ACKNOWLEDGEMENT 
This study is being conducted in cooperation with 
Professor E. J. Cording, of the Department of Civil 
Engineering at the University of Illinois at Urbana- 
Champaign, as a part of a study on tunnel design and 
construction which is being supported by the U.S. De- 
partment of Transportation. All the soil tests on the 
tunnel models are being conducted under the direction 
of Professor Cording. Mr P Lenzini, a graduate student 
in Civil Engineering, played a major role in the de- 
sign of the tunnel model; and Mr S.W. Hong, a graduate 
research assistant, is currently responsible for con- 
ducting the tests and for analysis of the gauge 
measurements. 
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23 
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