鉱柱およびその付近の応力について

概要

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To contribute to promoting rational design of mine pillars, the stresses in and near the pillars have been analyzed by the finite element method under the assumed condition that one of the principal stresses is horizontally directed along the axes of the pillars while the others may take any direction and be of any magnitude. Model experiments have also been carried out to examine the relationship between the stresses in the pillars and the state of fracture in and near the same pillar if it occurs. From these results of the investigations the following conclusions have been drawn : (1) Sometimes tensile fracture may appear as a single crack either at two corners of an opening or at the central part of its roof and floor according to the original stress state. It seems that the tensile fracture has little connection with the collapse of the pillars. (2) As the earth pressure acting on the pillar increases, compressive fracture may occur first or shortly after the initiation of tensile cracks at the end of the pillar, and this fracture grows larger in scale with increase in the earth pressure. (3) The stress related to the collapse of the pillar may be the high compressive stress occurring at the end of the pillar. (4) For evaluation of the maximum compressive stress, the formula is presented in this paper.
社団法人日本材料学会の論文
1971-02-15