特殊装药结构在风火山冻土隧道光面爆破中的应用研究

Study on a New Compound Decoupling Charge of Smooth Blasting in the Fenghuoshan Tunnel

针对青藏铁路风火山冻土隧道地质条件和气候条件特殊,隧道内气温温度高于围岩温度容易引起隧道围岩融塌的问题,分析了引起隧道工作面温度升高的原因,提出了一种盐水-空气复合不耦合装药结构,并进行了理论研究和模拟试验研究。结果表明,该装药结构既能降低隧道工作面的温度,也能减少爆破对隧道围岩的损伤,隧道现场周边眼应用爆破效果明显。

Due to specific geological and climate condition of the Fenghuoshan Tunnel in Qingzang railway, the wall-rock is easily collapsed since the gas temperature is higher than the wall-rock temperature in tunnel. In this paper, a new compound deeoupling charge （NaCl water and gas） was proposed after analyzing the cause of creating higher temperature at the working face. The new compound decoupling charge has been researched by theory and tested in the laboratory. Results indicate that the charge not only reduces the work face temperature, but also decreases the wall-rock damage. The blasting result is very dramatic after using the charge in the field.