数码雷管错相减震爆破技术在地铁隧道施工中的应用  

Application of Staggered Phase Damping Blasting Technology of Electronic Detonator in Guiyang Metro Tunnel

作　　者：任登富 简中飞 孟祥栋 张学民[3] 郑文昌 孟令天 REN Deng-fu;JIAN Zhong-fei;MENG Xiang-dong;ZHANG Xue-min;ZHENG Wen-chang;MENG Ling-tian(Guiyang Urban Rail Transit Group Co Ltd,Guiyang 510000,China;Chongqing Construction Engineering Group Co Ltd,Chongqing 400000,China;Central South University,Changsha 410075,China;Ranken Railway Construction Group Co Ltd,Chengdu 610000,China;CREEC(Chongqing)Survey Design and Research Co Ltd,Chongqing 400023,China)

机构地区：[1]贵阳市城市轨道交通集团有限公司,贵阳510000 [2]重庆建工集团有限公司,重庆400000 [3]中南大学土木工程学院,长沙410075 [4]中铁隆工程集团有限公司,成都610000 [5]中铁二院重庆勘察设计研究院有限责任公司,重庆400023

出　　处：《爆破》2020年第2期53-59,共7页Blasting

基　　金：国家自然科学基金面上项目(51978671);郑万铁路客运专线科技计划项目(2016-068)。

摘　　要：城市地铁施工爆破对近接建筑物的安全影响及防护技术,是行业持续关注的热点和难点问题。针对硬岩地层隧道非电毫秒分段延期爆破减震效果难以满足安全振速标准问题,依托贵阳轨道交通2号线省医站4号出入口暗挖隧道工程,开展了数码电子雷管错相减震爆破技术的应用研究。结果表明:利用数码电子雷管起爆精准授时特点,基于错相减振原理优化各炮孔之间的微差时间,控制孔间振动波主振相错开约半个周期,可实现降低爆破振速的目的;在不改变炮孔数量、单孔装药量的情况下,仅调整炮孔爆破延期时间,相同位置测点爆破振速由2.71 cm/s降至1.39 cm/s,减小48.7%。通过工程应用试验,保证了邻近老旧建筑物的安全,提高了效率,缩短了工期。The impact of urban subway construction blasting on the safety of adjacent buildings and its protection technology are the hot and difficult issues that the blasting industry continues to pay attention to.Aiming at the problem that the shock absorption effect of non-electric millisecond section delayed blasting in hard rock stratum tunnel cannot meet the safe vibration velocity standard,the application research of digital electronic detonator staggered shock absorption blasting technology is carried out based on the underground excavation project of No.4 of Provincial Medical station of Guiyang Rail transit Line 2.The results show that the blasting velocity can be reduced by using precise timing characteristics of digital electronic detonator,optimizing the differential time between each hole based on the principle of stagger vibration reduction,and controlling the stagger of main vibration phase of vibration wave between holes for about half a period.Without changing the number of holes and single hole loading quantity,only adjusting the delay time,the blasting vibration velocity at the measuring point at the same position was reduced from 2.71 cm/s to 1.39 cm/s,decreasing by 48.7%.Through engineering application test,the safety of adjacent old buildings is guaranteed,the efficiency is improved,and the construction period is shortened.

关 键 词：地铁隧道 数码电子雷管 单孔单响 错相减震 老旧建筑物 

分 类 号：TD235.3[矿业工程—矿井建设]