摘要
随着我国高速公路网的逐渐完善,山岭隧道建造的数量越来越多,修建隧道中遇到的不良地质情况也越来越复杂,尤其是隧道穿越地层富含瓦斯时,给隧道的修建工作带来了挑战。以成都洛带古镇隧道为工程案例,采用显示动力学分析软件AUTODYN在考虑衬砌结构和空气的流固耦合作用下建立数值模型,对隧道衬砌结构在由瓦斯爆炸产生的冲击荷载作用下的速度和位移响应及衬砌结构受损破坏过程进行了计算分析,数值模型中以TNT模拟瓦斯。计算结果表明,在不同TNT当量作用下,超压峰值以爆心在仰拱地面上的投影点为中心向四周衰减;超压峰值和炸药量成正比,爆炸冲击波在衬砌结构的纵向和径向运动过程不尽相同,衬砌各部位的受损程度也不尽相同,最终是局部破坏导致衬砌结构的整体破坏,使得衬砌结构失去支护承载能力。
In the paper taking Luodaiguzhen tunnel for example, the numerical model is established by using the explicit dynamic analysis software AUTODYN, considering fluid-solid coupled interaction, the numerical model used to simulate the velocity and displacement response and damage process of the tunnel lining structure under internal blast loading, gas is simulated by TNT in the numerical model. The results show that in different amounts of explosive, peak overpressure taking detonation point that projection in the inverted arch as the center, it attenuates around rapidly. The overpressure peak is proportional to the amount of explosive, explosion shock wave motion process in the lining structure of longitudinal and radial direction are not the same, in various parts of the lining structure the damage degree are not the same, ultimately local failure results in lining structure of overall damage, and the lining structure loses support capacity.
出处
《公路》
北大核心
2017年第4期324-330,共7页
Highway
关键词
瓦斯爆炸
爆炸荷载
动力响应
数值模拟
研究
gas explosion
explosion load
dynamic response
numerical simulation
study
