Figure 11-1 shows the stress distribution in the surrounding rock and pillar of the inclined deposit obtained by finite element calculation.
(1) Stress concentration occurs in the upper disc corner and the lower disc corner of the mining space (mine);
(2) In the stage pillar, the stress concentration occurs in the tensile stress zone on the upper plate (Fig. 11-2a), and the tensile stress zone of the moderately upper plate is disappeared;
(3) The stress in the surrounding rock near the upper and lower plates near the recovery space is low, which is the stress reduction zone; near the stage pillar is the stress rise zone (support pressure zone).
Under the current stage height conditions (40m~60m), the stress values ​​distributed in the rock mass around the mining space are much lower than those of the upper and lower plates, so it should be stable, but from the Xiangyu area and Liaoning area. The mine pressure activity occurred in the mine shows that the rock mass destruction around the goaf is mainly due to the type of structural control failure. Our metal mines currently under rock conditions conducive to the use of room type mining method, mine pressure arising from the activities attributed almost all of the surrounding rock in mined-out area controlled by structures destroyed.
Figure 11-1 Stress distribution in surrounding rock and pillar of inclined deposit
Figure 11-2 Relationship between the stress area of ​​the disk and the stage height in the occupied space
(a) Stress distribution of the upper and lower plates when the stage height is high (the tensile stress zone is within the dotted line)
(b) The height of the stage is small, the stress distribution map of the upper and lower plates
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