双联拱隧道爆炸时程分析和动力响应：以甘肃省奤盖隧道为例

考虑现实生活中隧道面临易燃易爆气体的爆炸和偶发车辆碰撞的爆炸,以甘肃省卓尼县柳林镇附近的奤盖隧道为工程背景,运用有限元软件Midas/GTS NX进行隧道爆炸模拟数值分析,分析了在静力荷载和炸药当量条件下,双联拱隧道的受力影响,对隧道围岩及衬砌进行了位移、速度、加速度和应力时程分析和响应研究。结果表明：当发生爆炸作用时,隧道横向和径向受到应力冲击波以及反射冲击波的影响最为显著,当超过一定值的时候,隧道就会发生局部剪切破坏或剥落破坏；由于反射波的存在,围岩和衬砌的速度和加速度均会呈现出多个峰值,且距爆源位置越近,衬砌的结构损伤也越严重；隧道应力集中区域表现出明显的抗拉抗压,迎爆面应力响应最为显著。

Time-course analysis and dynamic response of double-arch tunnel blasting: A Case Study of Ha Gai Tunnel in Gansu

Considering the real-life scenarios of a tunnel facing explosion risks from flammable and explosive gases as well as accidental vehicle collisions, numerical simulation using finite element software Midas/GTS NX was employed to analyze the influence of forces on a double-arch tunnel near Liulin Town, Zhuoni County, Gansu Province. The analysis focused on both static load and explosive equivalent conditions. Displacement, velocity, acceleration, stress time history analysis, and response research were conducted for the surrounding rock and lining of the tunnel. The results indicate that during an explosion event, the transverse and radial effects of stress shock waves and reflected shock waves are most significant. When these effects exceed a certain threshold value, local shear failure or spalling failure may occur in the tunnel. Due to the presence of reflected waves, multiple peaks in velocity and acceleration are observed in both surrounding rock and lining materials with more severe structural damage closer to the location of explosion source. Additionally, there is an evident concentration area showing tensile and compressive strength within the tunnel along with significant stress response on the blasting surface.