Slope failures can occur in different modes such as falls, topples, slides, spreads, and flows. Slides are further classified into rotational, translational, and complex composite types. Slope stability analysis involves calculating the factor of safety (Fs) which is the ratio of shear strength to shear stress developed along the potential failure surface. An Fs greater than 1.5 indicates stable conditions. Methods for analyzing slope stability include infinite slope analysis, finite slope analysis using plane or circular failure surfaces, and modern methods using soil properties and the method of slices. Computer programs are commonly used to perform detailed slope stability evaluations.
Class notes of Geotechnical Engineering course I used to teach at UET Lahore. Feel free to download the slide show.
Anyone looking to modify these files and use them for their own teaching purposes can contact me directly to get hold of editable version.
Class notes of Geotechnical Engineering course I used to teach at UET Lahore. Feel free to download the slide show.
Anyone looking to modify these files and use them for their own teaching purposes can contact me directly to get hold of editable version.
Methods to Determine the Immediate or Elastic Settlement (الهبوط الفورى)BahadarKhan8
In this lecture I have Described the different methods to compute the immediate settlement in soils.
The methods described are Janbu & Bjerrum Method, Schmertmann's Method and Timoshinko & Goodier Method.
To watch videos please use the links below:
https://youtu.be/HULeW5TbyNw
https://youtu.be/8r0xfRoydk8
https://youtu.be/XplqYVOhPwg
Class notes of Geotechnical Engineering course I used to teach at UET Lahore. Feel free to download the slide show.
Anyone looking to modify these files and use them for their own teaching purposes can contact me directly to get hold of editable version.
Class notes of Geotechnical Engineering course I used to teach at UET Lahore. Feel free to download the slide show.
Anyone looking to modify these files and use them for their own teaching purposes can contact me directly to get hold of editable version.
Methods to Determine the Immediate or Elastic Settlement (الهبوط الفورى)BahadarKhan8
In this lecture I have Described the different methods to compute the immediate settlement in soils.
The methods described are Janbu & Bjerrum Method, Schmertmann's Method and Timoshinko & Goodier Method.
To watch videos please use the links below:
https://youtu.be/HULeW5TbyNw
https://youtu.be/8r0xfRoydk8
https://youtu.be/XplqYVOhPwg
Class notes of Geotechnical Engineering course I used to teach at UET Lahore. Feel free to download the slide show.
Anyone looking to modify these files and use them for their own teaching purposes can contact me directly to get hold of editable version.
This slide will help you to determine the immediate settlement for flexible foundation i.e. isolate footing and rigid foundation i.e. matt or raft foundation. To be more clear about the topic a numerical problem with the solution is given.
Geotechnical Engineering-I [Lec #15: Field Compaction]Muhammad Irfan
Class notes of Geotechnical Engineering course I used to teach at UET Lahore. Feel free to download the slide show.
Anyone looking to modify these files and use them for their own teaching purposes can contact me directly to get hold of editable version.
Class notes of Geotechnical Engineering course I used to teach at UET Lahore. Feel free to download the slide show.
Anyone looking to modify these files and use them for their own teaching purposes can contact me directly to get hold of editable version.
Geotechnical Engineering-II [Lec #19: General Bearing Capacity Equation]Muhammad Irfan
Class notes of Geotechnical Engineering course I used to teach at UET Lahore. Feel free to download the slide show.
Anyone looking to modify these files and use them for their own teaching purposes can contact me directly to get hold of editable version.
Class notes of Geotechnical Engineering course I used to teach at UET Lahore. Feel free to download the slide show.
Anyone looking to modify these files and use them for their own teaching purposes can contact me directly to get hold of editable version.
Slope Monitoring Systems – Enhancing GeotechnologyRussellCrue
Slope monitoring as we all know is a very useful methodology in geotechnical engineering. It particularly is used for assessment of safety of natural or manmade slopes.
Class notes of Geotechnical Engineering course I used to teach at UET Lahore. Feel free to download the slide show.
Anyone looking to modify these files and use them for their own teaching purposes can contact me directly to get hold of editable version.
This slide will help you to determine the immediate settlement for flexible foundation i.e. isolate footing and rigid foundation i.e. matt or raft foundation. To be more clear about the topic a numerical problem with the solution is given.
Geotechnical Engineering-I [Lec #15: Field Compaction]Muhammad Irfan
Class notes of Geotechnical Engineering course I used to teach at UET Lahore. Feel free to download the slide show.
Anyone looking to modify these files and use them for their own teaching purposes can contact me directly to get hold of editable version.
Class notes of Geotechnical Engineering course I used to teach at UET Lahore. Feel free to download the slide show.
Anyone looking to modify these files and use them for their own teaching purposes can contact me directly to get hold of editable version.
Geotechnical Engineering-II [Lec #19: General Bearing Capacity Equation]Muhammad Irfan
Class notes of Geotechnical Engineering course I used to teach at UET Lahore. Feel free to download the slide show.
Anyone looking to modify these files and use them for their own teaching purposes can contact me directly to get hold of editable version.
Class notes of Geotechnical Engineering course I used to teach at UET Lahore. Feel free to download the slide show.
Anyone looking to modify these files and use them for their own teaching purposes can contact me directly to get hold of editable version.
Slope Monitoring Systems – Enhancing GeotechnologyRussellCrue
Slope monitoring as we all know is a very useful methodology in geotechnical engineering. It particularly is used for assessment of safety of natural or manmade slopes.
SLOPE STABILITY RADAR-AN ADVANCED SLOPE MOVEMENT MONITORING SYSTEMRathin Biswas
Pit Slope Monitoring is a vital concern for Geotechnical Engineering. An early warning is required for
safety of the miners; proper selection of the monitoring tool is a vital parameter for miners safety visa-
vis economics. Slope Stability Radar being an advanced monitoring system, gives advance information
for slope movement.
Barriere Paramassi Etag027 e Norme Tecniche delle CstruzioniRockfall Defence
Breve presentazione che descrive in maniera molto semplificata quali conseguenze avrà l'entrata in vigore delle Norme Tecniche delle Costruzioni per il mercato delle barriere paramassi
New design approach on rockfall Embankment Thomas Frenez
La costruzione di rilevati paramassi in terra rinforzata sta diventando una soluzione comune per la protezione dal fenomeno della caduta massi. Questo tipo di strutture risulta infatti veloce e semplice da realizzare, e ha un impatto ambientale ridotto grazie al veloce attecchimento della vegetazione dopo la costruzione. Nonostante la semplicità di costruzione, il comportamento dinamico di tali strutture in risposta all’impatto di blocchi in roccia risulta complesso da modellare; nel corso degli anni sono stati proposti ed utilizzati numerosi modelli di calcolo, basati su concetti afferenti la balistica, sul principio dell’urto anelastico o su formulazioni geotecniche di tipo empirico. Alla luce delle richieste della nuova normativa italiana, gli autori si propongono di mostrare un caso di applicazione di un nuovo modello di calcolo (Carotti et al., 2003; di Prisco C. e Vecchiotti M., 2004) alla progettazione di un rilevato paramassi nel Comune di Ala (TN), finanziato dalla Provincia Autonoma di Trento. Lo strumento è in grado di valutare non solo la profondità di penetrazione del blocco all’interno del rilevato, ma anche gli effetti di una possibile attivazione di un meccanismo di rottura più ampio all’interno dello stesso.
AI for IA's: Machine Learning Demystified at IA Summit 2017 - IAS17Carol Smith
What is machine learning? Is IA relevant in the age of AI? How can I take advantage of cognitive computing? Learn the basics of these concepts and the implications for your work in this presentation. Carol Smith provides examples of machine learning use and will discuss the challenges inherent in in AI.
2. Types of Slope Failures
Falls
Topless
Slides
Spreads
Flows
Falls Topless
Slope failures consisting
p g Similar to a fall,
of soil or rock fragments except that it begins with
that droprapidly down a a mass of rock of stiff
slope
l clay rotating away from a
l t ti f
Most often occur in vertical joint
steep rock slopes
Usually triggered by
water pressure or
seismic activity
3. Slides Spreads
Slope failures that
p Similar to translational
involve one ore more slides except that the
blocks of earth that block separate and
move ddownslope b
l by move apart as they also
t th l
shearing along well move outward
defined surfaces or thin Can be very destructive
shear zones
Flows Types of Slides
Downslope movement of
p Rotational slides
earth where earth Most often occur in
resembles a viscous homogeneous materials
fluid
fl id such as fills or soft clays
Mudflow can start with a Translational slides
snow avalanche, or be in
avalanche Move along planar shear
surfaces
conjuction with flooding
Compound slides
Complex and composite
slides
4. The driving force (g
g (gravity) overcomes the
y)
resistance derived from the shear strength of
the soil along the rupture surface
g p
Slope stability analysis
Calculation to check the safety of natural
slopes, slopes of excavations and of
compacted embankments.
t d b k t
The check involves determining and
comparing the shear stress de eloped
developed
along the most likely rupture surface to
the shear strength of soil.
5. Factor of Safety
τf
Fs =
τd
Fs = factor of safety with respect to strength
τ f = average shear strength of the soil
τ d = average s ea st ess de e oped a o g t e potential failure su ace
a e age shear stress developed along the pote t a a u e surface
τ f = c + σ tan φ
c = cohesion
φ = angle of friction
σ = average normal stress on the potential failure surface
similarly
τ d = cd + σ tan φd
subscript 'd' refer to p
p potential failure surface
c + σ tan φ
Fs =
cd + σ tan φd
when Fs = 1, the slope is in a state of impending of failure.
In general Fs > 1.5 is acceptable
Stability of Slope
Infinite slope without seepage
Infinite slope with seepage
Finite slope with Plane Failure Surface
(Cullman s
(Cullman's Method)
Finite slope with Circular Failure Surface
(Method of Slices)
6. Infinite slope
L
c tan φ
β Fs = +
γ H cos2 β tan β tan β
d
a F
W
Na
B For granular soils, c=0 Fs is independent
soils c 0,
F Ta
c of height H, and the slope is stable as
H
long as β < φ
b Tr
β N
A r
R
L
d
Direction of
γ ' tan φ
a seepage
W c
Na
F =
Fs +
γ sat H cos2 β tan β γ sat tan β
B
Ta
c
H
T
β b r β N
A r
R
Finite slope with Plane Failure Surface
B C
W β + φd
Na
θcr =
Ta 2
τ f = c + σ tan φ
H unit weight of soil = γ
4c ⎡ sin β cos φ ⎤
Tr Nr
R
Hcr =
A
β θ γ ⎢ 1 − cos( β − φ ) ⎥
⎣ ( ⎦
7. Finite slope with Circular Failure Surface
Slope Failure Shallow Slope Failure
O
Toe Circle
Firm Base
O
Base Failure
L L
O
Slope Circle
Midpoint circle
Firm Base Firm Base
Slopes in Homogeneous Clay (φ=0)
For equilibrium, resisting and driving moment about O:
τ f = cu
O
MR = Md
θ C D
c dr 2θ = W1l1 − W2 l 2
Radius = r
W l −W l
cd = 11 2 2 2 l2 l1 cd
rθ H
F
W1
A B
τf cu
Fs = = W2
cd cd cd Nr (normal reaction)
E cd
critical when Fs is minimum, → trials to find critical plane
solved analitically by Fellenius (1927) and Taylor (1937)
cu
Hcr =
γm
presented graphically by Terzaghi &Peck, 1967 in Fig 11.9 Braja
m is stability number
8. Swedish Slip Circle Method
Slopes in Homogeneous Clay (φ>0)
τ f = c + σ tan φ
c d = γ H ⎡f (α , β ,θ ,φ ) ⎤
⎣ ⎦
c
= f (α , β ,θ ,φ ) = m
γ Hcr
where m is stability number
9. Method of Slices
For equilibrium
Nr = Wn cos α n
n=p
∑ ( c ΔL n + Wn cos α n tan φ )
Fs = n =1
n=p
∑W
n =1
n sin α n
bn
ΔLn ≈ where b is the width of nth slice
cos α n
Bishop Method
Bishop (1955) refine solution to the previous
method of slices.
In his method, the effect of forces on the sides
of each slice are accounted for some degree .
n=p
1
∑ ( cb
n =1
n + Wn tan φ )
mα ( n )
Fs = n=p
∑Wn =1
n sin α n
where
tan φ sin α n
mα ( n ) = cos α n +
Fs
The ordinary method of slices is presented as
learning tools. It is rarely used because is too
tools
conservative
10. Computer Programs
STABL
GEO-SLOPE
etc
Bibliography
Holtz, R.D and Kovacs, W.D., “An Introduction to Geotechnical
An
Engineering”
Das, B.M., “Soil Mechanics”
Das, B.M., “Advanced Soil Mechanics”