Investigation of the Dynamic Response and Damage Mechanism of the Lining Structure to an Explosion Inside the Tunnel
1 Central Southern China Electric Power Design Institute
2 The Fourth Construction Co., Ltd. of China Construction Eighth Engineering Division
3 Central and Southern China Municipal Engineering Design & Research Institute
Abstract：
Explosions inside a tunnel may lead to the destruction or collapse of its lining and result in vehicular traffic 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 tunnel lining to surrounding 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 conducted. The results show that the peak overpressure and impluse decayed rapidly around ground zero with certain regularity. 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 crack at the straight walls and crown, which divided the monolithic tunnel lining into differently sized concrete blocks.
XIA Qian-1 Lu-Cheng-2,
HUANG Zheng-Gang-3
.Investigation of the Dynamic Response and Damage Mechanism of the Lining Structure to an Explosion Inside the Tunnel[J] MODERN TUNNELLING TECHNOLOGY, 2012,V49(6): 75-81
2012, Vol. 49 