摘要
作为典型的地质灾害,岩体崩塌具有突发性强、破坏力大等特点,严重威胁周边区域人民群众的生命与财产安全。目前,对可能发生崩塌的危岩体实施爆破处理是一种广泛采用的防治手段。以广西南宁市上林县龙贵村后背山危岩体为研究对象,采用孔网参数为0.35 m×0.40 m的高密度钻孔布置,共施炮孔350余个,将爆破碎石块度严格控制在单体体积不大于0.0429 m^(3);通过空气间隔装药结合导爆索串联技术,延长爆炸压力对孔壁的作用时间,形成“准静态压力”效应,有效避免冲击粉碎和远距离飞石;将总装药量462 kg分为6段,按“由外向内”的顺序起爆,段间延时20 ms,最大段药量控制在79.2 kg,借助岩块碰撞实现二次破碎,进一步降低碎石块度。爆破最终形成“碎石瀑布”式塌落,成功完成爆破排险作业。本工程为山区交通干线、民用建筑等设施邻近区域临空危岩体的爆破排险提供了可靠的技术路径与实践参考。
Rock collapse,as a typical geological hazard,exhibits sudden occurrence and high destructive potential,severely threatening lives and infrastructure in adjacent areas.Currently,control blasting has become a prevalent mitigation measure for unstable rock masses susceptible to collapse.This study investigates the unstable rock mass on the back hill of Longgui Village,Shanglin County,Nanning City,Guangxi,utilizing a high-density drilling configuration with a hole network parameter of 0.35 m×0.40 m,involving over 350 blast holes.The blasted debris fragmentation size was precisely controlled with a maximum volume of 0.0429 m^(3).By applying air-deck charging in combination with detonating cord series connection technology,the explosive pressure duration on borehole walls was prolonged,generating a quasi-static pressure effect that successfully mitigated impact crushing and minimized long-distance flyrock hazards.A total explosive charge of 462 kg was strategically divided into six segments with sequential outward-to-inward initiation using 20 ms inter-segment delays,maintaining a maximum charge of 79.2 kg per delay interval.This design promoted rock-to-rock collisions for secondary fragmentation,resulting in enhanced size reduction.The blast successfully generated a controlled"rock debris waterfall"collapse pattern,completing the hazard mitigation operation.This project establishes a technically viable approach for the removal of overhanging rock masses near critical infrastructure,including mountain transportation corridors and civilian structures.
作者
张健
姚宁
黎勇
安荣杰
卢世佳
ZHANG Jian;YAO Ning;LI Yong;AN Rong-jie;LU Shi-jia(Nanning Handing Blasting Engineering Company,Nanning 530005,China;Institute of Urban Safety and Environmental Science,Beijing Academy of Science and Technology,Beijing 100054,China;Nanning Engineering Blasting Association,Nanning 530003,China;Natural Resources Bureau of Shanglin County,Nanning 530599,China)
出处
《爆破》
北大核心
2026年第1期130-137,共8页
Blasting
关键词
山体危岩
复杂环境
爆破排险
密集孔与隔离装药
unstable rock mass on mountain slopes
complex environment
blasting for risk removal
dense drilling and isolated charging
