Abstract-Slope excavations are often constructed in stratified host rock masses in practice. In order to describe the effect of the inclination of layer of rock mass to the factor of safety of slope. a rock slope in one road is chosen as the engineering project. In the present paper, the stability mechanism of slope is analyzed. Numerical models for the slope are founded, the application method of shear strength reduction technique is discussed, and the convergence of numerical computations criterion is chosen as the failure criterion for slope. At last, according to the numerical calculation results, the influential factors to the stability of stratified rock slope are analyzed, to give guidance for the real practice. Keywords-Stratified rock, slope, factor of safety, joint inclinationI INTRODUCTION Slope excavations are often constructed in stratified (layered) host rock masses in practice [1]. The stratification in a rock mass is generally characterized by its planar geometry and persistence, such that it can be assumed to be continuous over plan areas much greater than that of the excavation [2]. It is obvious that the mechanical properties of the joints dictate both the deformation and strength characteristics of the stratified rock mass [3]. Thus, it is imperative that the influence of the joints be incorporated in any type of load-deformation analysis of slope excavations in layered rock masses.In the present paper, a rock slope in one road is chosen as the engineering project. Firstly, the stability mechanism of slope is analyzed. Secondly, numerical models for the slope are founded by fast lagrangian analysis of continua three dimensions (FLAC3D), the application method of shear strength reduction technique [4,5] in Ubiquitous-Joint model is discussed, and the convergence of numerical computations criterion is chosen as the failure criterion for slope. At last, according to the numerical calculation results, the influential factors to the stability of stratified rock slope are analyzed, to give guidance for the real practice. II NUMERICAL MODELThe numerical solution for predicting the strength of stratified rock mass is done by the ubiquitous-joint model in FLAC3D. This model accounts for the presence of an orientation of weakness (weak plane) in a FLAC3D MohrCoulomb model. The criterion for failure on the plane, whose orientation is given, consists of a composite MohrCoulomb envelope with tension cutoff. The position of a stress point on the latter envelope is controlled by a nonassociated flow rule for shear failure, and an associated rule for tension failure. In this numerical model, general failure is first detected and relevant plastic corrections are applied. The new stresses are then analyzed for failure on the weak plane and updated accordingly.

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