GUIDE TO CONE PENETRATION TESTING

SBT)

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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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