geotechnical innovations: from research to practice · geotechnical innovations: from research to...
TRANSCRIPT
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Geotechnical Innovations: From Research to Practice
Purdue Geotechnical Society Workshop
J. David Frost, Ph.D., P.E., P.Eng.Professor & Vice Provost
Georgia Institute of Technology
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Who knows what this is …..
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Outline of presentation• A few comments about innovation• In-situ penetration tests• Laboratory tests• Geosynthetics• Digital soils• Non-disruptive technologies• Full-scale tests• Insight inspired innovation• Emerging opportunities
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A Definition of Innovation:
The successful exploitation of a new idea, method, device or system that creates a
new dimension of performance…..
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Innovation Path (can be long and tortuous)
Basic Research
Applied Research
Translational Research
System Realization
Commercialization
Practice tends tofocus on this end…
Academia tends tofocus on this end…
Innovation Path (iPath)
Innovation can begin/occur anywhere along the path
Invention not same as Innovation!
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Innovation Characteristics
TYPES
• Transformational• Incremental• Device• System• Project specific• Method
METRICS
• Relative to what base• Cost to develop• Revenue generated• Return on investment• Simplicity
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Characteristics of Innovators
TRAITS
• Inquisitive mind• Willingness to explore• Not afraid to fail• Pioneer spirit• Enjoys working at
interfaces
WHO
• Individual• Group of individuals • Team• Owner• Thread of above
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Innovation Enablers/Detractors
SUPPORT FACTORS
• Situational• Constraint motivated• Insight inspired• Accidental• Environment driven
IMPEDIMENTS
• Resources• Ethics• Environment• Competitors• Constructability• Sustainability
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Cycle of Innovation
SURVIVABILITY
• One time event• Short life• Long life• Multiple incarnations
Rogers Diffusion “S” Curve
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Identified Geo-Innovations• Electronic data acq.• Data visualization• Numerical analysis• DEM• Osterberg Load Cell• System analysis• Geosynthetics• Ground improvement• Suction piles
• Real-time monitoring• Wave based char.• Probabilistic methods• Soil nailing• Penetration testing• Small strain • New materials• Higher resolution tools• Tomography
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In-Situ Penetration Tests
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Penetration Testing
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Vision Cone Penetrometer
(courtesy Hryciw)
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(courtesy Hryciw)
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Multi-sensor Technology
Conve
ntional 15 c
m2
CPT M
odule
Multi-
Fric
tion S
leev
e Pe
net
rom
eter
Att
achm
ent
qc
fs
fs#1
u2
fs#2
fs#3
fs#4
Attachment Digital HousingAttachment Digital Board
Digital Housing
Digital Board
Dual Axis Inclinometer
Friction Sleeve
Tip
Pore Pressure
61 c
m109 c
m
Friction Sleeve
Friction Sleeve
Friction Sleeve
Friction Sleeve
Mandrel
Mandrel
Mandrel
Mandrel
4.37 cm
Conve
ntional 15 c
m2
CPT M
odule
Multi-
Fric
tion S
leev
e Pe
net
rom
eter
Att
achm
ent
qc
fs
fs#1
u2
fs#2
fs#3
fs#4
Attachment Digital HousingAttachment Digital Board
Digital Housing
Digital Board
Dual Axis Inclinometer
Friction Sleeve
Tip
Pore Pressure
61 c
m109 c
m
Friction SleeveFriction Sleeve
Friction SleeveFriction Sleeve
Friction SleeveFriction Sleeve
Friction SleeveFriction Sleeve
MandrelMandrel
MandrelMandrel
MandrelMandrel
MandrelMandrel
4.37 cm
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Georgia Institute of Technology - Geosystems Group Multi Friction Sleeve CPT Attachment DataTest Site: Timian Yard - South Royalton, VT Oper: JD, GLH, DF MS #2: SM2 MS #5: N/ADate: Variable Tip Conf: 15cm2 CPT MS #3: Variable Pen. Rate (cm/s): 2Test ID: Variable MS #1: SM1 MS #4: SM4 Meas Rate (Sa/cm): 1Notes: Response of Sleeve Texture to Silica Sand at the SRVT test site - APF Corrected
0
1
2
3
4
5
6
7
8
9
10
11
12
13
0 5000 10000 15000
qT Tip Stress kPa)
Dep
th (m
)
0 200 400 600
Smooth Comp (kPa)
0 200 400 600
H0.125 Comp (kPa)0 200 400 600
H0.25 Comp (kPa)0 200 400 600
H0.50 Comp (kPa)0 200 400 600
H1.00 Comp (kPa)0 200 400 600
H2.00 Comp (kPa)0 200 400 600
ALL Sleeves (kPa)
Georgia Institute of Technology - Geosystems Group Multi Piezo Friction Sleeve CPT Attachment DataTest Site: Shenton Park Sand Site Oper: GLH, James, Andrew (Probedrill WA) MS #2: 30H.5S3 MS #5: N/ADate: Tip Conf: 15cm2 CPT MS #3: 30H1S3 Pen. Rate (cm/s): 2Test ID: MP30L0409C MS #1: 30H.25S3 MS #4: 30H2S3 Meas Rate (Sa/cm): 1Notes: MPFA - No fs, MS1 Page: 2 of 2
7/30/2004
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
0 10000 20000
Tip Stress (kPa)
Dep
th (m
)
-50 0 50 100Pore Pressure (kPa)
0 5 10
Sleeve Stress (kPa)-50 0 50 100
MP#0 (kPa)-50 0 50 100
MP#2 (kPa)
0 50 100
MP#3 (kPa)-50 0 50 100
MP#4 (kPa)-50 0 50 100
ALL MP (kPa)
-50 50
MP#1 (kPa)
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Integrated Digital Data Management
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Laboratory Tests
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Moist Tamping System
Schematic View of Moist Tamping System
Tamping Rod Reference Collar
Linear Bearing
Membrane Protection Collar
Load Cell
Tamping Disc
Vacuum Line
Split MoldRubber Membrane
Bottom Platen
Base of Frame
O-Ring
(a) (b)
4th Layer (Target Density)
7th Layer(+9%)
6th Layer(+6%)
5th Layer(+3%)
3rd Layer(-3%)
2nd Layer(-6%)
1st Layer(-9%)
Bottom Platen
Top Platen
Base of Frame
Membrane
O-Ring
Moist Tamped Specimen with Undercompation Ratio of 3 %
Base of Frame
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Forces Applied to MT Specimen
Forc
es, l
bs
Tamping Number
7th Layer
6th Layer
5th Layer
4th Layer
3rd Layer
2nd Layer
1st Layer
Cum
ulat
ive
Forc
es, l
bs
261.0
227.9
208.4
123.9
150.0
214.3
143.0
05
101520
05
101520
05
101520
05
101520
05
101520
05
101520
05
101520
0 10 20 30 40 50 60 70 80 90 100
0 10 20 30 40 50 60 70 80 90 100
0 10 20 30 40 50 60 70 80 90 100
0 10 20 30 40 50 60 70 80 90 100
0 10 20 30 40 50 60 70 80 90 100
0 10 20 30 40 50 60 70 80 90 100
0 10 20 30 40 50 60 70 80 90 100
0
100
200
300
0
100
200
300
0
100
200
300
0
100
200
300
0
100
200
300
0
100
200
300
0
100
200
300
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Peak Stress Measurement
Avg. Peak Stress,kPa
Laye
r
0
1
2
3
4
5
6
7
0 50 100 150 200
10%25%40%50%75%
Top
Bottom
10 25 40 50% 75% ← Target DR
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Global Response of Dilatant Specimens
0
50
100
150
200
250
300
0 2 4 6 8 10 12 14 16 18 20Axial Strain, %
Dev
iato
r Stre
ss q
', kP
a
H/D=1, Non-lubricated
H/D=1, Thin Lubricated
H/D=1, Thick Lubricated
H/D=2, Non-lubricated
50 kPa confining pressure
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Typical GeomaterialsSteel FRP
Wood Concrete
Geomembranes
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Interface Shear Device (End View)
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Curved Shear BoxCurved Shear Box
Shear Box on Top of Pipe Coupon Photograph of the Underside of the Shear Box
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Geosynthetics
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Geosynthetics
(courtesy Hebeler)
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Geosynthetics
(courtesy Hebeler)
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Geosynthetics
(courtesy Hebeler)
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Geosynthetics
(courtesy Hebeler)
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Digital Soils
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Tomography & Imaging Technologies
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Serial Sectioning and Image Capture
Polishing Off 8μ Capturing Images
Reference Marks for Alignment
Cone for Removal Check
MultiPrep System Leica DM 4000Illustration of Reference Marks
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Mosaic Generation
Image 101 Image 102
Image 201 Image 202
Four Neighboring Images with 20% Overlap
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3-D Reconstruction
20 mm
12 mm8 μ600 slices ≈
5 mm
Slice used in 3D reconstruction Dimensions of the Reconstructed Volume
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Reconstructed Ottawa 50-70 Block
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3-D Reconstructed Specimens
Sub-volume of a specimen Extracted Pore Structure Extracted Particles
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3-D Analysis: Pore Structure
Colors represent relative distance (red - close, blue -far) to the nearest particle surface. (Particles are not shown)
Medial Axis Analysis:
•Shortest Paths
•Tortuosities
A Volume of 256x256x 300
3D Medial Axis of the Volume
= +
Medial Axis Paths from Face 1 to Face 2 All Medial Axis Paths Shortest Paths
Face 1
Face 2
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3-D Particle Visualization
Back
Top Bottom Right
Front
Left
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3-D Pore Visualization
Volume size: 117 x 87 x 65 voxels
Estimated pore size:
Length = 600 ~ 700 micron
Width = 200 ~ 300 micron
Height = 400 ~ 500 micron
(i) (ii) (iii)
(iv) (v) (vi)
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• Surface Texture, roundness and sphericity influence strength properties and deformation characteristics of granular materials.
• There are few experimental studies that link strength properties and instability phenomena of unbound granular materials to their micro-properties.
Influence of particle surface toughness on friction and dilatancy angle under Plane strain Loading
(courtesy Al-Shibli)
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Particle Shape Modeling in DEM
Ellipses/EllipsoidsTing, Ng, Lin, others
SuperquadraticsWilliams et al.
PolygonsGhaboussi, Williams
Bonded ClustersJensen, Bray, O’Sullivan
Overlapping ClustersAshmawy, Sukumaran
(courtesy Sukumaran)
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Non-disruptive Technologies
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Machines
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Jacking ForcesJFtotal = JFface pressure + JFfriction
JFfriction
JFface pressure
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Intermediate Jacking Stations
• For Pipelines 36-inch and Larger
• Long Lead Time Items
• Must be inserted at Proper Location or they are useless
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No Lube – Lube – No Lube – Lube – No Lube
0
20
40
60
80
100
120
140
0 50 100 150 200 250 300 350
Length [feet]
Jack
ing
Forc
e [to
ns]
Actual Jacking Forces Predicted Lubricated
6.0int =μ μint.effective =0.35μint.lube =0.06 μint.lube =0.06
Non-LubricatedLubrication Begins LubricationBegins Non-Lubricated
μint.effective =0.5
0
20
40
60
80
100
120
140
0 50 100 150 200 250 300 350
Length [feet]
Jack
ing
Forc
e [to
ns]
Actual Jacking Forces Predicted Lubricated
6.0int =μ μint.effective =0.35μint.lube =0.06 μint.lube =0.06
Non-LubricatedLubrication Begins LubricationBegins Non-Lubricated
μint.effective =0.5
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Full-scale Man-induced and Natural Tests
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Osterberg Load Cell
(courtesy LoadTest)
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D. Fratta
Bridge in Biloxi – Post KatrinaHurricane Storm Surge
(courtesy Santamarina)
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BiloxiD’Iverville
I-110 Bridge
Pile 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Bathymetry: 200 kHz
Sub bottom profiling: 20 kHz
Hurricane Storm Surge
D. Fratta
(courtesy Santamarina)
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Insight Inspired
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Shearing MechanismsOttawa 20-30 Sand Specimen with Dyed Sand Layers
Structure Preservation After Shearing: Phenolic Resin (1% by weight)
Confining Stress = 50 kPa
Rod/Sleeve Displacement = 67.5 mmDyed Sand Layers
Specimen
Rod & Sleeve
Membrane
Chamber
End Cap
Rubber Seal
Dial Gage
Sle
eve
Rod
Sand
Displacement System w/ Worm Gear Motor
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Shearing MechanismsUnaffected
Zone
Smooth SleeveDirection of Sleeve Displacement
Unaffected Zone
Shear Zone
Diamond SleeveDirection of Sleeve Displacement
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Discrete Element Modeling
Random Cluster Generation
Consolidation Shearing
N N
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Discrete Element Modeling
Avg. Part. Horiz. Disp. (mm)0 2 4 6 8 10
Laye
r
02468
101214
Horizontal Disp. (mm)0 2 4 6 8 10
Top
Wal
l Dis
p. (m
m)
0.0
0.3
0.6
0.9
1.2
Avg. Part. Rotation (Deg.)0 1 2
Laye
r
02468
101214
Horizontal Disp. (mm)0 2 4 6 8 10
She
ar S
tress
(kP
a)
0.0
50.0
100.0
150.0
Normal Force
Displacement
• Smooth Surfaceμp-p = 0.4μp-c = 0.3
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Normal Force
Displacement
Discrete Element Modeling
Avg. Part. Horiz. Disp. (mm)0 2 4 6 8 10
Laye
r
02468
101214
Horizontal Disp. (mm)0 2 4 6 8 10
Top
Wal
l Dis
p. (m
m)
0.0
0.3
0.6
0.9
1.2
Avg. Part. Rotation (Deg.)0 1 2
Laye
r
02468
101214
Horizontal Disp. (mm)0 2 4 6 8 10
She
ar S
tress
(kP
a)
0.0
50.0
100.0
150.0
• Textured Surfaceμp-p = 0.4μp-c = 0.3
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Emerging Opportunities
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Gas Hydrate Bearing Sediments
Kvenvolden and Lorenson, 2001
(courtesy Santamarina)
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-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
2 4 6 8Resistance [kΩ ]
Dep
th [c
m]
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
2 4 6 8Resistance [kΩ]
Dep
th [c
m]
PhotographX-Ray
Varved Clay
Spatial Variability: Electrical Needle Probe
(courtesy Santamarina)
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In-Vivo Optical Molecular Imaging
The Kodak In-Vivo MultispectralImaging System FX locates andmonitors changes in molecular activity of specific cells and organslong before morphological changescan be detected…….
Editors Choice – Bioscience Technology March Innovations.
(courtesy Kodak)
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12
3
16
15
14
13
12
11
1098
7
6
5
4
12
3
16
15
14
13
12
11
1098
7
6
5
4
Resistivity Tomography ERT
high σ
V
23
4
5
67
8
V
V
V
V
V
V
V
116
9
1514
13
1211
10
12
3
16
15
14
13
12
11
109
8
7
6
5
4
low σ
(courtesy Santamarina)
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Shear Wave Imaging – Stress around tunnels
Vs (m/s)
35
50
65
80
95
110
>125
(courtesy Santamarina)
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Next Generation...
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Thank You.
(courtesy Hebeler)