Evaluation of the cavity abutment zone during the mining of small and medium-sized steepfalling veins

The existing approaches to estimation of rock deformation parameters in the zone of influence of mine workings during underground mining of steeply dipping veins of small and medium thickness have been analysed. Taking into account these approaches, as well as the experience of mining operations, the linear and angular parameters of the zone of dangerous deformations in the vicinity of the mine workings were calculated. The calculated linear parameters of the zone of dangerous deformations are: in the hanging side of the vein 6 thicknesses of the vein, lying side 2.6 and in the ceiling 4 thicknesses. Estimated shear angles are 1 as follows: in case of extraction of small capacity veins δ = 75º; δ = 70º; δ1= 70º; for medium 1 capacity veins δ = 70º; δ = 65º; δ1 = 65º. The calculated parameters of the zone of dangerous deformations are proposed to be used in the construction of protection pillars for objects of II and III categories of protection at mines. Mathematical modelling by the finite element method was carried out. According to the results of modelling, the dimensions of the immediate collapse zone in the sides of the mine workings were specified as 3–5 m, regardless of the thickness of the vein. The obtained dimensions of the collapse zone are proposed to be used in calculations of the stability of preparation and cuttings with a short service life, as well as the parameters of fixing of the cleaning workings themselves.

Sosnovskaya E. L., Avdeev A. N. Evaluation of the cavity abutment zone during the mining of small and medium-sized steepfalling veins. MIAB. Mining Inf. Anal. Bull. 2024;(7-1):48-57. [In Russ]. DOI: 10.25018/0236_1493_2024_71_0_48.

The research was carried out within the framework of State Assignment No. 075-00412-22 PR, topics 3 (2022–2024). (FUWE-2022-0003), reg. No. 1021062010536-3-1.5.1.

E.L. Sosnovskaya¹, Cand. Sci. (Geol. Mineral.), Senior Researcher, ORCID ID: 0000-0003-4795-1383,
A.N. Avdeev¹, Cand. Sci. (Eng.), Senior Researcher, e-mail: avdeev0706@mail.ru, ORCID ID: 0000-0003-1023-7645,
¹ Institute of Mining of the Ural Branch of the Russian Academy of Sciences, 620075, Ekaterinburg, Russia.

A.N. Avdeev, e-mail: avdeev0706@mail.ru.

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