大断面隧道爆破工程中，爆破效果与地应力的存在密切相关，高地应力环境对深埋隧道围岩压力、变形和稳定性影响显著。为了探究大断面隧道爆破时地应力对隧道近区岩体的动力响应及掌子面损伤演化分布，通过大型有限元模拟软件ANSYS/LS-DYNA建立本构模型，对无地应、地应力分别为50、60、70 MPa 4种工况进行数值计算。结果表明，不同工况下拱顶位置的有效应力峰值及振动速度峰值均最大，说明拱顶是隧道开挖面最危险的位置；无地应力时，底板中部处损伤深度最大，为3.84 cm；地应力在一定程度上对爆破效果起抑制作用。

In the blasting engineering of large section tunnel, the blasting effect is closely related to the existence of ground stress. The high ground stress environment has a significant influence on the surrounding rock pressure, deformation and stability of deep buried tunnel. In order to explore the dynamic response of the ground stress to the rock mass near the tunnel and the damage evolution distribution of the tunnel face during the blasting of the large section tunnel, the constitutive model was established by the large-scale finite element simulation software ANSYS / LS-DYNA, and the numerical calculations were performed for four working conditions of no ground stress and three different ground stresses. The results show that the peak values of effective stress and vibration velocity at the vault position are the largest under different working conditions, indicating that the vault is the most dangerous position of the tunnel excavation face. When there is no ground stress, the damage depth in the middle of the floor is the largest, which is 3.84 cm. The ground stress inhibits the blasting effect to a certain extent.