Аn the possibility of assessing the fracturing of a rock mass based on the values of the interval velocity of three-cone drilling of explosive wells

The main structural feature of the mountain range that determines the effectiveness of its explosive destruction is fracturing. Currently, direct and indirect methods are used to determine it, which are described in detail in the article. For an adequate study of a rock mass crack, it is necessary to have at least 9 characteristics. Therefore, the search is still underway for new ways to obtain the most complete information about the cracks of the array. The article provides an overview of the state of research on a method for obtaining additional information about cracks based on data obtained from a spherical drilling rig. It is shown that the research is fragmentary, needs to be developed and verified. As a result of statistical analysis of the average values of the drilling speed of 149 wells of a large asbestos mining enterprise and on the basis of the previously proven position on the relationship between the characteristics of drilling and explosive destruction of the block, the prevailing categories of explosivity and fracture modulus are estimated. According to the diagrams of the depth of immersion of the bit during drilling of sample wells, areas with unstable walls are identified and shown in the article, indicating a possible manifestation of increased fracturing. Combining this data with a graphical representation of the drilling speed distribution between neighboring wells, obtained by interpolation averaging, made it possible to presumably determine the boundary of the spread of the zone of man-made disturbance of the upper part of the block ledge from the previous explosion in the area covering individual wells.

Regotunov A. S. Аn the possibility of assessing the fracturing of a rock mass based on the values of the interval velocity of three-cone drilling of explosive wells. MIAB. Mining Inf. Anal. Bull. 2024;(7-1):37-47. [In Russ]. DOI: 10.25018/0236_1493_2024_71_0_37.

The research was carried out within the framework of State Assignment No. 075-00412-22 PR, topics 1 (2022–2024): Methodological foundations of the strategy for the integrated development of reserves of solid minerals in the dynamics of the development of mining systems (FUWE-2022-0005), reg. No. 1021062010531-8-1.5.1.

A.S. Regotunov, Senior Researcher, Institute of Mining of the Ural Branch of the Russian Academy of Sciences, 620075, Ekaterinburg, Russia, e-mail: pochta8400@inbox.ru, ORCID ID: 0000-0002-5503-9397.

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