Abstract: Granite is one of the most widely distributed rock types on Earth. Its characteristic of penetrating diabase veins and locally developed fracture zones affect the stability of the rock mass and pose a safety hazard to construction sites. A kinematic analysis method based on threedimensional projection and the vector algebra theory was established to analyze the overall and local failure modes of a granite steep slope. The DISP software was applied to analysis the stability of the local slope. The probability of overall planar sliding, wedge shaped deformation, and toppling failure of the southern, western, and northern slopes is very low when only considering the condition of penetrating structural planes. When considering other structural planes simultaneously, there is a higher possibility of the local wedge failure in the southern slope. Further combining the mechanical parameters of the structural plane, the calculated wedge stability coefficient meets the requirements of the specifications. The results of the failure mode and the stability analysis have also been verified by the actual on-site condition and slope deformation monitoring data. The exploration in this article will provide a reference for the failure mode and the stability analysis method of granite steep building slopes.

Key words: High and Steep Slopes, Granite, Kinematics, Destruction Mode, Slope Stability