Geotechnical Site Characterization

The to Every Project

GeotechnicalSite Characterization

1DataMining 2Methods

Consulting 3FieldExplorations 4Laboratory

Testing 5Characterizeand Report

EssentialStart

Site Characterization I The Essential Start to Every Project

Geotechnical Site Characterization

GEOHAZARDS• Landslide•Rockfall•Underground Mine Subsidence•Karst Subsidence

Site Characterization I The Essential Start to Every Project

… in that order

Laboratory Testing Analysis and Design

Construction ObservationField Exploration

Geotechnical Engineering

Geotechnical Site

Characterization

Laboratory Testing

Field Exploration


Differing Subsurface Conditions

Differing Subsurface Conditions

Angle of Internal Friction,

3 1d

Cohesion, c

Piles Shafts Auger Micro

GroundImprovement

Geotechnical Site

Characterization

Laboratory Testing

Field Exploration

Geotechnical Site Characterization I The Essential Start to Every Project

Field Exploration

LaboratoryTesting1 2 53 4Field

ExplorationsLaboratoryTesting

Geotechnical Site Characterization Field Exploration Laboratory Testing

4 Segments of Geotechnical Engineering

FieldExplorations

LaboratoryTesting1 2 53 4Field

ExplorationsLaboratoryTesting


Data MiningMethodsConsulting

Characterizeand Report

Field Exploration Laboratory Testing

5 Steps of …


1 2MethodsConsulting

DataMining 3Field

Explorations 4LaboratoryTesting 5Characterize

and Report

STEP 1 – DATA MINING

Valuable Historic Data

Activated for Useful Access


DataMining 3Field


and Report





DataMining 3Field


and Report


Enhanced with GIS Information




DataMining 3Field


and Report


Enhanced with GIS Information

Allows Characterization & Preliminary Evaluation


DataMining 3Field


and Report


WHAT ARE THE EXPECTED GEOTECHNICAL CONDITIONS?

PRACTICAL SOLUTIONS


DataMining 3Field


and Report

STEP 2 – METHODS CONSULTING

Geotechnical Engineers

Geologists

In‐Situ Testing

Laboratory Testing

Geophysicists

Drillers Work Planning Options Sequence Interaction




DataMining 3Field


and Report

STEP 3 – FIELD EXPLORATION

In-Situ Testing

Geophysical


DataMining 3Field


and Report



Drill/Sample


DataMining 3Field


and Report




DataMining 3Field


and Report



East

North Central

South Central

West

Drilling Only

Drill and CPT

Rigs Exist Planned

Acker 0 2

Mini‐Rig 3 0

CME 46 4

Deidrick 22 3

Geoprobe 6 2

CPT 2 1

Mobile 1 0

Pigani 3 0

Simco 1 0

111

2

12

13

2

43

3

1 1 1

73

31

2

7

1

1

12

1

1

1

112

243

2

7

91

1

7

CPT Only

(Number indicates number of units )

Current Exploration Capabilities

1

1

Exploration Resource Centers


DataMining 3Field


and Report



Standard Penetration Test





The tried and proven” test Around for 100+ years In-situ Test (N value) but yields disturbed sample Intended for granular deposits (where sampling is difficult) Overused but state of the practice…


DataMining 3Field


and Report




Cone Penetration Testing



A 10 sq cm (1.4 in. dia.) probe with a 60O conical tip is pushed into the soil at a rate of 2 cm/sec (4 ft/min)

Tip Resistance, qc

SleeveResistance, fsPore Pressure, u

Continuous data collection transmitted real-time on site.

Tip and sleeve Load CellsPore pressure Transducer



Data are transmitted directly to an on-site computer for immediate interpretation.

Using empirical correlations of the tip and sleeve resistance and pore water pressure data estimates of many soil parameters can be developed.

A few examples include: Undrained Shear Strength (of cohesive soils) Friction Angle (of cohesionless soils) Overconsolidation Ratio Hydraulic Conductivity

Empirical correlations are also used to predict soil behavior type.The following slide illustrates this process.


High Plasticity ClaysLow Plasticity Clays

Silts and Sandy Silts

Sands






Geophysical Services

Seismic Refraction, Reflection, MASW, ReMi, Downhole/Crosshole


Ground-Penetrating Radar (GPR)Time/Frequency Domain Electromagnetic

Magnetics


Electrical Resistivity Tomography (2D and 3D)Induced Polarization and Spontaneous Potential

Wenner 4-pin to 1000’ A-spacingsFall of Potential

Resistivity


DataMining 3Field


and Report

STEP 4 – LABORATORY TESTING



DataMining 3Field


and Report

STEP 4 – LABORATORY TESTING


East

North Central

South Central

WestLaboratory Capabilities

LaboratoryResource Centers

Accrediting Agency Laboratories Accredited

AASTHO 65

US Army Corps of Engrs 43


DataMining 3Field


and Report

STEP 5 – CHARACTERIZE AND REPORT

Terracon (Data) Field Laboratory

Client Directives Information


Vibrant Collaboration

42 511 2MethodsConsulting

DataMining 3Field


and Report

Geotechnical Engineers

Geologists

In‐Situ Testing

Laboratory Testing

Geophysicists

Drillers

Drill/Sample

In-Situ Testing

Geophysical

GEOTECHNICAL SITE CHARACTERIZATION SERVICES

42 511 2MethodsConsulting

DataMining 3Field


and Report

GEOTECHNICAL SITE CHARACTERIZATION SERVICES


Consulting 5Characterizeand Report3Field

Explorations 4LaboratoryTesting



Laboratory TestingField Exploration



Consulting 5Characterizeand Report3Field

Explorations 4LaboratoryTesting

Analysis and DesignConstruction Observation

ComprehensiveGeotechnical Consulting

Geotechnical Site Characterization

Documents