The kinematic stability of fractured rock slopes has been analyzed for the near-surface LILW (Low and Intermediate Level Radioactive Waste) disposal site in Gyeongju, South Korea. The slopes consist of a soil layer, a weathered rock layer, and fractured rock represented by discrete fracture network (DFN). Realistic rock wedges and blocks were identified in a three-dimensional model space and their factor of safety values were calculated for each of four statistically equivalent DFN models. External loading by soil and weathered rock layers were taken into account for the stability analysis. A dry fractured rock condition with the horizontal seismic acceleration of 0.3g was considered to analyze the stability of identified rock blocks/wedges. This preliminary numerical analysis showed the spatial distribution of identified unstable blocks on the slope and statistical distributions of volume and weight of unstable blocks over four statistically equivalent DFN models.

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