ENCI 523 Geotechnical Engineering II
Fall 2014
Dr J.A. Priest
Lecture Topics
1. Introduction/Overview
Geotechnical engineering and soil mechanics
Chapters
1,2,3,4,5,6,7 & 9
as covered in
ENCI 423
2. Shear Strength
Stresses in soi

foundations
Shear strength
ENCI 523 Geotechnical Engineering II
1
Learning outcomes
Understand limit equilibrium analysis
Calculate the safe bearing capacity of soils
Estimate the settlement of shallow foundations
Appreciate the stress and strain states i

Earth Retaining structures
Earth retaining structures
ENCI 523 Advanced Foundation Engineering
1
Applications
Earth retaining structures can be used in a wide
variety of applications:
Highway and road projects
Bridge abutments
Building sites on sloping gr

For the smooth wall where =0
v + h
R
2
sin = =
C v h
2
v 100
# +100 & v 100
2
0.5 =
0.5% v
(=
v +100
$
'
2
2
2
Rearranging in terms of v
0.5 ( v +100 ) = v 100 0.5 v = 150
v = 300
The angle of the plane through the pole
At h

Fluid flow and seepage analysis
Fluid flow and seepage
ENCI 523 Geotechnical Engineering II
1
Hydrostatic pore pressures
In geotechnical engineering there are 3 conditions for which we are interested
in calculating pore pressure.
1. Hydrostatic case No wa

We want to nd the stresses on a plane =135 to the horizontal
P
(400,231)
(n, )
R
= tan 1 (231 / 400) = 30 o
231
H=
= 462
o
sin 30
R = H * tan 30 o = 266.7
2
For a plane =135 to the horizontal, we can nd the p

ENCI 523
FINAL EXAM
Name: _
QUESTION 3 [35 marks]
A concrete retaining structure is to be constructed next to a water reservoir as shown in Figure 3 below.
The soil behind the wall consists of an upper layer of silt with 'cs 27.50 , underlain by a sand de

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ENCI 523
MIDTERM EXAM
N /
UCID
ENCI 523: Geotechnical Engineering II
Fall 2014
MIDTERM EXAM
Date: 17th October 2014
50 mins
ENE 241
Time: 10.00 AM 10.50 AM
Closed book
All types of calculators permitted
All answers must be contained in the exa

ENCI 523 Geotechnical Engineering II
Fall 2016
Laboratory No. 1 - Direct shear box test (Demo)
Objective: To determine the shear strength of sand using the direct shear box apparatus.
Introduction: Shear box apparatus will be presented in the lab and a ty

ENCI523GeotechnicalEngineeringII
Fall2012
Assignment1
(ShearStrength)
DueDate:October17,2012
ProblemstotryfromBudhutextbook:(NOTTOBEMARKED)
Probs.10.12;10.15;10.19;10.23.
MARKEDQUESTIONS
Question1
What are the various strength parameters measured in a CD

Slope stability
Slope stability
ENCI 523 Advanced Foundation Engineering
1
Infinite slope
Common problem we encounter are
1. Assess the stability of an existing slope, or
2. Design a safe slope
Lets consider long slopes at a constant angle : we can ideali

ENCI 523 - Soil Mechanics and Foundation Engineering
Laboratory No. 2
Unconfined Compression Tests
Cylindrical samples are prepared from the provided cohesive soil with varying degrees of
compaction effort or moisture content. Their cohesive strengths are

ENCI 523 Geotechnical Engineering II
Writing lab reports
Introduction
Laboratory reports are a key component of any laboratory investigation. It provides a
means of providing communication of the results of the investigation to those who
requested it or w

The University of Calgary
Department of Civil Engineering
ENCI 523 Geotechnical Engineering II
Assignment #1
Issue date: 26th September 2014
Due date: 3rd October 2014
Shear Box and Triaxial Tests Shear strength
1. The results of a shear box test on dr

The University of Calgary
Department of Civil Engineering
ENCI 523 Geotechnical Engineering II
Assignment #3
Issue date: 24th October 2014
Due date: 31st October 2014
Deep foundations
1. A column for a tall building is to be supported on a group of

The University of Calgary
Department of Civil Engineering
ENCI 523 Geotechnical Engineering II
Assignment #2
Issue date: 8th October 2014
Due date: 15th October 2014
Bearing Capacity
1. A proposed building is to be supported by a series of square footi

The University of Calgary
Department of Civil Engineering
ENCI 523 Geotechnical Engineering II
Assignment #1
Issue date: 26th September 2014
Due date: 3rd October 2014
Shear Box and Triaxial Tests Shear strength
1. The results of a shear box test on dr

Deep Foundations
Deep foundations
ENCI 523 Advanced Foundation Engineering
1
Deep foundations
ENCI 523 Advanced Foundation Engineering
2
Piles when, where and why
When do we use piles?
Upper soils are highly compressible and too weak too support
the load

ENCI 523 Tutorial
Deep Foundations
24th October
Question
A 12 m long precast concrete pile of square section with 400 mm a side is driven
into a medium stiff clay substratum that is normally consolidate (OCR = 1). The
undrained shear strength of the clay

ENCI 523 - Soil Mechanics and Foundation Engineering
Fall 2007
Laboratory No. 4
Model Footing Tests and Vane Shear Test
Objectives
(i)
(ii)
To investigate the behavior of a loaded model footing on clay for both a strip
footing and a circular footing, and

ENCI 523 - Soil Mechanics and Foundation Engineering
Fall 2007
Laboratory No. 5
Seepage Analysis Physical Model (graphical and numerical methods)
Objectives: To study seepage through a model dam and a model sheet-pile wall using both
graphical and numeric

ENCI 523 - Soil Mechanics and Foundation Engineering
Laboratory No. 3
Triaxial Compression Tests on Sand
The objective of this experiment is to determine the shear strength of sand in triaxial
compression conditions. The stress-strain response will be stu

ENCI 523 - Soil Mechanics and Foundation Engineering
Laboratory No. 1 - Direct shear box test (Demo)
Objective: To determine the shear strength of sand using the direct shear box apparatus.
Introduction: Shear box apparatus will be presented in the lab an