Road Cut Slope Stability - P28 - Stereonet

Problem 28. The face of a railway cutting in sandstone has a slope of 70 ̊ and its slope is towards direction 150 ̊. A structural survey of the site reveals that bedding in the sandstone constitutes important planes of weakness. The bedding attitude is 010/50SE and the angle of friction is 30 ̊. Indicate the type of failure that may occur and give your reasons.

[@FREDUgirashebuja]

An open pit rock slope at your mine is intersected by two fault planes and a set of
major joints. The dips, dip directions and friction angles of the faults and joint planes
are given in the table below:
Plane Dip Dip direction Friction angle
Fault 1 60° 114° 23°
Fault 2 80° 250° 20°
Joint set 1 40° 120° 25°
The dip and dip direction of the slope are 40° and 164° respectively. Use the stereonet
provided to determine whether there is potential instability in the slope. Then using the
wedge stability charts provided, determine the factor of safety of the slope. Comment
on the confidence you have in the factor of safety determined considering the
advantages and disadvantages of the methodology used.

[@suizrdz]

Oh my gosh!! You just saved my life, thank you so much for this video!!!

[@ZE0XE0]

id love a similar video for toppling and another for wedge failures.

[@seandunbar3814]

At 3:13 you counted: "10-20-30-50-60?" Think you may have plotted that strike wrong....

[@tareqalbukhari]

You are right 👍

[@theacademichelper1406]

Thank you very much 🎉

[@Soilnrock]

Amazing explanation! Beautiful, thanks! 02/12/2020

[@rajkirandhiman4208]

Great video Sir. waiting for Direct toppling failure specially. Wedge failure is very clear. Please make video on Direct toppling and flexural toppling. Thanks RK.

[@igorrubio8765]

Thanks for the class. Please give us some nice explanations for the rest of the failure types.

[@sayantanghosh6714]

Thank you so much for the great explanations!

[@98kibell]

Thank you so much - south korea

[@carloscuartas3391]

Amazing explanation

[@mohammadrezaahmadi4232]

Why you draw phi from the center? Phi degree should count from the perimeter.

[@_mug3n]

what a hero

[@carloscuartas3391]

Thank you a lot

[@farahnazabouk2461]

Very good

[@abdulsamad-tr1jw]

How we stabilizing this
For increasing the slope of cut or decreasing
The friction is it as
The bedding plane as it is

[@arunpratapsingh3652]

V well explained

[@ipeaceful6]

Very helpful. Thanks!

[@ZE0XE0]

is this only for a plane failure?

[@FREDUgirashebuja]

help

[@tongtongwang]

10 20 30 50 60...where is 40?

[@ketsareeudom2445]

Could you pls tell me how to plot daylight of toppling failue?

[@hikikomorihachiman7491]

what is this method called?
Equatorial equal method? or pole method?
Sir you put strike on 50 instead of 60?

[@mortazapirouz7482]

Correct, 50! I should fix the video.

[@sandipanmitra1685]

Why during the pole plotting of possible planes of failure the stereo is rotated 20 degree each time? How to get frictional angle?

[@ZE0XE0]

frictional angle is determined by testing the rock itself, at what angle two pieces of it start to slide.
He chose 20 degrees arbitrarilly because that was as precise as he felt like being. somebody could do it at 1 degree if they wanted, but it would take longer. ultimately it just creates a curved line so as long as you can see the trend and connect the dots with whatever resolution you choose thats all that matters.

[@KkkK-kr2we]

3:10 4:20
7:15
9:35
11:05

[@atulshulka3544]

Sir
How to decide friction angle 30 or other

[@makananaconda]

DAMET GARM DADASH