of Earth Science |Northeastern
TO GEOTECHNICAL ENGINEERING
Review for Exam
#2 (March 15,
By the end of
today's class, you should be able to do the following:
* (DELETED) Solve
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
|F (HINT: what is the mass of the gas phase of a soil?)
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 degree of
weight of the soil sample (g)
weight of water (gw)
s dry unit
s density of the soil
s density of water
q specific gravity of
q void ratio (e)
q relative density
* (DELETED) Answer
Practice Problems 4.1-4.3 (p. 113), 4.6 and 4.7 (p.114).
(DELETED) Explain how to derive Equations 4.27, 4.29, and 4.30 in the
on p. 107.
(DELETED) Homework for Thursday: as a group (groups assigned in class)
to derive Equation 4.28.
Determination and Analysis of Grain Size and Plasticity
* Show how to perform the sieve test portion
of a grain size
distribution analysis (presentation
by Maureen and Evelyn).
* Explain how to use the hydrometer
method to determine the grain size
distribution of the fine portion of a soil sample (presentation by Rob
J and Rob B).
* Explain the use of the term
Results; Grain Size Distribution Graphs
Looking at a grain
size distribution graph, differentiate between
sediment samples that are poorly graded
and those that are well
* Using a grain size distribution graph, read off the D10, D30,
and D60, and calculate
of uniformity (Cu).
* Construct grain size distribution curves for the sample analyses
distributed in class, and those reported
in Problem 4.12 on p. 124.
the meaning of the engineering term "fines" as it applies to grain
and describe the difference between silt and clay.
* Explain the difference between soil in a liquid, solid, and
* Explain what the Atterberg limits
of a soil tell us.
* Show how to determine the liquid
limit, plastic limit,
and plasticity index of a
soil sample in the laboratory.
* Use the ASTM Visual Manual procedure to investigate and
characteristics of a soil sample (presentation
by Krys and Hossein).
* Use the USDA texture triangle to classify a soil sample.
* Use the
USCS classification system to classify a soil on the basis of
lab tests. (Presentation
* Use the AASHTO classification system to classify a soil sample.
* Describe the standard methods for characterizing a site in
its geotechnical aspects. (Presentation
by Matt and Dustin.)
of Earth Science | Northeastern
© 2007 Laura L. Sanders. Last updated
March 8, 2007.