what you have mentioned may be local failure resistance. the general failure should be checked. fdH'z:Xao
meanwhile, taking account of the ground water growth which may cause serious problems in practice. X)R]a]1A
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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.