摘要
隧道内爆炸作用可能导致其衬砌结构的破坏和坍塌,造成车辆通行受阻和生命财产损失。为了研究隧道衬砌结构的抗爆性能,应用AUTODYN软件建立了隧道衬砌-岩石-土壤的三维数值模型,并考虑炸药-空气-结构的流固耦合相互作用,以及隧道内爆炸作用对衬砌结构的动力响应和损伤机理进行了数值模拟分析。结果表明:在不同炸药量作用下,超压峰值及冲量以爆心地面投影点为中心,向四周迅速衰减,表现出一定的规律性;离爆心最近的底板首先出现损伤,并向四周扩展,直墙角部由于受到底板竖向变形而引起的拉应力作用,较早地出现损伤,在直墙壁和拱顶产生纵向和环向的裂缝,这些裂缝把整体式隧道衬砌结构分割成大小不等的混凝土块体。
Explosions inside a tunnel may lead to the destruction or collapse of its lining and result in vehicular traf- fic disruption and loss of lives and property. In order to investigate the anti-explosion performance of a tunnel lining, a 3D numerical model was built with AUTODYN software regarding the relationship of the tnnnel lining to surround- ing rock and soil. In addition, considering the interaction of explosives, air, and fluid structure, a simulation analysis of the dynamic response and damage mechanism of the tunnel lining under explosive action inside a tunnel was con- ducted. The results show that the peak overpressure and impulse decayed rapidly around ground zero with certain regu- larity. The bottom slab nearest ground zero was damaged first and expanded all around. Damage occurred early at the corner of the straight wall due to the tensile stress caused by the vertical deformation of the bottom slab, resulting in vertical and circumferential cracks at the straight walls and crown, which divided the monolithic tunnel lining into dif- ferently sized concrete blocks.
出处
《现代隧道技术》
EI
北大核心
2012年第6期75-81,87,共8页
Modern Tunnelling Technology
关键词
爆炸作用
隧道衬砌
动力响应
损伤机理
数值模拟
Blast action
Tunnel lining
Dynamic response
Damage mechanism, Numerical
