The operation safety of arch dams is greatly affected by the excavation quality of the abutment slots.The exca-vation blasting technology adopted in the left bank abutment slot of Yebatan Hydropower Station is introduced.Pre-split-ting holes and vertical bench blasting technology are adopted with reasonable drilling and blasting parameters.The blas-ting charge amount and the maximum single-shot charge amount are strictly controlled.And the segmented millisecond delay blasting technology is adopted.With these technologies,satisfactory excavation performance is achieved and useful experience is accumulated.The on-site excavation results show that the abutment slot is well formed and the damage of the retained rock mass is effectively reduced,ensuring that the blasting excavation quality of the abutment slot meets the design requirements.
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