Slashchov I.N., Slashchova Y.A. Study of caving zone formation in the rock massifat miningadjacent panels in the mines

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Parent Category: Geo-Technical Mechanics, 2016

Category: Geo-Technical Mechanics, 2016, Issue 128

STUDY OF CAVING ZONE FORMATION IN THE ROCK MASSIF AT MINING ADJACENT PANELS IN THE MINES

Slashchov I.N., Slashchova Y.A.

Slashchov I.N., Ph.D. (Tech.), Senior Researcher,

Slashchova Y.A., Ph.D. (Tech.), Senior Researcher

 (IGTM NAS of Ukraine)

http://www.geotm.dp.ua/attachments/article/3106/18-SLASHCHOV%20.pdf

 Abstract. The article presents the study of caving zone formation considered as a factor affecting the state of geotechnological system "rocks of adjacent panels – roof supports". The following geomechanical regularities of caving zone formation while mining the adjacent panels are established: volumes of disturbed rocks around the mine workings and the needed load-bearing capacity of the roof supports increase in direct proportion to depth, though the needed stability of the system "roof support-rock massif" is inversely proportional to the weight of broken roof rocks; in the process of adjacent longwall mining, when distance from the coal seam roof increases from 7 m to 60 m, the stress maxima reduce twice when the first longwall is mined and reduce by four times when the adjacent longwalls are mined;  in case of mining the first longwall as well as in case of mining  adjacent longwalls, volumes of rocks broken by stretching strains predominate over the volumes of rocks broken by shear deformations because overlying rocks which are initially under the action of tensile forces, hang over the mine workings, though total volume of broken rocks in case of mining the first longwall is 2-6 times less than in case of mining the adjacent longwalls; mining of adjacent longwall causes a sharp, by 3-4 times, increase of zones with broken rocks, intensive growth of which is further decrease, and speed of the rock failure is higher when the adjacent longwalls are used than when one longwall is used. The obtained scientific results are used for determining rational parameters for mining methods and increasing intensity of mining enterprise work.

Keywords: geomechanics of rock massif, caving zone, adjacent districts in mines, rock massif modeling.

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REFERENCES

1. Gallager, R. (1984), Metod konechnykh elementov. Osnovy [Finite Element Analysis. Fundamentals], Translated by Kartvelishvili, V.M., in Banichuk, N.V. (ed.), Nauka, Moscow, SU.

2. Slashchova, O.A., Slashchov, I.N. and Yalanskiy, A.A. (2014), “Features solutions for problems of geomechanical watery gas-saturated rock massif”, Geotekhnicheskaya Mekhanika [GeoTechnical Mechanics], no. 115, pp. 232-244, UA.

3. Ikonnikov, M.YU., Ikonnikov, YU.R., Slashchova, Ye.A., Slashchov, I.N. and Yalanskiy, A.A. (2015), Matematicheskoye modelirovaniye v zadachakh otsenki effektivnosti i bezopasnosti gornykh rabot [Mathematical modeling in solving problems of evaluating the efficacy and safety of mining operations], Natsionalnyy gornyy universitet, Dnipropetrovsk, UA.

4. Slashchov, I.N. (2013), “The use of information technology to increase the efficiency and safety of mining operations”, Coal of Ukraine, no. 2, pp. 40-43.

5. Yalanskiy, A.A., Sapunova, I.O., Slashchov, A.I. and Novikov, L.A. (2014), “Justification of the initial parameters for geomechanical processes modeling in problems of safety assessment of mine workings maintenance”, Geo-Technical Mechanics, no. 119, pp. 282-295.

 

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Об авторах

About the authors

Slashchov Igor Nikolaevich, Candidate of Technical Sciences (Ph.D), Senior Researcher, Senior Researcher in Department of Mineral Mining at Great Depths, M.S. Polyakov Institute of Geotechnical Mechanics under the National Academy of Science of Ukraine (IGTM, NASU), Dnepropetrovsk, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Slashchovа Yelena Anatolyevna, Candidate of Technical Sciences (Ph.D), Senior Researcher, Senior Researcher in Department of Mineral Mining at Great Depths, M.S. Polyakov Institute of Geotechnical Mechanics under the National Academy of Science of Ukraine (IGTM, NASU), Dnepropetrovsk, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

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