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# comparaison between analytical methods

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## comparaison between analytical methods

(OP)
Hello
So i was discussing with an expert on slope stability, and he stated that he uses bishop methods all the time .
When i argued that using it on transnational slides is not a good idea , he then answered that it can be viewed as a cercular failure with an infinite or very big radius .
What are your comments about this ?

### RE: comparaison between analytical methods

There are slight improvements that can be made by applying one hand method or another to a given problem (based on soil type, geometry).. As I recall from some papers I read during my research, Janbu might be the most "accurate" of the hand or spreadsheet applicable solutions.

That said, for practical design purposes, this is largely irrelevant -- the factor of safety you'll need to apply will cover the slight variation. The counter case would be if you need to predict a failure point (rather than just determining a safe non-failure solution). In that case, you'd want to try to pick the method best suited to your site.

I also tend towards Bishop's method -- reasonable results, and simple to implement.

### RE: comparaison between analytical methods

If you are only analizing homogenous slopes, then yes you could use Bishops method with a very large radius to get close to the results from a wedge type failure. However, if you are working in most real world situations where the soils are no homogenous, then you need a method that can handle different shaped failure surfaces.

I use Spencer's method. This is the method recommended by the USACE and is supported by many current slope stability software packages.

Mike Lambert

(OP)
thank you all

### RE: comparaison between analytical methods

Hi
Its depend on the type of slope you r analyzing. Let me know type of slope and conditions please.

Meantime see following paper if you fin it interest.
https://www.academia.edu/9805623/A_new_geotechnica....

Thanks.

### RE: comparaison between analytical methods

(OP)
Rasika or it Razika ^^
As i stated its just a general question , just an argument with an old man who believe that Bishop's method can be applied in every single case. I wasn't trying to look intelligent or something but i tested him with a delicate question : When mudflow or earthflow is initiated what kind of method should we be using ? and he stuttered for the answer was fluid mechanics :D

Thanks for the document

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