State analysis of overworked and underworked parting between contiguous seams and during their simultaneous top-down mining

M. Barabash¹

¹ LLS “DTEK Energy”, Kyiv, Ukraine

Min. miner. depos. 2016, 10(2):34-39

https://doi.org/10.15407/mining10.02.034

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ABSTRACT

Purpose. Investigating conditions of conducting and maintaining excavation works during mining of seam C¹₈ . Evaluating probability of parting rocks stability loss in terms of top-down mining of two contiguous seams in a series.

Methods. Carrying out computational experiments by finite elements method for investigation of the stress-strain state of lithological varieties of parting which is overworked and underworked by stoping on seams C₉ and C¹₈ .

Findings. The paper presents the results of the analysis of the vertical and horizontal stress components distribution zones along all the height of the parting for the rock types compiling it, treating separately the impact produced by stoping on seams and on the formation of the stress-strain state.

Originality. The research substantiates the possibility of disturbed rocks sections interlocking and formation of a single zone of softening along the thickness of parting during combined (with a certain displacement in the seam plane) top-down stoping on the series of seams C₉ and C¹₈ , which are not referred to as “adjacent seams” according to the normative documents.

Practical implications. The paper describes the possibility of the significant interrelation of contiguous seams during their simultaneous top-down stoping even if they are not related to the category of “adjacent seams”. Therefore, in severe mining and geo-logical conditions, it is recommended to estimate the probability of rocks softening along all the height of the parting.

Keywords: series of strata, top-down mining, parting, stresses, rocks softening

REFERENCES

Bondarenko, V., Kovalevs’ka, I., & Fomychov, V. (2012). Features of carrying out experiment using finite-element method at multivariate calculation of “mine massif – combined support” system. Geomechanical Processes during Underground Mining: School of Underground Mining 2012, 7-13.
https://doi.org/10.1201/b13157-3

Kovalevs’ka, I., Illiashov, M., Fomychov, V., & Chervatuk, V. (2012). The formation of the finite-element model of the system “undermined massif – support of stope”. Geomechanical Processes During Underground Mining: School of Underground Mining 2012, 73-79.
https://doi.org/10.1201/b13157-13

Kovalevs’ka, I., Vivcharenko, V., & Snigur, V. (2013). Specifics of percarbonic rock mass displacement in longwalls end areas and extraction workings. Mining of Mineral Deposits, 29-33.
https://doi.org/10.1201/b16354-7

Kovalevskaya, I. (2009). Metodologiya razrabotki metoda rascheta peremeshcheniy kontura ramnoy krepi vyemochnoy vyrabotki. Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, (11), 13-16.

Kovalevska, I., Barabash, M., & Gusiev, O. (2016). Research into stress-strain state of reinforced marginal massif of extraction mine working by combined anchoring system. Mining of Mineral Deposits, 10(1), 31-36.
https://doi.org/10.15407/mining10.01.031

Khalymendyk, Yu., & Baryshnikov, A. (2016). Substantiation of cable bolts parameters for supporting mine workings in conditions of laminated rocks. Mining of Mineral Deposits, 10(1), 9-15.
https://doi.org/10.15407/mining10.01.009

Prusek, S. (2010). Review of support systems and methods for prediction of gateroads deformation. New Techniques and Technologies in Mining, 25-35.
https://doi.org/10.1201/b11329-6

Savost’yanov, A., & Klochkov, V. (1992). Upravlenie sostoya-niem massiva gornykh porod. Kiev: Naukova dumka.

Symanovych, G., Demydov, M., & Chervatuk, V. (2013). Influence mechanism of rock mass structure forming a stress on a face support. Mining of Mineral Deposits, 77-81.
https://doi.org/10.1201/b16354-15

Timoshuk, V., Demchenko, J., & Sherstuk, Y. (2010). The role of natural and technogenic components in failure of geomechanical stability of the territories which are in the influence zone of mining objects. New Techniques and Technologies in Mining, 189-192.
https://doi.org/10.1201/b11329-31

Falshtynskyi, V., Lozynskyi, V., Saik, P., Dychkovskyi, R., & Tabachenko, M. (2016). Substantiating parameters of stratification cavities formation in the roof rocks during underground coal gasification. Mining of Mineral Deposits, 10(1), 16-24.
https://doi.org/10.15407/mining10.01.016