CE 326 webcast on triaxial shear testing; Section 11.9
Пікірлер: 192
@simonnguyen36064 жыл бұрын
whoever gave this a thumbs down must be CRAZY! Being able to see a visual representation of what is happening on the graph while the test is being conducted is what makes this such an effective video. I look forward to viewing your other videos CHEERS!
@alideep96562 жыл бұрын
I live where the Triaxial stress is so expensive and the university never turned the device on or fully explain how things go during the test, I can't thank you enough for this outstanding explanation.
@robertplautz97226 жыл бұрын
it is hard to find videos of this quality: clear sharp narration, easy-to-understand, detailed explanation, amazing graphical (visual) presentation. thank you so much!
@m3talh3ad183 жыл бұрын
Thank you so much for your simplified and on the point explanations. I tried a lot of text books but everything was a bit complicated, for me. Your voice is clear and slides are well made.👍🏾
@emmerydickinson83026 жыл бұрын
A simplify yet comprehensive explanation about triaxial tests. Thanks a lot for a helpful video
@rafiullahqallander7 жыл бұрын
Dear Professor Kitch, Thank you so much for such incredible explanation; you saved my life :)
@taladiv34154 жыл бұрын
Thank you yet again Prof. Kitch for using your talents to help unlucky students make sense of all the letter and figure salad !
@muhammedajmal7153 жыл бұрын
It was an excellent presentation with to the point explanation with figures. Easy to understand the concept. Thank u soo much professor
@user-ww5cm6zw2w4 жыл бұрын
Thanks for your video! Its clearly observed misbeliefs of foreign geotechnical engineering based on outdated Therzagi's theory. Very helpful for my students.
@AroundRavikant8 жыл бұрын
extremely thankful to u for this video... i was confused from many days about this topic.
@gh50303 жыл бұрын
That’s what happens when we mix the hight knowledge and super teaching ability, very very useful, much better than my text book.. thank you so much
@meaghanmacquarrie37557 жыл бұрын
Thank you for this video. You have helped me develop a better understand on concepts I have struggled to learn. This is one of the best videos I have come across. I especially liked the corresponding mohr-circle diagram to triaxial type test! Thank you!!!
@debangsu31814 жыл бұрын
SUCH A SIMPLE AND TO THE POINT EXPLANATION OF CU,UU,CD TESTS
@39shobhit9 жыл бұрын
very nice and effective presentation .... all the concept that you have told can be easily understood ......thank you for this great work ....
@mounika5013 жыл бұрын
Outstanding explaintion I'm really happy with thus vedio nd I learn very much about this topic
@n4tsumi3 жыл бұрын
Really helpful for confused engineering student like me! thank you!
@zs65113 жыл бұрын
Best video for triaxial shear test.
@VikashKumar-vl4hv7 жыл бұрын
excellent video, one of the best study tutorial video i have gone through. thanks a lot sir
@shahriarislam71343 жыл бұрын
Wishing to see more of these helpful videos
@rhushitparmar59394 жыл бұрын
Thank you so much. It's very conceptual and cleared my all doubts.
@SauravKumar-ic4ly3 жыл бұрын
Thank you so much for this video, such an amazing way of explanation.
@gildanibarcentti59543 жыл бұрын
Excellent explanation! Love your ending :)
@omkardhamane2693 жыл бұрын
Thank you so much for this video....I was very confused about this topic
@sayantanmunshi99695 жыл бұрын
Detailed presentation should be like this. Thank You Sir
@contacttaimur8 жыл бұрын
Many thanks. This video was really helpful. And its like The Godfather, I watched it 3 times and still enjoyed it.
@riccardocandeago46999 жыл бұрын
Thank you! This will help me with my geotechnics exam :)
@ShashiKumar-yv7wf6 жыл бұрын
Thank u very much for this video. One of the best video I have ever seen. All my concept about this topic is clear now.
@JamanMonir8 жыл бұрын
absolutely great tutorial or lecture. helpful for anyone who was in doubt like me. Thanks by the way
@aveenaaspaudel80405 ай бұрын
In 13:55, you said that effective stress is greater than total stress, but in other books and videos, pore water is positive and it gets subtracted from total stress.
@ferfixer29 жыл бұрын
Thanks!! This video helped me a lot. However I do not understand why is in consolidated and undrained triaxial test the pore pressure negative. Could you tell me?
@introductiontogeotechnical49769 жыл бұрын
ferfixer2 When soils are sheared under drained conditions they can either contract (decrease in volume) if they are relatively loose or dilate (increase in volume) if the are relatively dense. This happens because soils are made up of individual particles that roll and slide over each other during shearing. If the soils are saturated and sheared under undrained conditions there cannot be any volume change (contraction or dilation) because both the soil and water are incompressible (relatively speaking). So instead of volume change during shear, there is a different reaction--change in pore pressure. Relatively loose soils generate positive pore pressure during shear because the soil wants to compress and push out some water. Relatively dense soils generate negative pore pressure during shear because the soils wants to dilate and draw water in. Hope that helps. I have some nice ideas for videos on this, but they won't be done for some time.
@adriananazcocampoverde19187 жыл бұрын
Introduction to Geotechnial Engineering Excelent!
@krishnakadiyam28644 жыл бұрын
@@introductiontogeotechnical4976 best reply of my utube life
@scientificresearch14004 жыл бұрын
@@introductiontogeotechnical4976 waiting sir
@introductiontogeotechnical49764 жыл бұрын
Vishabjeet Singh Rajput please see this webcast for an explanation dilation and contraction during shear. kzbin.info/www/bejne/jnSygYGDec2Loa8
@luongtuananh12206 ай бұрын
very good demostration thank you a lot
@James-oc3fr Жыл бұрын
Thanks for video. it is really helpful for me to understand. good explanation. great
@a7.tynxt_ Жыл бұрын
you're a total mvp sir
@sarahgibson4922 жыл бұрын
Excellent, concise and clear!
@gtrslayer15 жыл бұрын
Thank you! Extremely helpful.
@rawalali51825 жыл бұрын
thank you sir . it helped me clear my concept quite efficiently.
@parasbhatia69999 жыл бұрын
very nice video . thank you very much for such a quality content.
@eatedalalqusaireen36648 жыл бұрын
Very helpful. Could you give practical examples when to use each test??????????
@fabienwang5706 Жыл бұрын
worth more than my undergraduate degree lol, imaging being a geotech student and studying all the important stuff on YT......, says a lot about university education..
@xavierariverahernandez55509 жыл бұрын
Good Video. Thank you! The last part was the best!
@krissiregar80838 жыл бұрын
when explaining CU test, you must know the consolidation state of the soil speciment. just like +Adam Perez asked and +Riad L. explained. when the clay soil is NC, the effective stress envelope moves to left and if the clay soil is OC, the effective stress envelope moves to right
@dr_greg_mouse41254 жыл бұрын
This is a great video indeed. Thanks.
@madhureddyindian97155 жыл бұрын
Sir I love your explanation. I greatly appreciate your work. Love from India.
@tonyk20383 жыл бұрын
Thank you for this video!
@frozentesla77714 жыл бұрын
this video saves my life thanks Godbless
@sagarsrsshah9 жыл бұрын
Cleared my doubts. Thanks!
@davidliu23287 жыл бұрын
thank you for being so awesome!!!!
@mohamadoubanhoro91889 жыл бұрын
great video on triaxial shear test
@caebc8 жыл бұрын
The Best video
@dragonborndovahkiin65237 жыл бұрын
Yes
@90761732386 жыл бұрын
Amazing explanation!
@CuteCookie967 жыл бұрын
That was very helpful, THANK YOU!
@DeepakKumar-hw1ih4 жыл бұрын
In Consolidated-Undrained Test, Why negative pore pressure is developed ? Why not positive pore pressure ?
@SunitaDevi-sv2bo3 жыл бұрын
Thank you sir
@superbananavoltex8 жыл бұрын
Hi, thanks for the informative video, I learnt a lot! However, there's something that has been bugging me. From what I understand on my notes and also from my search, effective stress = total stress - pore pressure. But from your video on the part of CU, effective stress = total stress + pore pressure? Do correct me if my understanding on the video is wrong.
@rajatkushwaha42964 жыл бұрын
for consolidated undrained test of normally consolidated clays in my textbook ....effective stress mohr circle is depicted by solid lines while total stress circles are by dashed lines also total stress circles are shifting right to the effective stress circles .....i.e effective stress are less than corresponding total stresses......i am confused.
@hikuuuuuuu2 жыл бұрын
Thank you so much!!!!
@bmansan6 жыл бұрын
Excellent explanation
@leung772 жыл бұрын
Dear Professor Kitch, may I raise out a question on the CU test that why a negative pore water developed such that effective stress is larger than the total stress, shifting the Mohr Circle to the right? Thank you
@introductiontogeotechnical49762 жыл бұрын
Dense or overconsolidated soils tend to dilate during shear, that is increase in volume. In this case, we’re shearing under undrained conditions, e.g. no volume change allowed. Therefore, instead of dilating, the soil responds by generating a negative excess pore pressure.
@muhammaduneebalam50294 жыл бұрын
Love you sir!
@alxms103 жыл бұрын
I have a question: in the last test (CU), first you allow water to drain slowly to measure sigma_3, and then close valve to measure excess water pressure, how did the gauge measure water pressure? Did you fill the sample with water again after drainage and before closing valve?
@adamperez19939 жыл бұрын
At 14:00 during the CU test why was the effective stress circle shifted to the right? Isn't this a positive pore water pressure? Negative would be a suction. Sigma' = Sigma - u
@oussamaali83938 жыл бұрын
+Adam Perez review terzaghi postulate
@sanngo80025 жыл бұрын
I think the pore pressure is positive, but the change in pore presssure delta u is negative.
@nikossidiropoulos56273 жыл бұрын
you actually wrote it Sigma' = Sigma - u, only that u is negative, so -(-u)=+u
@shahzadikhan83566 жыл бұрын
best explanation ever
@yinminthann4822 Жыл бұрын
thank you Prof.
@chrisronald28566 ай бұрын
really nice video
@lulukobe8nba3 жыл бұрын
thx a lot Prof
@DEEPAKKUMAR-lt6iy5 жыл бұрын
Very good videos I am happy with this
@dann54806 жыл бұрын
god bless the Americans!
@nafiaykut65563 жыл бұрын
I want to ask a question.I have calculated Fs from Michalowski’s (2002) 1.875 and I have calculated Fs=2.047 from slope stability program.What is the reason of this difference?
@jacksonzheng42887 жыл бұрын
Why do we have a negative pore pressure during the CU test??
@JL-mj2eh6 жыл бұрын
It's depends on soil is normal consoilidated clay or over consoilidated clay. Each has different tendency of volume strain which lead to +or- pore pressure.
@walidtlili74156 жыл бұрын
I still dont get it
@moipu88686 жыл бұрын
I reckon if the sample is OC/very stiff it would dilate during the first part of shearing and so the volume of the sample would increase. The increase in volume would cause -(ive) pore pressure ...silly
@saminyead12336 жыл бұрын
Basically, pore pressure generally seeks to decrease the effective stress of soil. Thus, if pore pressure increases the effective stress, it means the pore pressure is negative. As to why this can happen, you have to keep in mind that pore pressure usually seeks to decrease effective stress only if the soil is saturated. In other words, the pore pressure is negative only if the soil is saturated. Here, during the CU test, since we drained the soil sample in the consolidation phase, a significant amount of water has left the soil sample and thus it is no more saturated. In unsaturated conditions, the pore pressure is negative. This is the reason for the negative pore pressure. If you want to know why pore pressure is negative during unsaturated condition, then I suggest you visit this link - environment.uwe.ac.uk/geocal/SoilMech/water/water.htm Hopefully, you'll get your answer. :)
@CivilConqueror6 жыл бұрын
In CU test there will be effective stress in confining stage as per my imagination and concepts but hear taken total stress in confining stage
@nimeshmakwana567 жыл бұрын
Suparb explanation...👌👌
@228MOHAMED4 жыл бұрын
God Bless you
@khantahsinazad4250 Жыл бұрын
You are excellent
@sevvalkursun16 Жыл бұрын
Thank you so much hocammmmm
@pedrokaluf41896 жыл бұрын
best video ever!! nice job
@ashoktalks6108 Жыл бұрын
Thank you very much
@hirasingh44955 жыл бұрын
Amazing video!
@parveshshukla36155 жыл бұрын
its very helpful video
@mdarifhossain3275 Жыл бұрын
Thank you so much.
@baltichannelskardu3 жыл бұрын
Nice
@krishanundas54976 жыл бұрын
really nice presentation...
@shaidleon92594 күн бұрын
Thanks a lot
@albayrakcan4 жыл бұрын
awesome thank you!
@ahmedobidat17436 жыл бұрын
I read in your book (Foundation Design Principles and Practices 3rd edition) this statement. In general su (phi = 0) increases with depth because the lower portions of the stratum have been consolidated to correspondingly greater loads, and thus have a higher shear strength. Would you please explain why does consolidation increase shear strength? Thank you so much!
@introductiontogeotechnical49766 жыл бұрын
Consolidation increases the density and decreases its void ratio. This will both stiffen and increase the strength of the soil.
@ahmedobidat17436 жыл бұрын
Your the man! Thanks a lot!
@MehsamTanzimKhan7 жыл бұрын
very good explanation! !
@yektakaya46356 жыл бұрын
does consolidating the soil mean the confining pressures are increased ? Because it says the soil is consolidated before being compressed
@arking12088 жыл бұрын
Thanks a lot, good lecture
@bhandaribishnuhari72237 жыл бұрын
everything is clear sir ..
@victimboy77655 жыл бұрын
Excellent! That is all I can say!
@halilibrahimsahin46394 жыл бұрын
Thanks from Turkey
@introductiontogeotechnical49764 жыл бұрын
You’re welcome.
@chimoscreations91037 жыл бұрын
amazing video
@nikossidiropoulos56273 жыл бұрын
13:21 - CU test, should the σ3 value at the consolidation stage be effective consolidated stress like in CD test at 11:53?
@george67092 жыл бұрын
no but you can obtain the effective stress by subtracting the pore pressure from the gauge
@srimanideepallavarapu9256 жыл бұрын
excellent
@hoggerz2 күн бұрын
The Mohr's Circle for the Consolidated-Undrained test is incorrect. Effective stress is total stress minus pore water pressure (σ' = σ - ∆u). σ' would be less than σ, the dotted circle should shift left, not right.
@willliamkitch29672 күн бұрын
The Mohr’s circles are correct. This soil in the animation is generating negative excess pore pressure during shear so the effective stress increases. Negative excess pore pressure occurs when overconsolidated clay or dense sand is sheared under undrained conditions.
@mohituniyal48398 жыл бұрын
thanx a lot.... great lecture
@waseembhat26578 жыл бұрын
great video
@satishr53072 жыл бұрын
Thank you :)
@williamt.szeibert86994 ай бұрын
If CD takes longer to conduct than the CU, and gives you the same parameters as CU, when would you use a CD test over a CU test?