(3) Tectonic stress in the anticlinal axis increases rapidly when the distance between the working face and the anticlinal axis is less than 20 m.
The stress state of the abutment pressure peak from numerical simulation is shown in Table 1, in which negative distance between working face and anticlinal axis indicates that the working face has advanced through the anticlinal axis, and the corresponding curve "[E.sub.0] - [E.sub.C]" is shown in Figure 10.
(3) When the distance between the working face and anticlinal axis is 4m, the residual energy "[E.sub.0] - [E.sub.C]" reaches a maximum value of 3066.17 kJ/[m.sup.3], and the risk of a rock burst is at a maximum.
During this period, the working face advances near the anticlinal axis, pushes to the axis, and eventually pushes through the axis.
(1) When the distance between the working face and the anticlinal axis exceeds 168 m, the coal in front of the working face is less affected by the anticlinial structure.