CUSHION BLASTING METHOD COMBINING HOLE BOTTOM DAMAGE CONTROL AND FAST EXCAVATION

摘要

Disclosed is a cushion blasting method based on a combination of hole bottom damage control and fast excavation, comprising steps: step 1. drilling in rock bodies vertical blasting holes that have collinear circle centers and are in rows; step 2. laying a cushion layer on the hole bottom of the blasting holes, the cushion layer being loose sand, rock powder or fine sand; step 3. adopting a rope to draw an energy dissipation seat to enter the blasting holes, and enabling the bottom surface of the energy dissipation seat to be placed on the cushion layer; and step 4. adding blasting powder inside the blasting holes and detonating the blasting powder after blocking it. The present invention is suitable for one-time formation of excavation for dam foundation surfaces and slope path protection layers, and has advantages such as a simple process, low cost, and a desirable excavation effect.