Abstract: The connectivity rate of dominant joints which extend outward along high rock slope plays an important role in the slope’s overall stability, but research on the sensitivity of slope stability to connectivity rate is insufficient. In view of this, qualitative and quantitative methods were employed to research the high rock slope (180m) at the water inlet of Wudongde hydropower station at Jinsha River. On the basis of connectivity rate statistics and the weighted average parameters of the “bottom sliding surface” combined with rock bridge, the stability factor of slope was calculated by using rigid limit equilibrium method. The degrees of connectivity rate’s influence on slope stability were obtained. Moreover, in the statistics using bandwidth projection method, the selection of bandwidth also has big influence on the connectivity rate and the stability factors.

Key words: dominant joints extending outward along the slope, Wudongde hydropower station, high slope, connectivity rate, stability, bandwidth