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以青藏高原风火山隧道常年冻土(岩)爆破技术为研究对象,运用理论分析、试验研究、数值模拟和现场测试等方法,对冻土爆破技术进行了系统研究.通过对隧道数值模拟发现隧道轮廓顶部震动速度最大,温度变化比较明显.分析了影响冻土热平衡的外部热源因素,并完成了NaCl水溶液降低爆生气体温度试验,在周边炮眼采用盐水炮泥解决了爆生产物热源问题;针对隧道围岩性质,提出了不同围岩条件下开挖方案,最后对隧道爆破振动进行了监测.
Taking the perennial frozen soil (rock) blasting technology in the Fenghuoshan Tunnel of the Qinghai-Tibet Plateau as the research object, this paper systematically studies the technology of the frozen soil blasting by using the methods of theoretical analysis, experimental research, numerical simulation and on-site testing. Through the tunnel numerical simulation, At the top of the contour, the maximum vibration velocity and the obvious temperature change were analyzed.The external heat source which affected the heat balance of the frozen soil was analyzed, and the experiment of reducing the gas temperature of the explosion gas by NaCl aqueous solution was completed. Tunnel surrounding rock properties, proposed under different rock excavation program, and finally the tunnel blasting vibration monitoring.