Abstract:

Taking the interlayered rock mass composed of greenschist and marble as study subject, numerical analysis on uniaxial and biaxial compression creep tests of interlayered rock mass was done by FLAC^3D. Lots of influencing factors such as geometric relationship between loading direction and layer, volumetric content of marble interlayer and stress level were taken into account in the numerical analysis. The research results show that the absolute values of axial strain and strain in the incline direction of interlayer increased firstly and then decreased when the dip angle of interlayer increased from 0° to 90° under uniaxial and biaxial compression states. Axial compressive deformation and dilatant deformation in the two lateral directions decreased with the increased volumetric content of marble interlayer under uniaxial and biaxial compression states. The axial compressive deformation when axial loading orientation was perpendicular to bedding plane was larger than that when axial loading orientation was parallel to bedding plane under uniaxial compression. The axial compressive deformation was the largest when axial loading orientation was perpendicular to bedding plane and lateral loading orientation was parallel to bedding plane, and was the smallest when axial loading orientation was parallel to bedding plane and lateral loading orientation was perpendicular to bedding plane.

Key words: interlayered rock mass, FLAC^3D, multi-axial compression, creep property