Mirenkov V. E. – Institute of Mining, the Siberian Branch of RAS, Novosibirsk, the Russian Federation.
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It is well known that the bigger the working radius, the higher the possibility of fracture initiation is. The main explanation
is that the bigger the cross sectional area of the working, the higher the quantity of faults is, which lead to fracturing.
Usually stress-strained state calculation is fulfilled without taking rock dead weight into account, which increases stresses,
which initiate fracturing. For isotrope rock massif, which is weakened, for example, by the working with circular cross-
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section, during radius proportional change or boundary conditions dimensionless values are used. The change in the
radius of the working only, consequently changes the position of isolines of stressed-strained state; at that values are
preserved. Whereas the change of boundary stresses conditions only preserves the geometry, proportionally changing
the values. Phenomenological theory is suggested, which allows taking into account enclosing rock dead weight when
calculating deformation in the vicinity of a working.
Key wods: working; blasthole; fracturing; rock weight; stresses; phenomenological theory.
REFERENCES
1. Novozhilov V. V. Teoriia uprugosti [Elasticity theory]. Leningrad, Sudpromgiz Publ., 1958. 370 p.
2. Rabotnov Iu. N. Lektsii po teorii uprugosti [Lectures on elasticity theory]. Moscow, MSU Publ., 1967. 155 p.
3. Mikhlin S. G. [Regarding the stresses within rocks over the coal bed]. News of the Academy of Sciences of the USSR.
Department of Technical Sciences, 1942, no. 7–8, pp. 13–28. (In Russ.)
4. Barenblatt G. I., Khristianovich S. A. [Regarding roof collapse during mining]. News of the Academy of Sciences of
the USSR. Department of Technical Sciences, 1955, no. 11, pp. 73–86. (In Russ.)
5. Johan Cluasen. Bearing conacity of circular footing on a Hork-Brown material. Int. Journal Rock Mech. Min. Sci.,
2013, vol. 57, pp. 34–41.
6. Kurlenia M. V., Mirenkov V. E. Metody matematicheskogo modelirovaniia podzemnykh sooruzhenii [The method of
mathematical modeling of underground constructions]. Novosibirsk, Nauka Publ., 1994. 188 p.
7. Mirenkov V. E. [Deformation calculations, rock dead weight and poorly conditioned problems]. Izvestiya vysshikh
uchebnykh zavedenii. Gornyi zhurnal – News of the Higher Institutions. Mining Journal, 2016, no. 6, pp. 55–62. (In
Russ.)
8. Gritsko G. I., Posokhov G. E. and others. Gornoe davlenie na moshchnykh krutykh plastakh [Mining pressure at
powerful steep beds]. Novosibirsk, Nauka Publ., 1967. 215 p.