风火山隧道光面爆破盐水不耦合装药结构试验研究

研究目的:针对青藏铁路风火山冻土隧道特殊地质条件和气候条件,研究隧道内气温高容易引起隧道围岩融塌的问题。研究方法:理论分析引起隧道工作面温度升高的原因,针对盐水-空气复合不耦合装药结构,进行理论与模拟试验研究。研究结论:爆生气体是影响冻土热平衡的主要热源之一;盐水介质对爆生气体的降温效果十分显著,高达70%;采用NaCl盐水水炮泥封堵炮孔的技术措施,可达到降低工作面温度和有效降尘的目的;采用复合不耦合装药结构可以有效降低爆破对围岩的损伤。

Experimental Research on Saline Water Decoupling Charge Structure for Smooth-wall Blasting to the Fenghuoshan Tunnel

Research purposes:Aiming at the specific geological and climate conditions of the Fenghuoshan Tunnel on Qinghai-Tibet Railway,the study is made on the problem that the wall rock collapses easily because of high temperature in tunnel.Research methods:The theoretic analysis of the cause for raising temperature in the tunnel is made and also the theoretic and simulation testing researches are made on the saline water-air compound decoupling charge structure.Research conclusions:Explosive gas is one of heat resources which influence the balance of frozen soil.Saline water medium has a good result in lowering the temperature of explosive gas with 70%.The aims of lowering the temperature of working face and reducing dust can be achieved by using NaCl saline water taming plug to block explosive mouth,and also the damage to rock wall can be reduced effectively by adopting complex decoupling structure.