微差爆破技术在湄洲湾航道三期(Ⅱ阶段)炸礁施工中的应用

Application of millisecond priming technology in reef blasting construction of Meizhou Bay channel third phase(stageⅡ)

针对福建省湄洲湾航道三期炸礁施工中强风化岩石地质条件、礁石覆盖面积超过16.9万m 2、施工空间有限、通航管制、爆破地点距离最近构筑物仅470 m等问题,进行单段炸药量、振动波强度、孔网布置、潮汐变化等方面的研究。采取∅115 mm炮孔、2.0 m×2.5 m的孔网布置和排间微差爆破技术,并利用潮汐作用进一步削减爆破带来的负面影响,顺利完成施工任务。结果表明:单段炸药量不大于300 kg时,爆破施工产生的振动波未对周边生产生活区域造成不良影响,利用潮水可一定程度上削减振动波。

Aiming at the problems of strong weathered rock geological condition,reef cover area more than 169,000 m 2,limited construction space,navigable control,and blasting site only 470 m away from the nearest structure in the third phase of reef blasting construction of Meizhou Bay waterway in Fujian Province,we study the single-stage explosive quantity,vibration wave intensity,hole network layout,and tidal change.We apply∅115 mm blast hole,2.0 m×2.5 m hole network layout and inter-row millisecond blasting technology,use the tidal effect to further reduce the negative impact of blasting,and successfully complete the construction task.The results show that when the single-stage explosive quantity is not more than 300 kg,the vibration wave generated by blasting construction does not adversely affect the surrounding production and living areas,and the use of tidal water can reduce the vibration wave to a certain extent.