摘要
装药结构是改善裂隙岩体爆破效果的重要因素,结合某隧道爆破掘进工程,通过地质雷达现场岩体损伤探测及柱状装药爆破损伤理论估算,获取隧道掌子面前部裂隙岩体爆破损伤规律,并提出基于其爆破损伤规律的装药结构。雷达探测发现:隧道掌子面前部裂隙岩体受爆破开挖损伤明显,Ⅳ级岩体的裂隙区范围最大值约2.4 m,Ⅲ级岩体为1.8 m,均位于下一装药区域内,理论计算与雷达探测结果基本一致。利用获得的掌子面前方裂隙岩体的爆破损伤规律,提出了"减药非连续装药"装药结构,可减少裂隙区炮孔二分之一装药量。实践证明:该装药结构能提高爆破有效能,降低工程成本与围岩损伤。
The charging structure is an important factor to improve the blasting effect of fractured rock.This study takes a tunnel blasting excavation project for example.The damage detection of rock is carried out by ground penetrating radar and the damage theory of cylindrical charge blasting is used to estimate the damage zone.The blasting damage rule of the fractured rock mass in front of the tunnel excavation working face is obtained.Then charging structure based on its blasting damage rule is proposed.The geological radar detection found that the fractured rock in front of the tunnel excavation working face was obviously damaged by blasting excavation,the maximum value of the crack area for grade IV and III rock is about 2.4 m and 1.8 m,which all locate in the next charge area.The radar detection is basically consistent with the theoretical calculation results.According to the blasting damage characteristics obtained,the'reduced and discontinuous charging'structure is proposed,which can reduce one-half of the charge in blast-hole in the fracture zone.It is proved by practice that the charge structure can improve the effective blasting energy,which can reduce the cost of the engineering and the damage of the surrounding rock.
作者
唐海
易帅
王建龙
丁安松
焦兵
TANG Hai;YI Shuai;WANG Jian-long;DING An-song;JIAO Bing(School of Resources,Environment and Safetyengineering,Hunan University of Science and Technology,Xiangtan 411201,China)
出处
《爆破》
CSCD
北大核心
2019年第1期70-76,89,共8页
Blasting
基金
国家自然科学基金资助项目(51374104)
关键词
爆破损伤
裂隙岩体
地质雷达
减药非连续装药
blasting damage
fractured rock
ground penetrating radar
reduced and discontinuous charging
作者简介
唐海(1970-),男,湖南省祁阳人,博士、副教授,主要从事采矿与岩石力学方面的教学和研究,(E-mail)tang hai707298@163.com。
