Fig. 22
Roadway surrounding rock partition control system. This picture shows the roadway perimeter rock zoning control system; according to the roadway layout and the energy-stress evolution characteristics of the perimeter rock, the 13313 backwind tunnels are divided into 3 zones. The first stage: the area within 80m from the digging face to the front of meeting is less affected by the mining stress, and the stress on both sides of the roadway is symmetrically distributed. The second stage: from 80m before meeting to 120m after meeting, the influence of mining stress on the surrounding rock is strong. In this area, the stress on both sides of the roadway gradually changes from symmetric distribution to asymmetric distribution, and the deformation damage of the right gang of the return airway is larger than that of the left gang. As the relative distance decreases, this asymmetric phenomenon becomes more and more obvious. The third stage: 120m after the intersection to the working face range, with the increase of the relative distance, the internal energy of the coal column gradually reduces and tends to be stable, the effect of mining influence is also reduced, with the appropriate support programme, it can effectively control the deformation and damage of the roadway peripheral rock.
