The　existence　of　soil　anisotropy　makes　the　strength　and　deformation　of　the　ground　dependent　on　the　loading　direction,　which　should　be　considered　in　some　geotechnical　engineering　designs.　This　paper　introduces　the　anisotropic　transformed　stress　method　that　generalizes　the　isotropic　failure　criterion　and　constitutive　model　for　anisotropic　cases　through　modifying　the　stress.　This　method　brings　much　convenience　for　the　solution　of　practical　problems　in　the　anisotropic　ground.　The　anisotropic　Mohr-Coulomb　failure　criterion　is　still　a　linear　function　of　stress　since　the　internal　friction　angle　and　cohesion　remain　constant　along　different　directions.　A　simple　and　explicit　formula　for　the　passive　earth　pressure,　which　adds　only　an　influence　coefficient　of　soil　anisotropy　to　Rankine＇s　formula,　is　derived.　The　elastoplastic　stiffness　matrix　of　the　anisotropic　modified　Cam-Clay　constitutive　model　does　not　increase　any　extra　item　compared　with　its　general　expression,　so　that　finite-element　simulation　can　be　easily　conducted　to　predict　the　surface　settlement　induced　by　tunnel　excavation.　Based　on　the　aforementioned　formula　and　simulation,　the　degree　of　anisotropy　and　the　depositional　direction　of　the　ground　on　the　effects　of　the　passive　earth　pressure　and　the　surface　settlement　trough　are　systematically　analyzed.