Rapid shear strength evaluation of in situ granular materials utilizing the dynamic cone penetrometer
Ayers, Michael Eugene
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https://hdl.handle.net/2142/20018
Description
Title
Rapid shear strength evaluation of in situ granular materials utilizing the dynamic cone penetrometer
Author(s)
Ayers, Michael Eugene
Issue Date
1990
Doctoral Committee Chair(s)
Berger, Richard P.
Department of Study
Civil and Environmental Engineering
Discipline
Civil and Environmental Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Civil
Engineering, Materials Science
Language
eng
Abstract
"Determination of the in situ shear strength of granular materials is an expensive and time consuming endeavor using traditional ""detailed"" evaluation techniques. The development of several ""rapid"" evaluation devices has facilitated the determination of the in situ shear strength of fine-grained soils. However, there were no ""rapid"" evaluation devices suitable for characterizing the in situ shear strength of granular materials."
"One of the most versatile ""rapid"" evaluation devices is the Dynamic Cone Penetrometer (DCP). The DCP can be used to evaluate a wide range of material types including granular materials with a maximum aggregate size of approximately 2-inches. Existing correlations relating DCP test results to unconfined compressive strength and CBR are available for a range of material types. However, there were no existing correlations to shear strength. This study focused on the determination of correlation equations relating DCP test results to the shear strength of various granular materials."
The material types evaluated include: sand, gravel, crushed gravel, crushed dolomitic ballast, and crushed ballast with the inclusion of non-plastic fines. DCP and rapid shear triaxial tests were performed on laboratory molded specimens. The effect of density, gradation, confining pressure, overburden, and other material and test parameters were evaluated. General and material specific correlation equations were developed.
"The DCP is a viable alternative to traditional ""detailed"" evaluation procedures. The DCP has a wide range of applications including: relative density determination, compaction control, determination of the strength characteristics of fine-grained and granular materials, location of potential problem areas during initial site investigation, and numerous other uses relating to design and construction of civil engineering projects. The correlations developed in this study facilitate implementation of DCP test results in ""state of the art"" design and analysis procedures."
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