Advanced Geotechnical Methods in Exploration (The A-GaME) Tools for Enhanced, Effective Site Characterization
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1 Advanced Geotechnical Methods in Exploration (The A-GaME) Tools for Enhanced, Effective Site Characterization
2 Topics Every Day Counts (EDC) The A-GaME Overview Featured Methods Summary of Benefits
3 What is Every Day Counts (EDC)? State-based model to identify and rapidly deploy proven but underutilized innovations to: shorten the project delivery process enhance roadway safety reduce congestion improve environmental sustainability EDC Rounds: two year cycles Initiating 5 th Round ( ) - 10 innovations To date: 4 Rounds, over 40 innovations For more information: FAST Act, Sec.1444
4 Implementation Planning Team Practitioners l Geotechnical l Construction l Design l Risk l Geophysics l Site Variability l Public and Private Sectors l Industry Representation ADSC, AEG, DFI, EEGS, GI and AASHTO COBS, COC, COMP Brian Collins FHWA-WFL Derrick Dasenbrock MNDOT Mohammed Elias FHWA-EFL Vaughan Griffiths Mines Peggy Haggerty Duffy ADSC Khamis Haramy FHWA-CFL David Horhota FLDOT Jim Hussin Keller Foundations Mary Ellen Large DFI Brian Lawrence FHWA-ME Div. Erik Loehr Univ. of Missouri Michelle Mann NMDOT Marc Mastronardi -GDOT Mike McVay Univ. of Florida Silas Nichols FHWA HQ Mary Nodine GEI Consultants Bill Owen Caltrans Krystle Pelham NHDOT Jeff Reid Hager-Richter Ben Rivers FHWA-RC Brent Rosenblad Univ. of Missouri Phil Sirles Olson Engineering
5 Mission Mitigate risks to project schedule and budget, and improve reliability by optimizing geotechnical site characterization using proven, effective exploration methods and practices.
6 Risk Source: FHWA
7 Risk Source: Florida DOT Source: Florida DOT
8 Benefit of Upfront Investment in Site Investigation Source: NCHRP Synthesis Influence of Geotechnical Investigation and Subsurface Conditions on Claims, Change Orders, and Overruns (After Figure 1)
9 MODOT Approach for Relating Design Reliability to Variability. Example Shown: Tip resistance shafts in clay Resistance Factor for End Bearing, qp Bridges on Minor Roads Bridges on Major Roads Major Bridges (<$100 million) Major Bridges (>$100 million) COV of Mean Undrained Shear Strength, COV su Source: Missouri DOT
10 Spatial Variability and Design Reliability Center for Accelerating Innovation From FDOT GS-DEEP
11 Preliminary Planning LiDAR Courtesy of BGC Engineering and BC Hydro
12 LiDAR Overlay - Kentucky Center for Accelerating Innovation
13 LiDAR, Mapped Landslides, Geologic Units - Kentucky
14 Center for Accelerating Innovation Karst Potential, Mapped Features - Kentucky
15 Featured Geotechnical Exploration Methods Cone Penetration Test (CPT/SCPT) Electrical Methods (ER, IP, SP) Seismic Methods (Refraction, Surface Waves, FWI, Tomography, Reflection) Measurement While Drilling (MWD) Optical and Acoustic Televiewers (OTV/ATV)
16 Mainstream Effective Underutilized Methods Cone Penetration Testing (CPTu/SCPTu) More reliable parameters than from conventional SPT Small strata changes easily discernable Pore-water pressure measurements Shear-wave measurements with SCPTu 3-10 times faster than conventional drilling Source: FHWA
17 Mainstream Effective Underutilized Methods Electrical Methods (ER, IP, SP) Discern contrasting materials and groundwater conditions over large areas Clay, Silts, Sands/Gravel, Voids, Groundwater, geologic features Source: FHWA-CFL
18 c0 4 T- 3 Miller Creek Resistivity North T- 2 T- 1 Source: Minnesota DOT
19 all borings are offset 3.5 m to the west of the ERI line c0 4 T- 3 Miller Creek Resistivity North T- 2 T- 1 Sand & gravel w/possible riprap Silty Soils Silty Soils Sand & gravel or possible utility sands sand & gravel sandy to silty N Source: Minnesota DOT
20 Electrical Resistivity 2D Profiles in 3D Space Courtesy of Jeff Reid, Hager-Richter Assoc.
21 Mainstream Effective Underutilized Methods Seismic Methods (Surface Waves, Refraction, FWI, Downhole, Reflection) Indicates stratigraphic changes and boundaries over large areas Load-displacement behavior Seismic hazard susceptibility Courtesy of Jeff Reid, Hager-Richter Assoc.
22 GRM/Tomo Overlays - Seismic NW SE 5630 GRM V 1 = 370 m/s (1200 f/s) 5580 GRM V 2 = 770 m/s (2525 f/s) Elevation (feet) 5530 GRM V 3 = 1270 m/s (4170 f/s) Velocity Distance (feet) Source: Owen, Caltrans, 2018
23 Courtesy of Jeff Reid, Hager-Richter Assoc.
24 Measurement While Drilling (MWD) - Background AKA Diagraphy Drilling, Instrumented Drilling, Use of Drilling Parameters Predominantly used with rotary-percussive, airrotary and rotary-wash drilling ACIP Piles - Use many of the same drilling measurements Often used in conjunction with LWD Logging While Drilling (down-hole geophysics) in the Oil/Gas/Mining Industries.
25 Background - Measurements Measured and Recorded while Drilling: Fluid Pressure Torque Rotation Speed Thrust-on-bit (i.e. Down-thrust, Down- Pressure, Crowd) Hold-Back Penetration Depth Time Drilling-Speed (reciprocal of time)
26 Measurement While Drilling (MWD) Continuous profile Discernable stratigraphic and material changes Rock or Soil Standardized in Europe ISO Source: FHWA
27 From Rodgers et al. (Ongoing), McVay et al. 2016
28 From McVay et al Estimated strengths from field MWD Monitoring Strengths and unconfined compressive strengths from core specimens.
29 From McVay et al. 2016
30 MWD - QA Monitoring Drilling Efficiency From Rodgers et al. (On-Going)
31 Center for Accelerating Innovation Downhole Televiewers Televiewers Optical and Acoustic (OTV/ATV) High-resolution, 360o, GIS, spatially oriented rock drillhole images Continuous In-place rock structure and condition Eliminates difficult oriented coring Independent of core quality Courtesy of Jeff Reid, Hager-Richter Assoc.
32 Projected unwrapped Courtesy of Jeff Reid, Hager-Richter Assoc.
33 Projected unwrapped Courtesy of Jeff Reid, Hager-Richter Assoc.
34 Center for Accelerating Innovation Courtesy of Jeff Reid, Hager-Richter Assoc.
35 Benefits of Bringing Your A-GaME Reduced Risk. Reducing uncertainties in subsurface conditions mitigates design and construction risks. Improved Quality. Improving confidence in the geotechnical characterization reduces unnecessary conservatism in design and establishes a more reliable basis for design and construction of foundations and other geotechnical features impacting the highway system. Accelerated Project Delivery. Since a significant number of construction delays can be attributed to inadequate knowledge of subsurface site conditions, well-scoped investigation programs improve decision-making and constructability, providing time and cost savings for transportation agencies.
36 Get Your A-GaME on! /geotech_methods.cfm Or Search FHWA EDC
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