公路隧道爆破对隧道周围环境的影响，尤其是对衬砌结构的影响制约着爆破技术在隧道中的应用。基于衬砌结构支护理论及爆破地震波传播规律，分析了爆破地震波与衬砌结构的相互作用；结合公路隧道爆破工程实例，采用MIDAS/NX进行数值模拟，研究了爆破进尺以及喷射混凝土厚度对公路隧道衬砌结构的影响，并得出适合本工程爆破施工的爆破进尺和喷混厚度。研究结果表明： （1）当喷射混凝土厚度为0.2m时，随着爆破进尺增大，拱底隆起值与拱顶沉降值随之增大，3m进尺相对于2.5m进尺，拱底隆起值与拱顶沉降值分别增大了49.6%与49.2%。当爆破进尺为3.0m时，随着喷射混凝土厚度增大，拱底隆起值与拱顶沉降值随之减小，0.25m厚度相对于0.2m厚度，拱底隆起值与拱顶沉降值分别减小了12.7%与21.1%。 （2）当喷射混凝土厚度为0.2m，爆破进尺分别为2.5m、3.0m和3.5m时，X方向、Y方向与Z方向的最大应力变化较为显著。当爆破进尺为3.0m，喷射混凝土厚度分别为0.15m、0.20m、0.25m时，X方向、Y方向与Z方向的最大应力变化范围在10%-18%。 （3）当爆破进尺为3.0m，喷射混凝土厚度从0.15m增大至0.25m时，初衬结构上爆破振动峰值速度为12.34cm/s、7.21 cm/s、4.97 cm/s，二衬结构上爆破振动峰值速度为7.51 cm/s、3.54 cm/s、3.06 cm/s。当喷射混凝土厚度为0.2m，爆破进尺从2.5m增加至3.5m时，初衬结构上爆破振动峰值速度为5.38 cm/s、7.21 cm/s、19.3 cm/s，二衬结构上爆破振动峰值速度为2.82 cm/s、3.54 cm/s、8.02 cm/s。 研究成果为类似隧道工程的修建提供了参考和依据。

The effect of highway tunnel blasting on the surrounding environment, especially on the lining structure restricts the blasting technology in the application of the tunnel. Being based on the lining structure supporting and blasting seismic wave propagation law, summing up the interaction between the blasting seismic wave and lining structure; Combining with the highway tunnel blasting engineering instance, using the MIDAS/NX, to study the effect on the blasting footage and the thickness of sprayed concrete on the highway tunnel lining structure, and we can have the suitable parameters for the engineering instance. The results show that: (1) When blasting footage is 3.0 m, with the increasing of the thickness of sprayed concrete, arch bottom uplift and arch sedimentation value is reducing, the thickness of 0.2 m relative to 0.25m, arch bottom uplift and arch sedimentation value reduced about 14.6% and 27% respectively; When the thickness of sprayed concrete is 0.2 m, with the increasing of the blasting footage, arch bottom uplift and arch sedimentation value is also reducing, blasting footage of 3 m relative to 3.5m, arch bottom uplift and arch sedimentation value reduced about 150% and 60.6% respectively. (2) When sprayed concrete thickness is 0.2 m, the blasting footage are 2.5 m, 3.0 m and 3.5 m, the maximum stress of the direction of X , Y and Z are changing remarkable. When blasting footage is 3.0 m, the thickness of sprayed concrete are 0.15 m, 0.20 m and 0.25 m, the maximum stress of the direction of X , Y and Z are changing in the range of 10% to 18%. (3) When blasting footage is 3.0 m, the thickness of sprayed concrete increased from 0.15 m to 0.25 m, initial lining structure’s blasting vibration peak velocity is 12.34cm/s, 7.21 cm/s, 4.97 cm/s, the secondary lining structure’s blasting vibration peak velocity is 7.51 cm/s, 3.54 cm/s, 3.06 cm/s. When the thickness of sprayed concrete is 0.2m, the blasting footage increased from 2.5 m to 3.5 m, initial lining structure’s blasting vibration peak velocity is 5.38 cm/s, 7.21 cm/s, 19.3 cm/s, the secondary lining structure’s blasting vibration peak velocity is 2.82 cm/s, 3.54 cm/s, 8.02 cm/s. The research can provide the reference and the basis for the similar tunnel engineering.