AEG 2017 Finances & 2018 Budget › assets › Webinars › Applied... · 2020-05-20 · APPLIED...
Transcript of AEG 2017 Finances & 2018 Budget › assets › Webinars › Applied... · 2020-05-20 · APPLIED...
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APPLIED GEOLOGY IS AN“ESSENTIAL” PROFESSION
David F. Fenster
2019-2020 AEG Past President
Chicago Chapter – May 19, 2020
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OUTLINE
•Your Geologic Toolkit
•Critical & non-critical facilities
•Site Characterization and the “Geologic”
Content of Nuclear License Applications
•Case Studies
•Conclusions
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Poll Question 1
•Are you a member of AEG?
–Full Member
–Student Member
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GEO TOOLKIT
•Geologic education
•Sound fundamentals
•Enhance your toolkit - “on the job”
•Get out of your comfort zone
•Sharpen communication skills
•Never stop learning!!!
•Licensing
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Poll Question 2
•Are you a licensed professional
–Geologist
–Engineer
–Other
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“CRITICAL FACILITIES”
•Important to health and safety
•Important to the environment
•Nuclear Facilities
– Power plants, waste repositories
•Non-nuclear Facilities
–Dams, bridges, tunnels, schools, hospitals
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Locations of Operating Reactors
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License Application
•Safety Analysis Report
–2.5.1.1 Regional Geology
–2.5.1.2 Site Geology
–2.5.2 Vibratory Ground Motion
–2.5.3 Surface Deformation
•Environmental Report
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Site Characterization
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Geology
•Physiography & Geomorphic Processes
–Emphasis on Quaternary Processes
•Stratigraphy
•Geologic History
•Structural Geology & Tectonic Processes
–Integrates geologic history & tectonics
•Engineering Geology
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Unit 1 of V.C Summer
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Federal Court House
•Forensic Investigation
•Foundation Failure
–Used nuclear facility QA procedures
–Early phase used 3 boreholes
–Geotechnical Data Interpretation
•Sampling plan
•Site data
–Geologic interpretation of multiple borings
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Interpretation – 3 Boreholes
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Meandering River
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Interpretation – Meandering Stream
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Solutions - independent of interpretation
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Where Did the Paint Go?
•ILGS
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The Paint Stopped Here!
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National Institute of Health
•Maryland Piedmont
•4 geotechnical investigations
•4 interpretations of site geology
–2 types of schist
–Wissahickon Schist – “implication of weak rock”
–Granite or diorite
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Wissahickon Formation
•No longer mapped in MD
•Type section in Philadelphia
•Easily excavated near surface (saprolite)
•Excavation bid document
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Wissahickon Fm.
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Igneous Rocks with Flow Foliation
•Granite •Rhyolite
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Investigation in Karst Terrain
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Karst – Varied Depths
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Valley & Ridge Geology
•Folded & Thrust Faulted Sedimentary Units
•Variations in dip directions
•Assumptions regarding Vs
•Implications for Design
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Geologic Map in Oak Ridge Area
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Cross Section near Oak Ridge
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Lake Needwood Dam – MD Piedmont
• A ‘High Hazard’ dam;
• Earthen flood-control structure for Upper Rock Creek watershed;
• Storage capacity of the 75-acre reservoir - 196 million gallons;
• Designed to discharge 100-yr flood waters through the 42” diameter
principal spillway over 10-days, reducing flooding risks downstream;
• Zoned embankment has clay-core;
• Cut-off trench (12’-20’ wide) located 20’ upstream from centerline
down into weathered rocks – schist & gneiss in the foundation.
• Thanks to Visty Dalal – MDE Dam Safety Division
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Foundation Preparation
• In 1965, single line grout curtain was constructed ONLY
on the right abutment and below a portion on right side
of the dam based on the soundness of rock in a single
boring located in the valley bottom;
•Therefore, as per the 1962 reports, only 1/3 of the valley
bottom was grouted before the dam was constructed.
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Extreme Rain Event
•June 26, 2006 - heavy rains (~9 inches) resulted
in a 23-foot rise in water level in the lake.
•June 28, 2006 – dam staff observed
uncontrolled, concentrated seepage emanating
from left abutment/embankment area (300
GPM), along with soil particles. This had
significant potential for “piping failure”.
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Seepage After Extreme Rain Event
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Potential Causes for Seepage
•Fracture flow through foundation rock;
•Flow through abutments;
•Flow through rock/embankment contact;
•Flow through embankment defects;
•Ineffectiveness of downstream blanket drain;
and
•Flow over the core in the dam
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Lake Needwood Lessons
•Total repair cost to the new owner - $3 million.
•Dam hasn’t had any problems since 2008 and is now
actively monitored.
•Every dam project should have an engineering geologist
involved with site characterization, design & construction
•Some cost-saving measures today can lead to higher
costs in the future.
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Conclusions
•Rigorous geologic investigations are fun
•Research informs our concepts
•Continue to learn and expand your
experience
• Never stop learning
•Applying geologic knowledge is necessary
for critical facilities
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Never
too
young
to start!
Any ?