a1s - Assignment 1 Solutions 1. Define clearly the...

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Assignment 1 Solutions 1. Define clearly the following terms (express in equations where possible) Effective stress ± Effective stress is a measurement of the load borne by the soil skeleton (as described/idealised by Terzaghi). It is the sum of the total overburden stress ( σ ) and the pressure due to the presence of pore water (u). σ̒ = σ – u. Pre-consolidation pressure ± The maximum in situ pressure to which a soil specimen has been subjected. Critical hydraulic gradient ± The hydraulic gradient at which the effective stress borne by the soil skeleton vanishes and piping or blow out conditions are on the verge of occurring. Zero air voids line ± The curve on a density plot representing the state at which all voids are filled completely with water (i.e. S = 100%). Coefficient of consolidation ± A measure of the rate of change of volume during primary consolidation; it can be referred to as either vertical drainage ( c v ) or horizontal drainage ( c h ). Compression index ± The slope of the normal compression line as observed on the log[ σ ’] e curve. Density index ± A measure of the relationship between the actual void ratio and the maximum and minimum void ratios. It can indicate the state of compaction of sands. Shear strength parameters ± Cohesion ( s ): the maximum strength of soil at which point significant plastic deformation or yielding occurs due to an applied shear stress. ± Friction angle ( φ ): a measure of the ability of a unit of soil to withstand a shear stress. It is the angle
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This note was uploaded on 04/19/2011 for the course CIVE 416 taught by Professor Meguid during the Winter '10 term at McGill.

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a1s - Assignment 1 Solutions 1. Define clearly the...

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