This paper proposes a new working face ventilation system: top gas tunnel small pillar outside the bottom return air laneway layout, in other words, which is gas tunnel location evolution.

Because the structural response differs with differing tunnel shape, wall rock properties, and initial stress state, the safety of the tunnel in different location should be estimated respectively.

If identified, they could assist in the preoperative evaluation of structure location and allow for postoperative assessment of reconstruction tunnel placement.