平行双自由面爆破岩墙自稳临界宽度研究  

Research on critical width of blasting with parallel double free surfaces

作　　者：苗晓鹏 陈慧 焦国芮 施建俊[4] 孟海利 MIAO Xiao-peng;CHEN Hui;JIAO Guo-rui;SHI Jian-jun;MENG Hai-li(China Aerospace Planningand Design Group Co.,Ltd,Beijing 100071,China;WISDRI Wuhan Iron and Steel Design&Research Institute Co.,Ltd.,Wuhan 430080,China;Jiangxi Copper Technology Institute Co.,Ltd.,Nanchang 330046,China;School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;Railway Engineering Research Institute,China Academy of Railway Sciences Group Co.,Ltd.,Beijing 100081,China)

机构地区：[1]航天规划设计集团有限公司,北京100071 [2]中冶南方武汉钢铁设计研究院有限公司,武汉430080 [3]江西铜业技术研究院有限公司,南昌330046 [4]北京科技大学土木与资源工程学院,北京100083 [5]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081

出　　处：《工程爆破》2022年第6期51-57,共7页Engineering Blasting

摘　　要：在平行双自由面爆破一侧具有重点保护对象时,通过控制岩墙自稳临界宽度(最后一排炮孔到自由面的宽度),使得爆破一侧岩体充分破碎、抛掷,另一侧(有保护对象一侧)岩体达到“碎而不散”的自稳状态。基于多边界爆破理论,阐述了平行双自由面爆破的边界条件、药量与抛掷效果的关系;通过建立等效子药包模型,推导出双侧抵抗线的关系,进而确定了岩墙自稳临界宽度的理论取值为2.05W(最小抵抗线);结合渝怀复线漾头越行站站改工程,通过岩墙拆除爆破的单排逐孔起爆现场试验,确定了岩墙自稳临界宽度的实测值为2.5W,获得了良好的爆破效果,为类似工程提供理论指导。When there is a key protection object on one side of the parallel double free surface blasting zone, by controlling the critical width of self-stabilization(the width from the last row of blastholes to the free surface), the rock mass is fully broken and thrown on one side of the blasting zone, and the other side the rock mass(there is a protection object) has reached a self-stable state of "broken but not scattered". Based on the theory of multi-boundary blasting, the relationship has expounded between the boundary conditions of parallel double free surface blasting, explosive amount and the throwing effect. By establishing an equivalent sub-explosive packet model, the relationship between the bilateral resistance lines is deduced. Then the theoretical value of the critical width of self-stability is determined to be 2.05W(minimum resistance line). Combined with the reconstruction project of the Yangtou Yuexing Station on the Yuhuai Second Line, through the single-row hole-by-hole initiation field test of rock wall demolition blasting, the measured value of the critical width of self-stabilization was determined to be 2.5W, and good blasting effects were obtained. It is a similar project provide theoretical guidance.

关 键 词：平行双自由面爆破 自稳临界宽度 最小抵抗线 岩墙爆破 等效子药包 

分 类 号：TD235[矿业工程—矿井建设]