what you have mentioned may be local failure resistance. the general failure should be checked. h,RUL
meanwhile, taking account of the ground water growth which may cause serious problems in practice. 1*Fvx-U'
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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.