超大抵抗线硐室爆破的工程实践ENGINEERING PRACTICE OF OVER-BURDEN CHAMBER BLASTING
谢飞鸿,关惠平,姚朝贵,解烨,杨路强
XIE Fei-hong~1; GUAN Hui-ping~1; YAO Chao-gui~2; XIE Ye~2; YANG Lu-qiang~2 (1. Lanzhou Jiaotong University;
摘要(Abstract)：
在硐室掘进过程中 ,由于管理不善 ,其中一条硐室的轴线偏离了设计方位 ,导致药室的最小抵抗线由原设计的 40m增大到实测的 5 7m。抵抗线超过 5 0m的硐室大爆破十分罕见 ,无经验可以借鉴。针对地形起伏变化的情况 ,采取大坡度设计施工主硐与药室 ,掘进坡度最大达 + 172‰ (约 10°)。在工期特别紧张的情况下 ,合理利用已掘进成形的药室形状 ,调整装药结构、装药位置及条形药包的装药量 ,同时加大了条形药室端部药量 ,采用类哑铃形装药结构 ,使超大抵抗线的硐室大爆破获得成功。
Because of improper construction management in chamber excavation,the axial direction of a chamber has a great dviation from the designed direction,causing that the burden of charged chamber is increased from designed 40m to measured 57m.The chamber blasting with a burden larger than 50m is very rare,thus there being no referable experience.In the light of undulating topography,the pilot tunnel and charged chamber are excavated in a great slope of +172‰(approximate to 10°).With a short working term,the over-burden chamber blasting is crowned with success through reasonable utilization of the shape of excavated chamber, adjustment of linear charge's structure,position and mass,as well as increase of the end charge and adoption of dumbbell-like charge structure.
关键词(KeyWords)：
超大抵抗线;硐室爆破;装药结构;条形药包
Over-burden; Chamber blasting; Charge structure; Linear charge
基金项目(Foundation):
作者(Authors):
谢飞鸿,关惠平,姚朝贵,解烨,杨路强
XIE Fei-hong~1; GUAN Hui-ping~1; YAO Chao-gui~2; XIE Ye~2; YANG Lu-qiang~2 (1. Lanzhou Jiaotong University;