Cushion Pad of Reducing Blasting Vibration — Starting New Era of Decreasing Disaster in Civil Engineering

Abstract

The paper introduces a cushion pad which has simple structure and is easy used in blasting engineering. This device can not only avoid large amount of cracks on the rock slope and cumulative damage to surrounding rock mass upon blasting, but also cushion and reducing vibration of blasting. It is first used in Panzhihua Xujiagou iron open pit, Huayinshan coal mine with gas in SiChuan province, Miaowei hydropower station in Yunnan province and Minshui tunnel blasting engineering in Xin-Fen highway in Hebei-Shanxi province. It effectively cushion the heavy detonation shock from explosion avoiding the damage surface of surrounding rock and accumulated damage of rock, thus improve stability of rock mass and save a large amount of support costs. It is also used for decreasing disaster of engineering blast, e.g., collapse, roof fall or instability landslide. The vibration velocity with cushion is 50% less than with pre-splitting blasting, even less than the threshold of blasting vibration accumulated damage. Ratio of semi-hole archive is about 95%.