CEEN 341 - Lecture 19 - Intro to Shear Strength and the Direct Shear Test

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Hands down best Geotech lecturer on YT😎.....THANK YOU

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Great presentation indeed, love your diction and rhythm while presenting!

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Great presentation. Thank you professor Franke!

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[@kingshukmukherjee5789]

Thank you so much sir!! I couldn't grasp the concepts and had literally lost complete interest in soil mechanics course of my curriculum. But your videos have been extremely helpful . Thanks a lot sir!!!

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Glad you like them!

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Cant pity myself enough. I just found out this lecture in a few days to graduate.

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[@estebanmunoz7486]

Great lecture. Thanks

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Thanks so much for your great sharing

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You are so welcome

[@feliciamichael5916]

Thank you for the explanation

[@thenineminus1]

Does anyone understand how the angle Professor Franke found on 20:11? I don't understand why.

[@mehulkatakiya4892]

an external angle at any corner with an extension of a line will be a summation of two other angles of the triangle.

[@rayoaklight]

two radius of the circle therefore the triangle has two equal corners (0cr) . then the external angle 180-(180-20cr)

[@RaghunandanReddyC]

3:00 That house is horrified.

[@officehours4028]

HAHAHA....yes, it is

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Thank you Sir. 😊

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[@mrwwang6233]

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[@matkontakos924]

Hi prof, im really into geotechnics but it's quite hard to really understand the concentps.Could you be more specific about the symmetrie of mohr-coulomb criteria,the symmetrie means that the element fails at to planes? one above and one below? or at one only and the direction is govern by the nature of the element?

[@officehours4028]

By definition, a circle is symmetric. Mohr's circles are symmetric about their center. For simple loading assumptions, the stresses that define the circle are symmetric on both sides of the sigma axis (i.e., the x-axis). In advanced soil mechanics, you will learn that the failure envelope is also "sort-of" symmetric about the sigma axis, meaning that there is a failure envelope on the negative side of the sigma axis that represents the failure state for tension. It has a different friction angle than the failure envelope for compression though, so it's not really symmetric.

[@mehulkatakiya4892]

at 43:28, while calculating tau, a contact area between soil decrease. shouldn't we consider?

[@officehours4028]

You could, but the change in area is small enough and its effect is negligible such that most engineers ignore it.

[@mehulkatakiya4892]

@@officehours4028 but even if sample get failed at a displacement of 0.5 cm..then reduction in area is 3 sq.cm. if we are using 6 cm * 6 cm box..i think which is considerable..but yeah..considering full area will give us conservative results..lower tau and lower phi..👍..thank you.😊