Civil Engineering Department College of Engineering Course: Soil and Rock Mechanics (CE 260) Lecturer: Dr. Frederick Owusu-Nimo.

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Civil Engineering Department College of Engineering Course: Soil and Rock Mechanics (CE 260) Lecturer: Dr. Frederick Owusu-Nimo

Soil Block Diagram

Volume of Voids, Vv = Va + Vw W = Mg

Weight / Mass relationship

Unit Mass (Density) or Unit Weight

Determination of Density For Cohesive Soils : Bulk density is determined using the core-cutter method. For Granular or Cohesion less Soil: The bulk density is determined by the Sand replacement method

Weight / Mass relationship

Volume relationships

Relationship among Sr, e, w and Gs

Example 1 Determine o Void ratio o Degree of Saturation o Wet unit mass, dry unit mass o Wet unit weight o Dry unit weight For a soil specimen; Given that o The moist mass of soil specimen is 20.7 kg o Specimen’s volume measured before drying is 0.011m 3 o Specimens dried mass is 16.3kg o Specific gravity of solids is 2.68

Example 2 Determine o Wet unit weight o Dry unit weight o Degree of saturation o Porosity For an undisturbed sample; Given that o Void ratio = 0.78 o Water content = 12% o Specific gravity of solids = 2.68