The Hong Kong University of Science and Technology
Geotechnical Analysis and Design
CIVL 3740

Spring 2016
CIVL 3740  Geotechnical Analysis and Design
Chapter 2
Design of retaining walls
Chao ZHOU
2. 2 Gravity & cantilever concrete
walls
Simplifications and approximations
Das (2012)
Vertical plane AB; Rankine active earth pressure
The weight of the soil ab
The Hong Kong University of Science and Technology
Geotechnical Analysis and Design
CIVL 3740

Spring 2016
Chapter 2
Design of retaining walls 1
Instructor: Chao ZHOU
Tutor: Damilola Bashir Akinniyi
CIVL 3740 Geotechnical Analysis and Design
1
Short question 1
What are the common types of retaining walls?
Gravity and cantilever concrete walls
Cantilever shee
The Hong Kong University of Science and Technology
Geotechnical Analysis and Design
CIVL 3740

Spring 2016
You will need:
Pen
Paper
Calculator
Brain
Note:
This PPT will be
uploaded to Canvas
later
Tutorials #5 & #6
CIVL 3740 GEOT ECHNICA L A NA LYSIS A ND D ESIGN
Instructo r: Chao ZHOU
Tuto r:
Geo rge GOOD WIN
CIVL 3740 TUTORIALS #5 & #6
1
Part
The Hong Kong University of Science and Technology
Geotechnical Analysis and Design
CIVL 3740

Spring 2016
CIVL 3740
Tutorial 10: Deep foundation
Name: CHEN, Yaohui
Email: [email protected]
Vertically loaded single pile in
uniform clay
End bearing capacity in clay (u=0)
Gross end bearing capacity per unit area
(Meyerhofs method):
qb N c*cu N q*q
Net end b
The Hong Kong University of Science and Technology
Geotechnical Analysis and Design
CIVL 3740

Spring 2016
CIVL 3740
Tutorial 9: Shallow Foundation
and Deep foundation
Name: CHEN, Yaohui
Email: [email protected]
Shallow Foundations
Types of foundation settlement
Uniform stress
distribution
Flexible
foundation
Nonuniform settlement
distribution
Nonunifor
The Hong Kong University of Science and Technology
Geotechnical Analysis and Design
CIVL 3740

Spring 2016
CIVL 3740
Tutorial 8: Shallow Foundations (Part 2)
Name: Fong Kin Yew
Email: [email protected]
Terzaghis Bearing Capacity Theory
Terzaghis bearing capacity equation (applicable for strip footing):
For circular footing:
For square footing:
For re
The Hong Kong University of Science and Technology
Geotechnical Analysis and Design
CIVL 3740

Spring 2016
CIVL 3740  Geotechnical Analysis and Design
Chapter 4
Shallow foundations
Chao ZHOU
Three failure modes of shallow foundations
(a) General shear failure likely on
dense sand or stiff clay
(b) Local shear failure likely on
medium dense sand or medium clay
The Hong Kong University of Science and Technology
Geotechnical Analysis and Design
CIVL 3740

Spring 2016
CIVL3740 Geotechnical analysis and design
Tutorial  5
Instructor: Prof. ZHOU Chao
Tutor: MA Qijie
Topics
When can a vertical cut stay stable without lateral support?
Soil arching.
Lateral earth pressure and determination of the strut loads
(lecture notes
The Hong Kong University of Science and Technology
Geotechnical Analysis and Design
CIVL 3740

Spring 2016
Chapter 2
Design of retaining walls 2
Instructor: Chao ZHOU
Tutor: Damilola Bashir Akinniyi
CIVL 3740 Geotechnical Analysis and Design
Question 1
Which area are the anchored or propped sheet pile
extensively used and why?
2
Question 2
What are the two bas
The Hong Kong University of Science and Technology
Geotechnical Analysis and Design
CIVL 3740

Spring 2016
CIVL 3740  Geotechnical Analysis and Design
Chapter 1 Lateral Earth Pressure
Chao ZHOU
Active earth pressure
c ' tan
From the geometric relationship,
D
E
O
3
C
1
Rearrange,
1 sin
1 sin
h
v 2c
1 sin
1 sin
The horizontal stress must
be the minor pr
The Hong Kong University of Science and Technology
Geotechnical Analysis and Design
CIVL 3740

Spring 2016
CIVL 3740  Geotechnical Analysis and Design
Chapter 2
Design of retaining walls
Chao ZHOU
2. 5 Pore pressure distribution
behind retaining wall
Why do we need to know pore water distribution?
No water flow
Water pressure diagram equal:
balance out
Wi
The Hong Kong University of Science and Technology
Geotechnical Analysis and Design
CIVL 3740

Spring 2016
Chapter 1
Lateral Earth
Pressure
CIVL 3740 GEOTECHNICAL ANALYSIS AND DESIGN
TUTORIAL #2
1
1/3
Example 1
Knappett and Craig (2012)
Draw the Rankine active earth pressure diagram for the retaining wall. Determine the
magnitude and line of action of the res
The Hong Kong University of Science and Technology
Geotechnical Analysis and Design
CIVL 3740

Spring 2016
CIVL 3740  Geotechnical Analysis and Design
Chapter 3
Braced Cuts or
Multipropped Excavations
Chao ZHOU
Soil arching
Terzaghi (1943) stated that
If one part of the support of a soil mass yields
while the remaining stays in place, the soil
adjoining the
The Hong Kong University of Science and Technology
Geotechnical Analysis and Design
CIVL 3740

Spring 2016
CIVL 3740  Geotechnical Analysis and Design
Chapter 3
Braced Cuts or
Multipropped Excavations
Chao ZHOU
3. 6 Ground settlement outside the
excavation
(serviceability limit state)
Ground movement outside the excavation
vm
A. Horizontal ground movement
h
The Hong Kong University of Science and Technology
Geotechnical Analysis and Design
CIVL 3740

Spring 2016
CIVL 3740
Tutorial 11: Deep Foundation and Slope stability
Instructor: Prof. ZHOU Chao
TA :
BUI, Duc Tung
Mail: [email protected]
DEEP FOUNDATION
2
I. Negative Skin Friction (NSF)
Recalled terminologies and mechanisms
Shear stress from soil to pile ac
The Hong Kong University of Science and Technology
Geotechnical Analysis and Design
CIVL 3740

Spring 2016
CIVL 3740  Geotechnical Analysis and Design
Chapter 5
Deep foundations
Chao ZHOU
Types of pile group
Type 1:
Piled raft  the cap is in contact with
the ground, as in most cases
Das (2004)
Type 2:
Free standing  the cap well above the
ground, as in off
The Hong Kong University of Science and Technology
Geotechnical Analysis and Design
CIVL 3740

Spring 2016
Given paramters
From
0.0 m
Surcharge load 20 Kpa
c
From
sat
16 kN/m3
0
32
1.5 m
to
1.5
m
K0
1sin()
0.47
to
K0
4.0
m
20 kN/m3
1sin()
c
0
0.47
32
Effective lateral earth pressure distribution
'v
Depth
0.0 m
'h
Depth
1.5 m
'v
20.00 kPa
9.40 kPa
20.00
24.00
The Hong Kong University of Science and Technology
Geotechnical Analysis and Design
CIVL 3740

Spring 2016
CIVL 3740 Assignment 3 (Due date: 1st April)
Q1: A braced excavation is shown in Fig. 1. The struts are located at 2m center to center on plan
(i.e. along the length of the excavation). Draw the earth pressure envelopes and determine the
strut loads at le
The Hong Kong University of Science and Technology
Geotechnical Analysis and Design
CIVL 3740

Spring 2016
CIVL 3740Assignment 1
(100 marks in total)
Q1 (40 marks): Refer to the following figure, given H = 4m, H1 = 1.5m, q = 20 kPa, = 16 kN/m3,
sat = 20 kN/m3, c = 0, = 32: (a) Determine the lateral earth pressure distribution, the atrest
lateral earth force
The Hong Kong University of Science and Technology
Geotechnical Analysis and Design
CIVL 3740

Spring 2016
CIVL 3740Assignment 2
(100 marks in total)
Q1: Details of a reinforced concrete cantilever retaining wall are shown in Fig. 1. The unit
weight of concrete is 24kN/m3. Due to the inadequate drainage, the water table rose to the level
indicated, while the
The Hong Kong University of Science and Technology
Geotechnical Analysis and Design
CIVL 3740

Spring 2016
CIVL 3740  Geotechnical Analysis and Design
Chapter 1 Lateral Earth Pressure
Chao ZHOU
What are the Design Limit States?
1. Ultimate limit state  prevent catastrophic collapse
2. Serviceability limit state  serviceable
Drying Case
Wetting Case
Evaporat