subsurface investigations and the of the field...subsurface investigations and the role of the...
TRANSCRIPT
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Subsurface Investigations and the Role of the Geotechnical Field
ProfessionalA Look at the Requirements, Methods, Product, Problems and Solutions for Field Investigations Performed for
NCDOT Projects
Presenters: Christina Bruinsma, LGCheryl Youngblood, LG, CPG
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The Issue
• With the increase of private sector contracting work from other NCDOT branches (i.e. Rail) and additional in house investigations, the NCDOT GEOTECHNICAL Unit is striving to create concise, consistent and efficientmethods for geotechnical subsurface investigations of all kinds.
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Key Goal
• Field Professionals working on all aspects of a NCDOT Geotechnical investigation should understand the scope of work for each project, and strive to convey each site in a detailed and accurate manner, in order to make all involved aware of critical geological and geotechnical concerns and conditions.
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Requirements of Field Professional
Site Observation
Geomorphology
Structural Geology
Anthropological and Environmental Concerns
Surface Hydrology
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Geomorphology
• Stream ChannelMorphology
• Natural andEngineeredSlopes
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Surficial Hydrology
• Ponds/lakes• streamflow
• Wetlands• Seeps/Springs
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Anthropological and Environmental Concerns
• Artificial Fills• Construction Debris• Contamination• Vegetation & Wildlife
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Structural Geology
• Rock Orientationin Slopes
• Critical geologicmapping
• Correlate exposed rock to subsurface sampling
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Various Field Investigation Methods
• SPT and power augerdrilling
• Coring• Hand augers (alluvial mapping)
• Bridge rod soundings• Geophysical testing(GPR, resistivity, CPT)
• Installation of wells• slope indicators
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Requirements of Field Professional
Subsurface Investigation
Detailed Reporting(field logs)
Subsurface Hydrology
Understanding soil and rock origins and depositional environments
Understanding and Classifying Soils
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Detailed Reporting
Field logsSurveying
Problem solvingMapping
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Soil Classification
• AASHTO classification
• Identifying highly plastic soils
• Identifying other problematic soil conditions
Photo Credit J. Howard, AMEC
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Rock – Origin, Classification, Descriptions
• Rock Classification
23.3
24.7
29.7
33.1
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Subsurface Hydrology• Understanding perched water tables• Making accurate observations of water conditions in critical sites, particularly roadways and problematic slopes.
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Understanding the Relationship Between Field Observation and Final
Product
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GEU Reporting Methods and NCDOT Legend
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Field Log to gINT Log
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Field Observation and Understanding Stratigraphy
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The Solution
• Making sure qualified geologists and engineers are involved and trained to observe and communicate issues effectively.
• Create a field professional manual that details NCDOT methods, processes and key observation points.
• A training program to certify qualified professionals in NCDOT Geotechnical methods for subsurface investigations.
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Questions and Comments
Your input is very important as we work to make investigation and reporting more efficient!