what you have mentioned may be local failure resistance. the general failure should be checked. }@a_x,O/x}
meanwhile, taking account of the ground water growth which may cause serious problems in practice. I.q nA
R2t5T-8`c
the practice only using soil anchors is rarely seen. generally it is combined with shotcrete with wiremesh or work together with earth-retaining wall which is stablized by the waler/capping beams.