Nice explanation, sir. I have two questions. why is the curve of least resistance exactly a logarithmic spiral? Also, in the diagram for friction stress, the friction stress we are talking about is on the surface of elastic zone, right ? If so then why is it not constant ?
1) difficult question to answer. The shear plane wants to find a path back to the ground surface, but it needs to “turn around”. That path of turning around usually takes the shape of a log spiral. 2) the elastic zone extends across a certain depth of soil. Friction is a linear function of stress (....remember the Mohr-Coulomb failure criterion). Therefore, as depth increases, friction will increase linearly as well.
@@officehours4028is this friction force is similar to the passive force like in Rankine's theory required to cause failure on the slip surface(curved in this case) ? Or is it just the friction force on the surface of elastic zone due to foundation loading, (analogy to friction on inclined plane due to a simple load resting on the plane)?
@@officehours4028 if so (analogy to vertical load on an inclined plane), then it should be linear as friction is uniformly distributed on the plane, isn't it, sir ?
I am thankful for a very comprehensive lecture. I have a question, as how can we find the extent/dimensions of zone II and zone III. thanking you in anticipation.
Thank you Prof. Franke,
i enjoyed your lessons and added much to my knowledge, am following your lessons from Egypt.
thanks for your much efforts.
Congratulations!!. Very useful lessons. Greetings from La Paz in Bolivia!
Professor Franke
thanks for all your lessons..i already finished your Elementary Soil Mecahnics Class
Thank you so much following you from TANZANIA. 👍💪
Please upload the rest of the couse as soon as possiple ..... thank you for sharing an amazing knowalage with us 🌹
looking forward to CEEN542!
CEEN442
Thanks for the video! Great explanation.
These lectures are amazing. And it is wonderful to know where the formulas you have learnt, come from. Thaaaank you very muchh. Greetings from Peru.
15:17 I love that part: "that is the ugliest (censored) arrow I've ever drawn".
Missing your lecture on pile goundations. I am glad I found you.
Thanks for sharing your knownledge!
thank you very much for these very nice videos, if you don't mind, could you use the metric units in your calculations for the next lectures.
Yes please, or at least have both.
The rest of the world has no idea what psf, feet, psi, pounds... are.
Both units are used as international standards. SI units are French-defined to mean notations change in 10 values.
Very good explanation. Thankyou very much sir!
Your videos are amazing! I don't think I would be able to understand the mohr circle if it wasn't for you.
Thank you for your clear explanations!
Thank you so much for the this great lesson
Good Job!
Great presentation
Can you post remaining foundation engineering topics with in this month
Nice explanation, sir. I have two questions.
why is the curve of least resistance exactly a logarithmic spiral?
Also, in the diagram for friction stress, the friction stress we are talking about is on the surface of elastic zone, right ? If so then why is it not constant ?
1) difficult question to answer. The shear plane wants to find a path back to the ground surface, but it needs to “turn around”. That path of turning around usually takes the shape of a log spiral.
2) the elastic zone extends across a certain depth of soil. Friction is a linear function of stress (....remember the Mohr-Coulomb failure criterion). Therefore, as depth increases, friction will increase linearly as well.
@@officehours4028is this friction force is similar to the passive force like in Rankine's theory required to cause failure on the slip surface(curved in this case) ?
Or is it just the friction force on the surface of elastic zone due to foundation loading, (analogy to friction on inclined plane due to a simple load resting on the plane)?
The latter.
@@officehours4028 if so (analogy to vertical load on an inclined plane), then it should be linear as friction is uniformly distributed on the plane, isn't it, sir ?
@@WordsandNumbers1 its frictional resistance which is sigma'*phi'..n see..it increases LINEARLY with depth.
thank you old man
I am thankful for a very comprehensive lecture. I have a question, as how can we find the extent/dimensions of zone II and zone III. thanking you in anticipation.
Absolutely love your videos! Thank you!!! One question at 32min 19sec for case (I) What is Gamma (2) equation? Thank you!
Gamma 2 is the unit weight of the soil within the frictional wedge.
Where is the ceen 442 :)?.. thanks for ur explanation doc as always
great lecture, thank you!
Thank you very much , it is so helpful
Thank you!!!,,,,,Very informative video! 100%
sir thank you for the knowledge...
Thank you very much!
Please do send me the link of CEEN 442.
What textbook should i use for reading soil mechanics?
For Soil mechanics you can use principle of soil Mechanics by Braja M. Das. It's a very good book to understand the basic
Bravo!!!!!!!!!!!!!!!!!!!!!!!
thank you
thanks
You must keep Pinky the elephant away from that pen.
26:45