隧道内爆炸作用衬砌结构的动力响应和损伤机理研究  

Investigation of the Dynamic Response and Damage Mechanism of the Lining Structure to an Explosion Inside the Tunnel

作　　者：夏谦[1] 卢成[2] 黄正刚 

机构地区：[1]中南电力设计院,武汉430071 [2]中建八局第四建设有限公司,青岛266071 [3]中国市政工程中南设计研究总院,武汉430010

出　　处：《现代隧道技术》2012年第6期75-81,87,共8页Modern Tunnelling Technology

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.

关 键 词：爆炸作用 隧道衬砌 动力响应 损伤机理 数值模拟 

分 类 号：U451.4[建筑科学—桥梁与隧道工程]