Abstract：The engineering geological conditions of a bedding rock slope along Tangtun expressway are investigated systematically；then the types and causes of rock mass structures and the combination between structural planes and slope surface are studied in detail so as to analyze the bedding slope deformation mechanism. A geological model of the bedding rock slope is described by engineering geological profile and partitioned-area map of rock mass structure listed in the paper. The slope evolvement sketch of mechanism from deformation to failure is described；it is shown that the failure process of bedding rock slope，that is，large-scale blocks cut by rock bedding and intense joint band in upper-middle slope slide through bedding weak layer，and rock bends to the surface near slope where cataclastic rock mass exists，which causes the distortion and shearing slide plane in the first-step slope. When the sliding plane cuts through，the slope will fail. The result of FLAC3D numerical modeling indicates that the tension stress distributes along bedding weak layer and in cataclastic rock near slope surface；and potential sliding plane cuts through gradually. The result indicates that bedding weak layer and rock mass structure controls the types of slope deformation；and the present deformation is included in the beginning of the failure type of“creep-fracture and creep-bending”. Slope reinforcement based on the analysis of deformation mechanism focuses on controlling the distortion of cataclastic rock mass and potential shearing exit. Anti-slide pile combined with prestressed anchor and prestressed anchor frames are implemented to reinforce the potential landslide；and drainage works as auxiliary measures are also implemented. The monitored deformation curve indicates that the slope is stable in the rainy season.
