Accordingtothefailuremodel,thispaperdividedthewedgeintofallingwedge,singleslidingtypeanddoubleslidingtype.Itanalyzedthestabilityofthreetypesofwedgewiththerigidbodylimitequilibriummethod,anddeducedthreesetsofformulatocalculatethestabilitycoefficient.Theexp