Відео

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29:45 I think its actually sqrt(3)*I1/3 = I1/sqrt(3)

What ratio of jello to water are you using?

Amazing explanation

Great explanation of critical state soil mechanics

Thank you for these lectures

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Hello can you write the steps I don’t understand this session professor

4:40 what do you mean by lowering the pore pressure

What is the name of the software used?

Excellent explanation

Great content. Thank you

Hi Nicolas, Can you please explain how to obtain sigma min and max from a practical perspective? (i.e. how do we obtain from the field to carry out these types of analyses?) Thank you.

Dear Prof. Espinoza, I have a question might be a silly one. For the Mohr circle (effective stress) part, wasn't the change in pore water pressure were not considered for layers above (overburden/vertical stress). So why the change in porewater pressure would also case the theta33 increase? Or the situation has been changed... Thank you so much...

For the sigma yy- for x>c the equation tends to be negative infinity instead of positive infinity, also for x<c the equation is not defined as it will come in terms of iota in denominator , kindly clarify...

Very valuable knowledge, thank you for sharing.

@21:00 the equation is valid only at the free surface, right? Because you crossed out the other two terms in the equation #3.

Thanks a lot for these videos. They are truly awesome. Please I need some help with calculating the vertical stress Sv for well logs with density values greater than 2.3g/cc. I used the equation TVDSSDepth * 1 * (BulkDensity / 2.3) for the topmost row. Then Sv1 * 1 * [Avg(BulkDensity2 : BulkDensity1) / 2.3] * [Depth2-Depth1] for row 2 and below. However I get Sv values all greater than 1.0psi/ft. Most tomes the values are up to 1.2psi/ft. In addition. the trend decrease with increasing depth. This doesn’t seem correct and I need your help explaining this please. Please note that I have tried these equations with a different well density log with values less than 2.3g/cc and everything seems perfectly fine. Advance thanks for your help.

Hi Prof! Thank you for your lectures . They are very helpful . Can you please refer me to the lecture where u have discussed wormhole generation and propagation due to sand production

Thank you for sharing your lecture, I have a question, may you answer this? I have the orientation of SHmax for a deviated well is 170N-S so when I calculate sigma_rr, now my theta is 170 degrees, isn't it?

In a deviated well, I have azimuth in the drilling report is 261.14 degrees at depth, so in your coordinate system, sigma= 261.14 degrees, isn't it??

Great video explaining this theory! I'm studying and preparing for my graduation thesis regarding the simulation of phonons, and that required some new material's science theory!

Typo alert [25:22]: should be du_2/dx_1 instead of du_2/dx_2

Sir , why do we take average of the strain rate , why not take the sum of the strain . It baffles me so much

Hi Sir. I'm just confused. I just noticed that the linear equation you used in this video is different from the spring 2020 lecture which leads to different values of TVDSS even it was the same example.

hello. how can you have porosities in the vicinity of 30% for shales?

how can you have porosities in your table in the vicinity of 30% to 40% in shales?

Why the model doesn't have cohesion (like Mohr-Coulomb or Drucker-Prager), being the cohesion a fundamental characteristic of a Clay?

Prof Espinoza, excellent lecture, thank you for sharing with all of us. Have you posted the lecture you did on the undrained solution?

I have learned a lot from your lectures Dr.Espinoza , thanks

Could you explain please why the model doesn't consider the cohesion being that one of the most important characteristic of a clay is the cohesion? Thank you in advance.

Could you explain please why the model doesn't consider the cohesion being that one of the most important characteristic of a clay is the cohesion? Thank you in advance.

Like for not giving up on the ellipse :)

Hola, cuál es el libro guía que utilizas para tus apuntes?

Hi, I have a structural geology exam coming up and I need some help. Is there any way I can contact you via email to ask for help?

Typo alert: around minute 5 the correct equation is "Delta q / Delta p' = 3". Thanks to a viewer for pointing out the mistake!

Good❤

Are these Kirsch equations, as written, valid for thick wall cylinder testing?

Thank you for Nicolas, Watching this lesson from Indonesia

Thank you very much for your sharing. Your videos are useful with me

In section 6.2.2, the handwritten equations for \sigma_{rr} and \sigma_{\theta\theta} each have two terms that use \Delta \sigma (=\sigma_Hmax - \sigma_hmin). However, in the typed equations for \sigma_{rr} and \sigma_{\theta\theta} in section 6.2.3, each have only one term that uses \Delta \sigma...where did the second \Delta \sigma term go?

Hand written equation for deviatoric shear stress, sigma_rtheta in section 6.2.2, has leading negative sign while the typed equation in section 6.2.3 does not have the negative sign. Which is correct?

Thank you so much sir

Wow!

I am quite relieved after watching your video. Thank you!

03:33 Why the 1 psi/ft? Why not use the (rho)*(g)*(h) formula? Not all region in the world can be applied with 1 psi/ft.

Excellent presentation.

Great job !

Good job

Clear lecture professor Espinoza.... useful for my class on mechanical behavior!