为研究在长大断面隧道中爆破产生的冲击波传播规律，以攀枝花至大理高速公路宝鼎2号隧道为工程背景，通过建立三维数值模型，在LS-DYNA中分析了爆轰产物和冲击波的传播形态，并基于超压准则对爆破冲击波在隧道内的传播规律进行研究。研究结果表明： 1)16 kg TNT炸药在隧道内爆轰产物的极限传播距离为20 m； 2)冲击波在未接触到隧道壁面时以“球对称”形式向四周传播，在经过隧道壁面多次反射后最终以二维平面波的形式向前传播； 3)受隧道内壁面多次反射影响，冲击波在轴向和径向的超压时程曲线传播规律基本相同，伴随着多个波峰震荡，呈明显的锯齿状衰减； 4)冲击波沿横断面径向传播时，最大超压值在离隧道轴线3/4半径处陡然增大，且隧道壁面处最大超压值为轴线处最大超压值的1.3倍。

To study the law of shock wave propagation caused by blasting in long and large crosssection tunnels, the Baoding No. 2 tunnel on the PanzhihuaDali expressway is taken as an example to analyze the detonation products and shock waves in LSDYNA using 3D numerical simulation model. The overpressure criterion is introduced in this study. The research results show the following. (1) The maximum propagation distance of detonation products of 16 kg TNT explosive in the tunnel is 20 m. (2) The shock wave propagates to the surroundings in the form of "spherical symmetry" before it touches the tunnel wall, and finally propagates forward in the form of "twodimensional plane wave" after multiple reflections from the tunnel wall. (3) Affected by multiple reflections on the inner wall of the tunnel, the propagation law of the shock wave in the axial and radial overpressure time history curves is basically the same, accompanied by multiple wave peaks, showing obvious sawtooth attenuation. (4) When the shock wave propagates in the radial direction of the crosssection, the maximum overpressure suddenly increases at 3/4 radius from the tunnel axis, and the maximum overpressure at the tunnel wall is 1.3 times the maximum overpressure at the axis.