Department of Earth Science |Northeastern Illinois University

INTRODUCTION TO GEOTECHNICAL ENGINEERING
ESCI 340
Spring, 2007

Daily Objectives #9  (February 8, 2007)                                                        Dr. Sanders

By the end of today's class, you should be able to do the following:

* Solve weight-volume problems that ask you to use the values of some soil properties to calculate the values of others.

* Using index cards, construct  soil phase diagrams that represent the relative proportions of mineral, fluid, and gas phases of a soil.  Cut the index cards apart to separate the phases.  Please use the following color scheme:

mass: green cards  
weight: blue cards
volume: yellow cards
F (HINT: what is the mass of the gas phase of a soil?)
 F (HINT: what is the weight of the gas phase of a soil?) You will need two volume cards!
         
* Using a poster sheet  and a pen, arrange the cards to represent  the following properties of soil:

        q moisture content (w)

  q porosity (n)

        q degree of saturation (S)

        q unit weight : 

                s  unit weight of the soil sample (g)

                s  unit weight of water (gw)

                s  dry unit weight (gd)
  q density :

                s  density of the soil sample (r)

                s  dry density (rd)

                s  density of water (rw)

       q specific gravity of solids (Gs) 

       q void ratio (e)

       q relative density (Dr)
      
* Answer Practice Problems 4.1-4.3 (p. 113), 4.6 and 4.7 (p.114).
Department of Earth Science | Northeastern Illinois University

© 2007 Laura L. Sanders.  Last updated February 8, 2007.