English：

The surrounding rock and surface structure of the shallow buried section are prone to theinfluence of blasting energy disturbance during blasting construction because of its thin covering soil.Taking the typical shallow buried section of the Sangzhi Tunnel as the research object, a three⁃dimensional numerical model was established based on FLAC3D to simulate the whole process of three⁃bench blasting construction. The results indicate that the surface settlement caused by shallow buriedthree⁃bench blasting construction is a typical trough distribution. The peak settlement is located directlyabove the tunnel axis, and the influence range is about twice the tunnel excavation span, which is highlyconsistent with the theoretical empirical formula. The blasting vibration response has typical transientcharacteristics, and the peak velocity decreases step by step from top to bottom, indicating that theblasting position and propagation path have a significant effect on energy attenuation. When the blastingface coincides with the monitoring point in the longitudinal projection, the vibration peak increasessignificantly, reflecting the near⁃field energy concentration effect, and the vibration monitoring of keypositions should be strengthened.