复杂环境下高陡边坡危岩体控制爆破排险技术研究OA

Rock collapse,as a typical geological hazard,exhibits sudden occurrence and high destructive poten-tial,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 configura-tion with a hole network parameter of 0.35 m ×0.40 m,involving over 350 blast holes.The blasted debris fragmenta-tion size was precisely controlled with a maximum volume of 0.0429 m3.By applying air-deck charging in combina-tion with detonating cord series connection technology,the explosive pressure duration on borehole walls was pro-longed,generating a quasi-static pressure effect that successfully mitigated impact crushing and minimized long-dis-tance 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 reduc-tion.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.