The distribution of stresses in the inter-chamber pillars
Abstract
To correctly resolve the issue of the nature of the stressed state of the pillar and the deformations it experiences, it is necessary to have a correct understanding of the method of applying load to the pillar, since the latter determines the nature of the deformation – plastic or, conversely, elastic‑brittle. In addition, it should be borne in mind that the very entry into operation of new chambers, which determines the increase in the load on the pillar, does not occur immediately, but rather slowly and without jumps, but gradually. Having reached its maximum value – the full weight of the overlying rock strata – the load is not removed from the pillar, but continues to act for an indefinitely long time, which forces us to take into account the influence of time when considering the deformations of the pillar. Thus, it should be recognized that all conditions for loading interchamber pillars and the work of the load itself meet the conditions for the manifestation of plastic deformations.
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