| Annotation |
The treatment chamber is the main element in the extraction of minerals by underground mining. In the arrays around the treatment chambers, in the process of developing deposits, sudden destruction of rock masses, rock impacts, and rock emissions into the treatment chambers often occur. These terrible events often lead to deaths and cause huge material damage. For this reason, the determination of the stress state of the arrays around the treatment chambers is an actual scientific and practical task.
An analytical model of the strain and strain state around chambers with a rectangular cross section was created and tested; the problem is solved for chambers with a 5:1 aspect ratio. The processes of calculating stress fields and the construction of stress surfaces in the Matcad software environment are performed for two variants of the action of forces. The first option is solved by the action of gravity when the camera is located at a depth of y = – 400m. In this case, Sx = – 50 MPa, Sy = – 100 MPa. In the second case, in addition to gravitational forces, the action of the tectonic force Tx = – 40MPa was taken into account.
Calculations of the contour stresses show that there are occurrences of large values of compressive stresses up to 741 MPa in two zones where the walls and roofs of the chamber are conjugated when all the columns of rocks are 100 MPa. In the areas of the roof in its middle part there are tensile stresses reaching up to 47 MPa. This fact indicates the massifs of rocks in the roof of the chamber the formation of vertical cracks, given the weak resistance of rocks to stretching. With the combined actions of gravitational and tectonic forces, the magnitude of tensile stresses decreases almost 2 times.
The presence of four concentration zones of all stress components around the chamber and tensile zones in the middle part of the chamber roof indicate the likely destruction zones of rocks around the chamber (aspect ratio equal to 5:1).
To predict the likely zones of rock destruction around the chambers, it is necessary to investigate with varying depths and the ratio of the sides of the chamber
|
| References |
1. Avershin S. G., Balalaeva S. A., Gruzdev V. N. Raspredeleniye napryazheniy vokrug gornykh vyrabotok (Distribution of stresses around mine workings). Frunze: Ilim, 1971. 130 p.
2. Aitmatov I. T., Kozhogulov K. Ch. Napryazhennoye sostoyaniye i prochnost elementov sistem razrabotok krutopadayushchikh mestorozhdeniy Sredney Azii (Stress and strength of elements of development systems for steeply dipping deposits in Central Asia). Frunze: Ilim, 1988. 123 p.
3. Botokanova B. A., Zhumabaev B. European Journal of Technical and Natural Sciences (European Journal of Technical and Natural Sciences), 2018, no. 3, pp. 16–27.
4. Jeffers G. Zemlya, yeye proiskhozhdeniye, istoriya i stroyeniye (Earth, its origin, history and structure). Moscow: Publishing house of foreign countries literature, 1960. 485 p.
5. Dinnik A. N., Morgaevsky A. B., Savin G. N. Trudy soveshchaniya po upravleniyu gornym davleniyem (Proceedings of the meeting on rock pressure management). Moscow: Publishing House of the Academy of Sciences of the USSR, 1938, pp. 7–55.
6. Erzhanov Zh. S., Aitaliev Sh. M., Masanov Zh. K. Seysmonapryazhennoye sostoyaniye podzemnykh sooruzheniy v anizotropnom sloistom massive (Seismic stress state of underground structures in an anisotropic layered massif). Alma-Ata: Science, 1980. 211 p.
7. Zhumabaev B. Raspredeleniye napryazheniy v massivah porod s goristym relyefom (Distribution of stresses in rock masses with mountainous terrain). Frunze: Ilim, 1988. 190 p.
8. Zhumabaev B., Botokanova B. A. Yestestvennyye i tehnicheskiye nauki (Natural and Technical Sciences), 2018, no. 8, pp. 235–243.
9. Kazikaev D. M. Geomekhanicheskiye protsessy pri sovmestnoy i povtornoy razrabotke rud (Geomechanical processes in the joint and re-development of ores). Moscow: Nedra, 1981. 288 p.
10. Kiryanov D. MATCAD № 14 (MATCAD No. 14). St. Petersburg: BVH-Petersburg, 2007. 682 p.
11. Kropotkin P. N., Makeev V. M. Sovremennaya tektonicheskaya aktivnost zemli i seysmichnost (Modern tectonic activity of the earth and seismicity). Moscow: Nauka, 1987, pp. 192–200.
12. Krupennikov G. A., Filatov N. A., Amusin B. Z., Barkovsky V. M. Raspredeleniye napryazheniy v porodnykh massivah (Stress distribution in rock masses). Moscow: Nedra, 1972. 144 p.
13. Kutepov V. M. Vestnik Moskovskogo universiteta. Seriya 4. Geologiya (Bulletin of the Moscow University. Series 4. Geology), 1966, no. 6, pp. 71–76.
14. Muskhelishvili N. I. Nekotoryye osnovnyye zadachi matematicheskoy teorii uprugosti (Some basic tasks of the mathematical theory of elasticity). Moscow: Nauka, 1966. 707 p.
15. Napryazhennoye sostoyaniye zemnoy kory (po izmereniyam v massivah gornykh porod) (The stress state of the earth’s crust (as measured in rock masses)) / ed. P. N. Kropotkin. Moscow: Nauka, 1973. 185 p.
16. Savin G. N. Raspredeleniye napryazheniy okolo otverstiy (The distribution of stress near the holes). Kiev: Naukova Dumka, 1968. 887 p.
17. Hast N. The measurements of rock pressure in mines (The measurements of rock pressure in mines). Stockholm, 1958. 183 p.
18. Hast N. Engineering Geology (Engineering Geology), 1967, vol. 2, no. 1, pp. 5–17. |
