Enhanced In-Situ Geotechnical Testing Geotechnical Engineering Short Course – 1.4 CEUs 2 days: Thursday and Friday: 11 – 12 May 2017

Enhanced In-Situ Geotechnical Testing

Georgia Tech – Global Learning Center, Fifth & Spring Street, Atlanta GA

¨     GT GLC at Tech Square:  84 Fifth Street NW, Atlanta, Georgia  30308
¨     Georgia Tech Professional Education – Online Registration: www.pe.gatech.edu
¨     Registration opens at 07:30 a.m. (includes breakfast both days).
¨     Class Sessions both days from 08:00 a.m. to 5:00 p.m.
¨      Continuous Break – Food & Drink Refreshments of all sorts all day long.
¨      Hard copy color notes of module sections
¨    Free DVD electronic version of notes and reference materials, including PDF manuals, technical papers, reports, and books written and/or co-authored by the instructor.
¨      Instructor:  Professor Paul W. Mayne, PhD, P.E.

Online Registration:  www.pe.gatech.edu


The course provides an overview on the types of in-situ geotechnical tests (SPT, CPT, CPTu, DMT, PMT, VST) and geophysical methods (Refraction, CHT, DHT, SASW, CSW, MASW, PSW, and ReMi), and places special emphasis on the utilization of the expedient SCPTù (and related SDMTà) for efficient collection of site-specific data for geotechnical investigations. Up to five independent readings on soil response are collected in a single sounding, in particular, the cone tip stress (qt), sleeve friction (fs), porewater pressure (u2), time rate dissipations (t50), and downhole shear wave velocity (Vs).  Interpretative methods are reviewed for obtaining a suite of soil parameters & properties often required in geotechnical analyses, especially numerical modelling simulations. The importance and usefulness of the small-strain shear modulus (Gmax), obtained from shear wave velocities, is documented as an initial state parameter, representing the beginning of all stress-strain-strength curves (drained, undrained, static, dynamic). Numerous case studies are interwoven to show the general applicability of the approaches in soil behavior, as well as applications to full-scale foundation response. The use of Gmax in shallow and deep foundation performance is demonstrated, specifically in the derivation of nonlinear load-displacement-capacity evaluations, as well as approximate nonlinear stress-strain-strength curves for input into numerical simulations (FEM).  Methods of indirect and direct capacity assessment by CPT are contained in the documents.


Geotechnical engineers, offshore designers, site planners, foundation designers, tract developers, structural, civil, and construction engineers involved with building sites, foundation systems, land construction, numerical analyses, and real estate development should attend this course. The use of modern methods for assessing soil parameters for shallow & deep foundation systems from in-situ test data. Students will receive a full set of hard copy notes, plus a free DVD with the notes and affiliated documents, including the NHI Manual on Subsurface Investigations (2002), FHWA Evaluation of Soil & Rock Properties (2002), and NCHRP (2007) Synthesis 368 on Cone Penetration Testing, as well as separate NSF, ADSC, and ARO reports on related topics.

COURSE OUTLINE – 2 day event – Selected Topics Covered

01 – In-Situ Testing Introduction

·        Drilling and Sampling

·        Overview of various in-situ tests, including:

o    Standard Penetration Testing (SPT)

o    Vane Shear Test (VST)

o    Flat Plate Dilatometer Test (DMT)

o    Pressuremeter Test ( PMT)

o    Cone Penetration (CPT)

o    Piezocone (CPTu)

02 – Geophysical Methods

·     Mechanical waves (compression P-, shear S-, Rayleigh R-waves)

·     Methods for measurement by in-situ geophysics, including:

·    Refraction (RF), Crosshole (CHT), Downhole (DHT), Surface Waves (SASW), and direct push methods (SCPT and SDMT)

·   Electromagnetic Waves: ground penetrating radar (GPR), surface resisitivity and electrical conductivity, electromagnetic conductivity (EM), magnetometer.

03 – Effective Friction Angle from In-Situ Tests

·    Drained Penetration – clean quartz sands using relative density, cavity expansion, limit plasticity, and direct methods.

·     Case Study – west campus – Georgia Tech

·     Undrained Effective Penetration Method (NTH Method)

·      Case Studies:  Sandpoint – Idaho;  Newbury – Massachusetts, Belfast – Ireland

Northwestern University – Illinois, Washington, DC.

04 – Critical State Soil Mechanics for Dummies

·      Overview on CSSM in simplified terms

·      Link between Shear strength and consolidation

·       Supporting lab and oedometer data

05 – Profiling OCR in Clays by CPTU and DMT

·       Cavity Expansion-Critical State Formulation

·       Type 1 and 2 piezocones

·       Calibrations with laboratory chamber tests

·        Field case studies

·        Approach for flat plate dilatometer

06 – First-Order Preconsolidation  from In-Situ Tests

·         Approximate methods for evaluating Pc’ from in-situ tests

·         Cone, Piezocone, Dilatometer, Vane, Pressuremeter, and Vs

·         Case studies:   1. Port of Anchorage, Alaska; 2.  Sandpoint, Idaho

·         Review of CPT chamber tests on sands (706)

·         New generalized CPT approach for sands, silts, and clays

o   (Presented at 2014 ASCE GeoCongress)

07 – Undrained Shear Strength

·         Characteristic Mode

·          Strength Anisotropy

·          Critical State Soil Mechanics (CSSM)

·         Sampling Disturbance Effects on Lab Results

·          Case Study – Troll Offshore Site, North Sea

·          Case study – Cooper Marl, Charleston, SC

08 – Evaluation of Ko in Soils

·          General Ko-OCR relationships in Soils

·           CPT Calibration Chamber database method for quartzitic sands

·           Case study applications

09 – Permeability & Time Rate: Piezo-Dissipation Tests

§  Monotonic Porewater Pressure Decays

§  Strain Path Solution

§  Dilatory Response

§  Piezodissipation testing at the “dark chocolate” clay

Canadian Geotechnical Test Site 1, Gloucester, Ontario

10 – Piedmont Residual Soils

·       Nontextbook Geomaterials

·       Opelika National Geotechnical Experimentation Site, Alabama

11 – Stiffness and Equivalent Elastic Soil Modulus

·        Strain and stress-level dependency

·        Foundation displacements evaluated by elastic continuum solutions

·         Case study: Dorm B mat settlements evaluated by DMT

12 – Nonlinear Stress-Strain-Strength of Soils

·        Approximate nonlinear stress-strain-strength evaluations from SCPT

·        Case studies for clay test sites

·        Case studies for undisturbed sands sampled by freezing methods

13 – Nonlinear Footing Response

·       Hybrid limit plasticity-elastic solutions for load-displacement capacity

·        Class “A” and “C” Predictions – Case Studies at TAMU, Bothkennar, Belfast

·        Direct CPT method for shallow footings based on full-scale load tests

14 – Axial Pile Response from SCPTu

·    Direct vs Indirect (rational) CPT Methods for Capacity

·    Elastic Continuum Framework for Displacements

·    Applications to Osterberg Load Cell

·    Selection of Case Studies from the following:

1.      Amherst NGES soft clay, Massachusetts

2.      Texas A&M NGES College Station

3.      Opelika NGES, Alabama

4.      I-85 Drilled Shaft Foundation, Coweta County, Georgia

5.      GT Campus, Atlanta, GA

6.      Southern Companies, Jackson County, GA

7.      GDOT Viaduct O-Cell in Piedmont Residuum at CNN, Atlanta

8.      Foothills Medical Center (O-Cell), Calgary, Alberta

9.      Arthur Ravenel Bridge, Charleston, SC

10.  Golden Ears Bridge, Vancouver (O-Cell).

11.  Large driven open pipe at Euripides site, Holland

12.  The 2009 Michael W. O’Neill Lecture (CIGMAT, Houston)

15 – Future Directions & Research

· ·   Upcoming advances in field testing and in-situ test devices:

a.  T-bar

b.  PROD (offshore robotics)

c.  ball penetrometers

d.  RotoAutoSeis

e.  Frequent-interval shear wave profiling (FiSDMT)

f.  Continuous shear wave profiling (CiSCPTu)

g.   Clustering (geostatistics)

h.   ShearPro (program to reduce downhole data by cross-correlation)

i.   Twitch testing (rate effects and delineation of drained-semi-drained-undrained response)

and other improvements in field procedures and data processing are discussed.


CPT’14 – KEYNOTE 3rd Intl. Symposium cone penetration testing, Las Vegas (May 2014): www.cpt14.com

ISC5 Keynote:  Total and effective stress strength of soft clays from CPTu and DMT (Sept 2017), Australia

Online Registration:  www.pe.gatech.edu

Direct Link:   https://pe.gatech.edu/courses/enhanced-situ-testing-for-geotechnical-analyses-and-foundation-design

Course ID CIVE 2001p

DLPE:  Phone: 404.385.3500 and 3555

Distance Learning & Professional Education

Contact Representatives:

Catherine Shaw:   catherine.shaw@pe.gatech.edu

Chris Walker:   chris.walker@pe.gatech.edu

Respectfully yours


Paul W. Mayne, PhD, P.E.
Professor- Geosystems Engineering
School of Civil & Environmental Engineering
Georgia Institute of Technology
790 Atlantic Drive
Mason Building Room 2245
Atlanta, GA 30332-0355
Office Phone: 404-894-6226
Email: paul.mayne@ce.gatech.edu