Study on Face stability analysis of the aeolian sand tunnel

In view of the particularity of the geological environment of the surrounding rock of the aeolian sand, the tunnel will be destabilized due to its poor self-stability during tunnel excavation, which is worthy of attention. In this paper, the three-dimensional discrete element method is used to establish the discrete element numerical model of the excavation surface of the aeolian sand tunnel. The macroscopic mechanical response of the face is obtained and analysed, and the process of instability of the excavation surface is revealed from the macroscopic and microscopic mechanics. Based on this, the reasonable and safe support force of the excavation face is determined. Compared with the existing research, this paper uses the discrete element method to influence the dynamic construction of aeolian sand stratum on the stability of the face, which is closer to the engineering practice. The research results can provide reference for ensuring the stability of the tunnel face in the aeolian sand stratum.