Civil Engineering Department College of Engineering Course Soil

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

Soil Block Diagram

Soil Block Diagram Volume of Voids, Vv = Va + Vw W = Mg

Weight / Mass relationship •

Unit Mass (Density) or Unit Weight •

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 • For a soil specimen; Given • Determine that o The moist mass of soil specimen is 20. 7 kg o Void ratio o Degree of Saturation o Specimen’s volume measured before drying is 0. 011 m 3 o Wet unit mass, dry unit mass o Specimens dried mass is 16. 3 kg o Wet unit weight o Specific gravity of solids is 2. 68 o Dry unit weight

Example 2 • For an undisturbed sample; Given that o Void ratio = 0. 78 o Water content = 12% o Specific gravity of solids = 2. 68 • Determine o Wet unit weight o Dry unit weight o Degree of saturation o Porosity