geotechnical site characterization
TRANSCRIPT
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
Laboratory Testing Analysis and Design
Construction ObservationField Exploration
Geotechnical Engineering
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
Geotechnical Site Characterization
Data MiningMethodsConsulting
Characterizeand Report
Field Exploration Laboratory Testing
5 Steps of …
Geotechnical Site Characterization
1 2MethodsConsulting
DataMining 3Field
Explorations 4LaboratoryTesting 5Characterize
and Report
STEP 1 – DATA MINING
Valuable Historic Data
Activated for Useful Access
1 2MethodsConsulting
DataMining 3Field
Explorations 4LaboratoryTesting 5Characterize
and Report
STEP 1 – DATA MINING
Valuable Historic Data
Activated for Useful Access
1 2MethodsConsulting
DataMining 3Field
Explorations 4LaboratoryTesting 5Characterize
and Report
STEP 1 – DATA MINING
Enhanced with GIS Information
Valuable Historic Data
Activated for Useful Access
1 2MethodsConsulting
DataMining 3Field
Explorations 4LaboratoryTesting 5Characterize
and Report
STEP 1 – DATA MINING
Enhanced with GIS Information
Allows Characterization & Preliminary Evaluation
1 2MethodsConsulting
DataMining 3Field
Explorations 4LaboratoryTesting 5Characterize
and Report
STEP 1 – DATA MINING
WHAT ARE THE EXPECTED GEOTECHNICAL CONDITIONS?
PRACTICAL SOLUTIONS
1 2MethodsConsulting
DataMining 3Field
Explorations 4LaboratoryTesting 5Characterize
and Report
STEP 2 – METHODS CONSULTING
Geotechnical Engineers
Geologists
In‐Situ Testing
Laboratory Testing
Geophysicists
Drillers Work Planning Options Sequence Interaction
Geotechnical Site Characterization
Geotechnical Site Characterization
1 2MethodsConsulting
DataMining 3Field
Explorations 4LaboratoryTesting 5Characterize
and Report
STEP 3 – FIELD EXPLORATION
In-Situ Testing
Geophysical
1 2MethodsConsulting
DataMining 3Field
Explorations 4LaboratoryTesting 5Characterize
and Report
STEP 3 – FIELD EXPLORATION
Geotechnical Site Characterization
Drill/Sample
1 2MethodsConsulting
DataMining 3Field
Explorations 4LaboratoryTesting 5Characterize
and Report
STEP 3 – FIELD EXPLORATION
Geotechnical Site Characterization
1 2MethodsConsulting
DataMining 3Field
Explorations 4LaboratoryTesting 5Characterize
and Report
STEP 3 – FIELD EXPLORATION
Geotechnical Site Characterization
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
1 2MethodsConsulting
DataMining 3Field
Explorations 4LaboratoryTesting 5Characterize
and Report
STEP 3 – FIELD EXPLORATION
Geotechnical Site Characterization
Standard Penetration Test
Geotechnical Site Characterization
1DataMining 2Methods
Consulting 3FieldExplorations 4Laboratory
Testing 5Characterizeand Report
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…
1 2MethodsConsulting
DataMining 3Field
Explorations 4LaboratoryTesting 5Characterize
and Report
STEP 3 – FIELD EXPLORATION
Geotechnical Site Characterization
Geotechnical Site Characterization I The Essential Start to Every Project
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
Geotechnical Site Characterization I The Essential Start to Every Project
Cone Penetration Testing
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.
Geotechnical Site Characterization I The Essential Start to Every Project
High Plasticity ClaysLow Plasticity Clays
Silts and Sandy Silts
Sands
1DataMining 2Methods
Consulting 3FieldExplorations 4Laboratory
Testing 5Characterizeand Report
Geotechnical Site Characterization
Geophysical Services
Electrical Resistivity Tomography (2D and 3D)Induced Polarization and Spontaneous Potential
Wenner 4-pin to 1000’ A-spacingsFall of Potential
Resistivity
1 2MethodsConsulting
DataMining 3Field
Explorations 4LaboratoryTesting 5Characterize
and Report
STEP 4 – LABORATORY TESTING
Geotechnical Site Characterization
1 2MethodsConsulting
DataMining 3Field
Explorations 4LaboratoryTesting 5Characterize
and Report
STEP 4 – LABORATORY TESTING
Geotechnical Site Characterization
East
North Central
South Central
WestLaboratory Capabilities
LaboratoryResource Centers
Accrediting Agency Laboratories Accredited
AASTHO 65
US Army Corps of Engrs 43
1 2MethodsConsulting
DataMining 3Field
Explorations 4LaboratoryTesting 5Characterize
and Report
STEP 5 – CHARACTERIZE AND REPORT
Terracon (Data) Field Laboratory
Client Directives Information
Geotechnical Site Characterization
Vibrant Collaboration
42 511 2MethodsConsulting
DataMining 3Field
Explorations 4LaboratoryTesting 5Characterize
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
Explorations 4LaboratoryTesting 5Characterize
and Report
GEOTECHNICAL SITE CHARACTERIZATION SERVICES
1DataMining 2Methods
Consulting 5Characterizeand Report3Field
Explorations 4LaboratoryTesting
Geotechnical Site Characterization