Kenneth M. Cruikshank
Slope Stability Programs

Program History

Part of my of landslide course involved writing code for the various slope stability methods. For many students at the time, the most accessible 'platform' was Microsoft Excel, so most everything was written directly as worksheet functions, which works well for methods of slices. The Janbu method was implemented as a visual BASIC macro in Excel. That code is presented below. I also put in a crude C++ version (a quick translation of an earlier

References

Baum, R. L. & Reid, M. E. 1995. Geology, hydrology, and mechanics of a slow-moving, clay-rich landslide, Honolulu, Hawaii. In: Clay and shale slope instability (edited by Haneberg, W. C. & Anderson, S. A.). Reviews in Engineering Geology X. Geological Society of America, Boulder, Colorado, 79-106.

Janbu, N. 1973. Slope stability computations. In: Embankment-Dam engineering (edited by Hirschfeld, R. C. & Poulos, S. J.) Casagrande. John Wiley & Sons, New York, 47-86.

Download

• Essential class notes (PDF)
• Slices.xls (See p. 16 of notes: Methods of Slices)
• janbu.xls (It is safe, but you will need to override default safety protocols in order to run the macro in the worksheet)
• janbu.bas
• janbu.cpp