Identification of geodynamically active blocks structures in rock masses

The article addresses the relevant fundamental and applied problem connected with identification of interblock boundaries and assessment of their geodynamic activity during mining operations. The key subject of the field studies is Kempirsay Massif hosting chromite ore bodies now under extraction by 10 Years of Independence of Kazakhstan mine. To reveal geodynamic activity of interblock boundaries of the host rock mass, the measurements of the actual radii of Ventilation, Cage Hoist and Skip Hoist shafts during their sinking were analyzed. Based on the analysis of the measurements, the interblock boundaries were identified based on peak excesses of the radii in the test shafts over their design values. The paper presents a new criterion of self-organization of mobile blocks, which govern the risk of emergency situations in underground excavations. When the shaft foot intersects a potentially hazardous boundary between mobile blocks, stability of the bottom-hole rock mass drops, which is reflected by jumps in the rough shaft size which later on approaches gradually the design size. The degree of geodynamic activity of the intersected interblock boundary is characterized by the ratio between the gradient of jump-like increase in the shaft size and the gradient of subsequent approach to the design size.

Balek A. E., Kharisov T. F. Identification of geodynamically active blocks structures in rock masses. MIAB. Mining Inf. Anal. Bull. 2021;(5—2):30—41. [In Russ]. DOI: 10.25018/0236_1493_2021_52_0_30.

The study was carried out within the framework of State Contract No. 075-00581-19-00, Topic No. 0405-2019-0007.

Balek A. E.¹, Dr. Sci. (Eng.), Leading Researcher, Laboratory of Geomechanics of Underground Structures, е-mail: balek@igduran.ru;
Kharisov T. F.¹, Cand. Sci. (Eng.), Senior Researcher, Laboratory of Geomechanics of Underground Structures, е-mail: timur-ne@mail.ru;
¹ Institute of Mining, Ural Branch, Russian Academy of Sciences, Ekaterinburg, Russia.

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