what you have mentioned may be local failure resistance. the general failure should be checked. ;,k=<]
meanwhile, taking account of the ground water growth which may cause serious problems in practice. 9mDnKW
NEw$q4
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.