Influence of heading technology on stress state of support in creepable rocks

The article addresses calculation of loads on lining in vertical mine shafts. Depending on the adopted heading technology, type of support and other parameters, the final support loading is formed. Regarding salt rocks and salt-bearing rocks, the load on the support canchange over the whole service life of an underground opening. With a view to taking a heading technology into account, a stress relaxation factor was determined numerically and analytically in vertical shaft sinking in geological conditions of the Upper Kama potassium–magnesium salt deposit. The applicability of the stress relaxation factor relations in the normative documents is discussed. Based on the curves of elastic displacements of rocks in the time interval of shaft sinking and using the predictive estimates of the further deformation, the need to calculate the values of a* with regard to the rock mass rheology is identified. Since elastic deformations over the whole life Т = 50 years of the shaft reach not more than 10% of the total deformations, the stress relaxation factor is prohibited to exceed this value. The comparative analysis of the adjusting factors a* calculated numerically and analytically is performed, and the algorithm of finding a* for the conditions of shaft sinking in creepable rocks is determined.

Kirienko Yu. A. Influence of heading technology on stress state of support in creepable rocks. MIAB. Mining Inf. Anal. Bull. 2024;(7):38-48. [In Russ]. DOI: 10.25018/ 0236_1493_2024_7_0_38.

Yu.A. Kirienko, Scientific Project Engineer, University of Science and Technology MISIS, 119049, Moscow, Russia, e-mail: 9267810740@mail.ru, ORCID ID: 0000-0002-4575-7328.

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