The common character of schist is transversely isotropic due to the existence of regular bedding planes

which means that the failure mechanism and deformation characteristics of such rocks have the obvious difference with common rocks. In view of this point

uniaxial compressive test on samples of Wudang group schist

Tongsheng tunnel

Shiyan-Fangxian expressway

that with schistosity inclination of 0°

45° and 90° respectively is carried out. The results show that: deformation parameters and failure mode of schist show obvious anisotropic characteristics. In the order of descending values of the modulus of elasticity

schistosity inclination of the samples are 90°

0°

45°respectively

in the order of descending values of the Poisson ratio

schistosity inclination of the samples are 45°

0°

90° respectively. The main failure mode is press off perpendicular to the spatial orientation of schistosity

shear and split off when schistosity inclination is 0°

45°and 90° respectively according to schistosity inclination. Based on above

the mechanism of deformation and failure characteristics of schist is analyzed

via electron microscope scanning and FLAC3D numerical experiment

it is considered that

the main reason is the different relationships between spatial orientation of schistosity and axial force direction

which caused obvious differences of contribution that of schistosity surface to schist deformation.