Mining Institute of the Ural Branch of the Russian Academy of Sciences (Perm, Russia):

Lobanov S. Yu., Scientific Fellow, Candidate of Engineering Sciences, e-mail: lserg@mi-perm.ru
Shumikhina A. Yu., Senior Scientific Fellow, Candidate of Engineering Science

Lomakin I. S., Junior Scientific Fellow

Perm National Research Polytechnic University (Perm, Russia):

Toksarov V. N., Assistent Professor, Candidate of Engineering Sciences

Evseev A. V., Scientific Fellow, Candidate of Engineering Sciences

Mining stability depends on the set of factors: mechanical properties of rocks, mining depth, size and shape of the cross-section, parameters of cleaning operations and mutual position of the workings, order of layer debugging. In the case of debugging of layers, containing seams of clay, development of roof rock deformation processes also depends on the behavior of these layers with low mechanical properties. Presence of clay in parting between layers significantly reduces the roof rocks stability, causing its intense bundle. In its turn, the parting destruction reduces the pillars bearing capacity and in some cases causes clearing works abortion. Stability of the lower workings mined layers is associated with parting stability. Parting destruction increases height of lower pillar and thus complicates its stress-strain state. This may result in partial loss of the pillars bearing capacity, up to its complete destruction. In this context, parting bearing capacity and associated with it level of pillars loading can be considered as the main factors determining the process of pillar destruction. The method for estimation of interchamber pillar loading level changing during of technological roof AB-KrII ise developed in the article; it is based on mathematic modeling of stressstrain state of double layer cell block and roof failure criteria.

The work has been made under financial support of the Presidium of the Russian Academy of Sciences (projects 12-P-5-1007) and the Russian Foundation for Basic Research (RFBR), grants 11-05-96011-r-ural_a, 12-05-31482-mol_a.

1. Asanov V. A., Toksarov V. N., Evseev A. V., Beltyukov N. L. Fiziko-tekhnicheskie problemy razrabotki poleznykh iskopaemykh – Journal of Mining Science, 2012, No. 1, pp. 84–88.
2. Baryakh A. A., Shumikhina A. Yu., Toksarov V. N., Lobanov S. Yu., Evseev A. V. Gornyi Zhurnal – Mining Journal, 2011, No. 11, pp. 15–19.
3. Zenkevich O. Metod konechnykh elementov v tekhnike (Finite element method in technics). Moscow : Mir, 1975.
4. Fadeev A. B. Metod konechnykh elementov v geomekhanike (Finite element method in hydromechanics). Moscow : Nedra, 1987.
5. Goodman R. The mechanical properties of joins. Advanced Rock Mechanics, 1974, Vol. 1, Pt A, pp. 127–140.
6. Baryakh A. A., Dudyrev I. N., Asanov V. A., Pankov I. L. Fiziko-tekhnicheskie problemy razrabotki poleznykh iskopaemykh – Journal of Mining Science, 1992, No. 2, pp. 7–11.
7. Baryakh A. A., Fedoseev A. K. Fiziko-tekhnicheskie problemy razrabotki poleznykh iskopaemykh – Journal of Mining Science, 2011, No. 4, pp. 12–22.
8. Ukazaniya po zashchite rudnikov ot zatopleniya i okhrane podrabatyvaemykh obektov v usloviyakh Verkhnekamskogo mestorozhdeniya kaliynykh soley (Regulations on protection of mines from flooding and protection of worked out objects in the conditions of Verkhnekama potassium salts deposit). Saint Petersburg, 2008.
9. Baryakh A. A., Samodelkina N. A. Fiziko-tekhnicheskie problemy razrabotki poleznykh iskopaemykh – Journal of Mining Science, 2007, No. 1, pp. 11–20.