English：

To explore the influence of different construction parameters on the excavation process of ahighway tunnel connection channel, based on the construction of an ultra⁃deep shaft connection channelin a highway, the influence law of various construction parameters is analyzed by means of fieldmonitoring and numerical simulation. The results indicate that the stress of the surrounding rock at the topof the tunnel face decreases rapidly after the excavation of the connecting passage, and the extreme pointof the stress reduction of the surrounding rock is located at the center of the top of the section. The stressof surrounding rock on both sides increases rapidly, and the stress changes of surrounding rock on bothsides are unevenly distributed. For the Grade⁃III surrounding rock excavated by using the full⁃faceblasting method, the maximum influence range of the excavation of the tunnel face on the stratum alongthe excavation direction is about 4D ( D represents the excavation step distance ). The larger theexcavation step distance, the more obvious the stress concentration in the center of the tunnel face vault.The excavation step distance should be controlled within the range of 2 ~ 3m. The influence range ofblasting dynamic load is affected by multiple factors. When the explosive in the borehole adoptsuncoupled charges, the blasting scheme can be optimized and the construction efficiency can be improvedby increasing the ratio of borehole diameter to charge diameter and appropriately increasing the maximumdetonation charge and using air gaps to buffer the energy generated by the explosion.