Difference Between Simplied Janbu and Bishop Slope Stability Methods
Difference Between Simplied Janbu and Bishop Slope Stability Methods
(OP)
I understand that in Bishop Slope Stability Analysis we are determining a FS based on moment equilibrium. In the Janbu Method we are determining based on force equilibrium. What I am having trouble determining is the merits of each and when one method would prove more applicable than the other.
RE: Difference Between Simplied Janbu and Bishop Slope Stability Methods
Either Spencer's procedure or the Morgenstern-Price method is most commonly used since both these methods satisfy both force and moment equilibrium.
Mike Lambert
RE: Difference Between Simplied Janbu and Bishop Slope Stability Methods
RE: Difference Between Simplied Janbu and Bishop Slope Stability Methods
If you are using a moderen slope stability program, I'm not familiar with GStable, there is no reason not to use a moderen analysis method. The only time I conider using Bishop's method is when I have a small slope with high undrained shear strength that is stable by inspection, but I have to determine and report a factor of safety (usually in the 4 to 10 range). Bishop's method will happly report a FS when more exact methods will indicate a tension crack is required that is deeper than the slope is high.
Mike Lambert
RE: Difference Between Simplied Janbu and Bishop Slope Stability Methods
Can anyone recommend any good specific literature or references for global stability analyses? I have a good number of geotechnical references, but they are all kind of lacking in regard to global stability.
RE: Difference Between Simplied Janbu and Bishop Slope Stability Methods
There is a lengthly discussion of different analysis methods in Appendix C of EM 1110-2-1902 which is the USACE slope stabiltity design manual. Page C-39 has a summary of several different methods. A copy of the manual can be downloaded here: http://www.publications.usace.army.mil/USACEPublic...
Other than the USACE manuals, I do not have a good reference for slope stability analysis. I will say that it takes a lot of experience to be good at it and that experience only comes from performing many hundreds of anlayses.
Let me know if you are looking form more specifics after you look at the EM and I'll try and help out.
mike
Mike Lambert
RE: Difference Between Simplied Janbu and Bishop Slope Stability Methods
https://www.youtube.com/watch?v=Q_6aOU7msBM
RE: Difference Between Simplied Janbu and Bishop Slope Stability Methods