Spring 2007
ARM
CE 510 –ADVANCED GEOMATERIAL CHARACTERIZATION
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Topic |
Date |
Subtopics
(by lecture) |
Handouts |
Assigned |
|
Introduction |
1 |
Soils as a particulate material Continuum approximations |
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Stress at a point |
2 |
· Concept of Stress at a point · 2-D and 3-D Stresses · Stress axes in 2-D and Mohr circle ·Stress Paths |
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Soil Behavior at
the Microscale: Particle Forces, by Carlos Santamarina |
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3 Friday 1/19 |
· Stress Paths: laboratory and field stress paths |
Principal
Stresses and Mohr Circle (BM) 2-D and 3-D stresses (BM) |
Mayne and Kulhawy (1982).
“Ko – OCR relationships in soils”. |
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4 Wed 1/24 |
· Stress as a tensor: define tensor and review the definition of
stress and stress tensor · Review of paper by Santamarina. Effective stress |
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Effective Stress, from Soils
and Waves by Carlos Santamarina |
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5 Fri 1/26 |
· Stress invariants · 3-D representations of stress ● Ko
conditions: Review of paper by Mayne and Kulhawy |
|
Extract from Plasticity
for Structural Engineers, by Chen and Han (Chapter 2) On stress
invariants and Yield functions |
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Failure Criteria |
6 Mon 1/29 |
· Concept of Yield Function. Yield functions for metals · Yield functions for pressure-dependent materials · Brief discussion: Yield vs failure in soils |
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Strain at a |
7 Wed 1/31 |
(Finish failure criteria) ● Plane
Strain: the effect of the intermediate stress ● Strain at
a point and dilatancy angle |
Failure Criteria (BM) |
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Classical Soil Strength |
8 2/2 |
· Sources of
Shear resistance in coarse grained soils |
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9 2/12 |
· Strength
of Cohesive Soils ● Hvorslev surface |
·
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“Cohesive Soil: A dangerous
Oxymoron,” by Carlos Santamarina |
|
|
10 2/14 |
· Undrained
Strength · Normalized
strength parameters and the SHANSEP procedure |
·
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“Ladd and Foot: SHANSEP
procedure” |
|
|
11, 12 2/16 (Double Lecture day) |
· Discussion
of Ladd and Foot · Issues
with undrained strength of clay: Sampling, Creep strength loss, Anisotropy,
Sample size effects, effects of test type |
·
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Laboratory Testing |
13 2/23 |
● TX test |
·
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Saada and Townsend: State of the
art: laboratory strength testing of soils |
|
14 2/26 |
● Direct Shear and
Unconfined compression: why non-element tests are useful |
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15 2/28 |
● Simple Shear |
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16 3/2 |
● Dynamic Soil Properties
and Dynamic Testing |
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17 3/5 |
●
Finish Dynamic Testing of Soils |
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18 3/7 |
●
Exam Review |
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3/9 |
● EXAM |
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Topic |
Lecture # |
Subtopics
(by lecture) |
Handouts |
Assigned |
|
Critical State Soil Mechanics |
20 3/19 |
· Basic Plasticity
Models · Components of a
plasticity model: Elastic model, Yield Function, Hardening Function, Flow
Rule · Drucker’s
Stability postulate · Critical State
Concept · Stress and Strain
parameters · Experimental evidence
supporting the Critical State concept: Wood’s paper |
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21 3/21 |
●
Review of Exam · Critical state
framework |
|
Mohr
Coulomb error correction, by Andrew N Schofield |
|
|
22 3/23 |
· Stress dilatancy and
the derivation of the Cam Clay model ●
Compressibility of Clays |
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23 3/26 |
· Review of Cam
Clay model · Overview of
experimental data on yield functions (from Wood’s book) · Experimental
evidence of associativity in clays |
|
Fundamentals
of soil mechanics, Chapter 2. By D. M. Wood |
|
|
24 3/28 |
· Volumetric
hardening and plastic strains · Derivation of
Modified Cam Clay yield surface · Generalized
stress-strain model for Modified Cam Clay · Cam-Clay
prediction: triaxial tests in normally consolidated clays |
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25 3/30 |
· Cam-clay
predictions: triaxial tests in heavily overconsolidated clays · Predictions of
undrained strength and pore-pressure at failure |
|
Mayne
(1980). “Cam-Clay predictions of
Undrained strength,” Journal of the Geotechnical Engineering Division,
106(GT11), 1219-1241) |
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26 4/2 |
· Predictions of
undrained strength and pore-pressure at failure, slightly overconsolidated
soils · Prediction of Ko |
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27 4/4 |
· Heavily overconsolidated
soils and Hvorslev surface · Concept of state
boundary surface · Overview of
advantages and disadvantages of CC and MCC |
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28 4/6 |
· Determination of
MCC parameters ●
Index Testing and Critical State |
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29 4/9 |
· Regimes of soil
behavior |
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30 4/13 |
●
Problems with MCC and Critical State framework ●
Bounding Surface Plasticity |
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31 4/16 |
●
Nor Sand and MIT-S1: Critical State models for sands |
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32 4/18 |
EXAM |
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