Abstract：Through researching the dip effect of layer plane on the shearing strength parameters of argillaceous siltstone and limestone and the dip effect of structural plane on the mechanical property of gypsum samples，the dip influence of structural plane on the parameters of shearing strength of stratiform and stratified structures is analyzed in detail，and the mechanism of anisotropy of mechanical property of stratiform and stratified structure is discussed. The principle of determining shearing strength parameters of stratiform and stratified structur is put forward. The correlation formulas between the dip of structural plane and parameters of stearing strength are established for different kinds of stratiform and stratified rock masses，respectively. The triaxial tests of gypsum samples of stratiform and stratified structures show that the proposed formulas are useful for determination of shearing strength of the similar rock structures.
