ground surface load into the soil mass is down and outwards in all directions
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mass – concept of pressure bulb : With depth the pressure bulb size increases and stresses decrease. . Soil mass encircled by ground
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This note was uploaded on 11/08/2010 for the course CEE 120 taught by Professor Vucetic during the Fall '10 term at UCLA.

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K CEE 120-Stress Distrb with Depth - Consolidation and...

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