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Title:Rapid shear strength evaluation of in situ granular materials utilizing the dynamic cone penetrometer
Author(s):Ayers, Michael Eugene
Doctoral Committee Chair(s):Berger, Richard P.
Department / Program:Civil and Environmental Engineering
Discipline:Civil and Environmental Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Engineering, Civil
Engineering, Materials Science
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.
Issue Date:1990
Rights Information:Copyright 1990 Ayers, Michael Eugene
Date Available in IDEALS:2011-05-07
Identifier in Online Catalog:AAI9114169
OCLC Identifier:(UMI)AAI9114169

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