The Hong Kong University of Science and Technology
CIVL 3730

Fall 2014
Dear Users,
Welcome to the Online Soil Lab. This lab was created to help you have better understandings on Soil
Mechanics through different kinds of visual aids, such as numerical simulations, animations and video
clips. There are eight different parts in
The Hong Kong University of Science and Technology
CIVL 3730

Fall 2014
Homework #1
Due Date: Sep 23. Please submit your homework at the beginning of tutorial hour.
Tutorial hour: Sep 23 (Friday; for two sessions)
You only need to submit Q2 and Q3
Q1.
Please review the part of Basic Geology. You can also use the materials in
The Hong Kong University of Science and Technology
CIVL 3730

Fall 2014
e,tL, 't. M"J, ,
Due date: Oct. l 28
Tutorial hour: Oct.
28
3H'" f. /1rtYw, ,
( ~,j"<t)
4.2' A series of drained triaxial tests was carried out on specimens of a
sand prepared at the same porosity and the following results were
obtained at failure. Determ
The Hong Kong University of Science and Technology
CIVL 3730

Spring 2015
CIVL3510 Hydrosystems Engineering
Chapter 9
Chapter 9 Pumps and PumpPipe Systems
PUMPS AND PIPE SYSTEMS
Pump: A mechanical system that gives energy
Turbine: A mechanical system that extracts energy.
EGL
h1
B
Z2
HGL
Z1
A
Datum
2
B
HP
Z2
1
EGL
Z1
A
HGL
Pum
The Hong Kong University of Science and Technology
CIVL 3730

Spring 2015
CIVL3510 Hydrosystems Engineering
6
HYDROLOGIC DESIGN
6.1
Chapter 6 Hydrologic Design
HYDROLOGIC DESIGN SCALE
Hydrologic design is the process to assess the impact relating to hydrologic events on a water
resource system and to determine the key variables
The Hong Kong University of Science and Technology
CIVL 3730

Spring 2015
CIVL3510 Hydrosystems Engineering
Chapter 7
7
Fundamental Laws of Hydraulics
7.1
Substantial Derivative in Fluid Mechanics
Fluid mechanics usually deal with properties that change in space and time. Differentials of
multivariable functions must be conside
The Hong Kong University of Science and Technology
CIVL 3730

Spring 2015
Tutorial 10
Question 1
The flow rate in a long and straight trapezoidal channel is 80 m 3/s. The bottom width of the channel
is 15m, and the side slope is 1:1 (H:V). The channel bed slope is 0.0002. The Manning roughness
coefficient of the channel is 0.01
The Hong Kong University of Science and Technology
CIVL 3730

Spring 2015
Short Answers to Tutorials 5 to 8
Tutorial 5
Q.1
(a)
h (Q 1 + Q 3 Q 2)
=
t
D 2/ 4
.
(b)
V 2 =4.125 m / s .
Q.2
R x =1,765.8 kN
closed
R x =501,000 N =501 kN <
open
Rx
closed
Tutorial 6
Q.1
Hydraulic output power pump =Q H p ;
H p =17.8m
h L =12.34m
Q.2
H
The Hong Kong University of Science and Technology
CIVL 3730

Spring 2015
CIVL3510 Hydrosystems Engineering
5
HYDROLOGIC ROUTING
5.1
Chapter 5 Hydrologic Routing
HYDROGRAPH
Hydrograph is a continuous graph giving the information of the change of streamflow (Q) with
time (t). It gives a representation of flow for a particular st
The Hong Kong University of Science and Technology
CIVL 3730

Fall 2014
Dear Users,
Welcome to the Online Soil Lab. This lab was created to help you have better understandings on Soil
Mechanics through different kinds of visual aids, such as numerical simulations, animations and video
clips. There are eight different parts in
The Hong Kong University of Science and Technology
CIVL 3730

Fall 2014
Hong Kong University of Science and Technology
Department of Civil and Environmental Engineering
The dwarf sees further than the giant when he has the giant's
Isaac Newton
shoulder to mount on.
Rubric
CIVL 3730
Title of course
Fundamentals of Geotechnics
The Hong Kong University of Science and Technology
CIVL 3730

Fall 2014
Homework #5
1.
The following parameters are known for a saturated normally consolidated clay: N = 2.6,
= 0.14, = 2.45 and cs = 30. The specimen is consolidated under an isotropic pressure of
400 kPa before the axial compression is applied to shear the sp
The Hong Kong University of Science and Technology
CIVL 3730

Fall 2014
HW #7 Solutions
(1) Given Cc=0.4, Cr=0.08, OCR=4.5, vo=130kPa
Assume Gs=2.7, initial void ratio e0=wGs=0.28x2.7=0.756
Maximum past effective stress, vc=OCR x v0
=4.5x130=585kPa
Final effective stress vf=v0+=130+150=280kPa<vc
So H =
=
=0.03m
If OCR=1.5, vc
The Hong Kong University of Science and Technology
CIVL 3730

Fall 2014
Final exam: 09/12/14 (Wednesday), 16:30~19:30 pm, Venue: LG4
Review of the final exam:
Contents:
1. The principle of effective stress (You must know how to calculate the effective stress)
2. Introduction to site investigation and field tests
3. A critical
The Hong Kong University of Science and Technology
CIVL 3730

Fall 2014
Homework #1
Due Date: Sep 23.
Tutorial hour: Sep 28 (Monday) and Oct. 1 (Thursday)
You only need to submit Q2 and Q3
Q1.
Please review the part of Basic Geology. You can also use the materials in the following
website to enhance your understanding.
Hong K
The Hong Kong University of Science and Technology
CIVL 3730

Fall 2014
CIVL 3730 Fundamentals of Geotechnics Outline and Review
Midterm exam
Date:
October, 30 (Friday)
Time:
7:00 pm ~ 9:30 pm (7:45 ~ 10:15 pm*)
Room: LTA (LTD*)
*For those who need to attend the Lab session.
Exam types: Close book
1. Please bring a calculato
The Hong Kong University of Science and Technology
CIVL 3730

Fall 2014
1. Take Plane XX as the reference plane for elevation head.
Case (1):
Total head at Point A: HA = 5m
Total head at Point B: HB = 3m
HA HB Water flows from point A to B, downward seepage.
Hydraulic gradient:
53
=
= 0.5
=
4
Consider the soil above plane
The Hong Kong University of Science and Technology
CIVL 3730

Fall 2014
4.2 Solution
Sand is cohesionless, and therefore c = 0; assuming pore water pressure uw = 0
because it is a drained test. Plot the Mohrcircle in the  space. When the Mohrcircle touches the failure envelope, the soil fails.
Failure envelop
= 'tan' + c'
The Hong Kong University of Science and Technology
CIVL 3730

Fall 2014
Q2.
A soil has a total (bulk) density of 1.91 Mg/m3 and a water content of 9.5%. The value of
Gs is 2.7. Calculate the void ratio and degree of saturation of the soil. What would be the
values of density and water content if the soil were fully saturated