Department of Earth Science |Northeastern Illinois University

INTRODUCTION TO GEOTECHNICAL ENGINEERING
ESCI 340
Spring, 2007

Review for Exam #1  (February 6, 2007)                                                                                  Dr. Sanders

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

* Respond appropriately to the list of skills in What should you bring to this course?

* Be ready to answer "Questions and Practice Problems", p. 32-33:  Problems 2.1, 2.2, 2.3, 2.4, 2.5, and
"Comprehensive Questions and Practice Problems", p. 45:  Problem 2.13.

* List the eight common rock-forming minerals mentioned in your textbook and describe their properties and general chemical composition. 

    (feldspars, quartz, ferromagnesian minerals, iron oxides, calcite, dolomite, mica, and gypsum)

* Describe hand samples of the common rock-forming minerals; give mineral names where appropriate.

* Suggest why some of the specific properties of these minerals might be of importance to a geotechnical engineer.

* Describe the importance of discontinuities (bedding planes, schistocity, folds, joints, and fractures in engineering analysis).

* Name and give concise definitions of the three major classes of rocks.  For each one, list subgroups and describe their formation and important characteristics. 


* Examining hand samples of various types of rocks, construct reasonable hypotheses as to how they formed; classify them according to your hypotheses.

* Suggest why some of the specific properties of these rocks might be of importance to a geotechnical engineer.

<>* Describe the importance of discontinuities (bedding planes, schistocity, joints, and fractures) in engineering analysis.

<>* Considering the different goals and objectives of geologists and engineers, write definitions of "soil", "sediment", and "rock" that would be suitable for each group.
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* Describe the characteristics of six different environments of soil formation mentioned in the textbook on pages 33-43, including their engineering properties
  (residual, glacial, alluvial, lacustrine, aeolian, and colluvial soils).

* Explain why an understanding the engineering properties of soil and rock would be useful in common projects such as building of, say, a parking garage or roadway.

* Answer "Questions and Practice Problems", p. 32-33:  Problems 2.1, 2.2, 2.3, 2.4, and 2.5.
 
* Answer "Comprehensive Questions and Practice Problems", p. 45:  Problems 2.13 through 2.19.  In answering the problems, discuss the following information:
            --Location of the study site
            --Sketch of a geologic cross section, plan view map, or other representation of the important geological aspects of the situation.
            --A brief summary of the question/problem posed
            --Your response
            --Any further geologic considerations that might be important.

* List the three phases of soils.

* Explain the difference between volume, mass, and weight of the three phases of soils.

* Explain how to measure moisture content in the laboratory. 

* Report, compare, and analyze the results of the soil moisture determination.

* Explain what the following quantities reveal about a soil, and using a soil phase diagram, define each one:

    q moisture content (w)
 q
porosity (n)


  q density (r):
                s  density of the soil sample
                s  dry density
                s  density of water
  q specific gravity of solids (Gs)  

* Using the mass of a dry soil sample, estimate the volume of solids by using density of the mineral content.
 
* Given a mass of water in a sample, use the density of water to estimate the volume of water.

Department of Earth Science | Northeastern Illinois University

© 2007 Laura L. Sanders.  Last updated February 2, 2007.