The anisotropic characteristics of stratified rock mass are considered by ubiquitous-joint model. The FLAC3D software is used to analyze the deformation, failure and the displacement of the key monitoring points of a tunnel passing through the stratified rock with different dip and inclination. The results show that the effect of deformation and stability of rock mass varies with the dimensional orientation of structural planes. When the inclination of rock stratum remains invariable, with the increase of dip angle of rock stratum, the displacements around tunnel are of a decreasing trend. When the dip angle of rock stratum remain invariable, with the increase of inclination of rock stratum, the displacements of rock surrounding in vault and floor had fluctuated, the displacements of side wall had increased. The study has been played an important role to assure the safety and quality of the tunnel and can be used further for the guiding of the similar tunnel construction.


In recent years, as the country gradually implementation of the strategy for the large scale development of the western region and the "Rising in Central China", many great basic projects had been developed rapidly, such as water conservancy and hydropower engineering, railway engineering and highway engineering and so on. The tunnel has become an indispensable part of the basic projects. Tunnel is concealed in the mountain, so the engineering geology of underground surrounding rock and the hydrogeological conditions will directly affect the safety of tunnel construction. The attitude of rock stratification has a direct relationship with stability of the tunnel, especially in stratified rock mass. The stratified rock mass have significant anisotropic characteristics not only for deformation and strength properties, but also failure mechanism of rock mass and is distinctly different from other rock (Xian 1989a, b, Hoek 2000, c, Li 2001).

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