In this chapter, three major stability analysis methods are introduced. Each
method will be discussed with many recent findings discussed. Based on the slip line
method and extremum limit equilibrium method, the classical slope stability, lateral
earth pressure and bearing capacity problems are unified under one formulation. A
Fortran code is also provided for the lateral earth pressure analysis based on the limit
analysis approach, and this code will be useful to many readers.
Keywords: Limit analysis, Limit equilibrium, Extremum principle, Slip
line, Unification.