摘要
本文依托贵广铁路同马山隧道工程,根据理论分析及现场作业反馈,对水平产状砂质板岩隧道的洞室爆破成形参数进行研究。研究结果表明:(1)对于此段工程隧道,爆破参数拟定为炮眼直径42 mm,不耦合系数1.4,周边眼间距443 mm,炮眼密集系数0.73,最小抵抗线610 mm,单孔装药量0.42 kg,周边眼数目62;(2)根据选定参数进行的洞室光面爆破,得到79%的隧道断面平均线超挖量符合要求,75%的隧道断面最大线超挖量符合要求,爆破效果良好。研究成果可为水平层状围岩地区隧道建设提供有利借鉴。
Based on Tongmashan tunnel of Guizhou-Guangzhou Railway, this paper studies the blasting parameters for cavern formation of tunnel in the horizontal occurrence sandy slate according to theoretical analysis and field operation feedback. The results show that:(1) in this section of tunnel, the blasting parameters are proposed to be 42 mm for blasthole diameter, 1.4 for uncoupling coefficient, 443 mm for distance between peripheral holes, 0.73 for hole density coefficients, 610 mm for minimum resistance line, 0.42 kg for charge of single hole, and 62 for number of peripheral holes;(2) according to the selected parameter, the smooth blasting was carried out. Both 79% average line overbreak and 75% maximum line overbreak of tunnel section meet the requirement, and the blasting effect is good. The research results can provide a useful reference for tunnel construction in horizontal layered surrounding rock area.
作者
孟令瀚
崔光耀
MENG Linghan;CUI Guangyao(North China University of Technology,Beijing 100144,China)
出处
《高速铁路技术》
2019年第6期21-25,共5页
High Speed Railway Technology
基金
国家自然科学基金(51478277)
关键词
铁路隧道
水平产状
砂质板岩
洞室成形
爆破参数
railway tunnel
horizontal occurrence
sandy slate
cavern formation
blasting parameters
