The first discussion in rigorous 3D formulation is not correct. There are already method which can satisfy at least 5 equilibrium conditions - see paper by Cheng in ASCE Dec. 2007. The third discussion - method by Cheng is good in numerical stability, see also the variational method paper by Baker in Soils and Foundations 1987. Line/surface of thrust is not guaranteed to be correct, eq.(12) is not better than f(x,y). !6|_`l>G,
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These papers are interesting and useful, but method of column and division of meshes are practically the same ?