GUIDE TO CONE PENETRATION TESTING
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GUIDE TO CONE
PENETRATION
TESTING
6th Edition 2015
Guide to
Cone Penetration Testing
for
Geotechnical Engineering
By
P. K. Robertson
and
K.L. Cabal (Robertson)
Gregg Drilling & Testing, Inc.
6th Edition
December 2014
Gregg Drilling & Testing, Inc.
Corporate Headquarters
2726 Walnut Avenue
Signal Hill, California 90755
Telephone:
Fax:
E-mail:
Website:
(562) 427-6899
(562) 427-3314
info@
The publisher and the author make no warranties or representations of any kind concerning the accuracy or
suitability of the information contained in this guide for any purpose and cannot accept any legal
responsibility for any errors or omissions that may have been made.
Copyright ? 2014 Gregg Drilling & Testing, Inc. All rights reserved.
TABLE OF CONTENTS
Glossary
i
Introduction
1
Risk Based Site Characterization
2
Role of the CPT
3
Cone Penetration Test (CPT)
6
Introduction
6
History
7
Test Equipment and Procedures
10
Additional Sensors/Modules
11
Pushing Equipment
12
Depth of Penetration
17
Test Procedures
17
Cone Design
20
CPT Interpretation
Soil Profiling and Soil Type
Equivalent SPT N60 Profiles
Soil Unit Weight (?)
Undrained Shear Strength (su)
Soil Sensitivity
Undrained Shear Strength Ratio (su/?'vo)
Stress History - Overconsolidation Ratio (OCR)
In-Situ Stress Ratio (Ko)
Relative Density (Dr)
State Parameter (?)
Friction Angle (?¡¯)
Stiffness and Modulus
Modulus from Shear Wave Velocity
Estimating Shear Wave Velocity from CPT
Identification of Unusual Soils Using the SCPT
Hydraulic Conductivity (k)
Consolidation Characteristics
Constrained Modulus
24
25
33
36
37
38
39
40
41
42
44
46
48
49
50
51
52
55
58
Applications of CPT Results
Shallow Foundation Design
Deep Foundation Design
Seismic Design - Liquefaction
Ground Improvement Compaction Control
Design of Wick or Sand Drains
59
60
83
96
121
124
Software
125
Main References
129
................
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