Baryakh A. A., Director, Doctor of Engineering Sciences, e-mail: bar@mi-perm.ru, Shumikhina A. Yu., Senior Scientific Employee, Candidate of Engineering Sciences, Toksarov V. N., Senior Scientific Employee, Candidate of Engineering Sciences, Lobanov S. Yu., Research Assistant, Candidate of Engineering Sciences Evseev A. V., Younger Research Assistant, Mining Institute of Ural Branch of RAS

Based on the study of stress-strain state of breakage headings at Verchnekamskoe potash deposit, when using the room-and-pillar system in salt rock massif characterized by bedding and abnormal claying, methods of mathematical modeling of deformation processes, criteria and characteristics of room floor and roof stability are introduced. According to the results of mathematical modeling of the stress-strain state of technological interlayers AB KrII in high argillization when sewage recess while leaving a protective costume and maintenance of the roof to collapse yielding pillars area may cover the entire roof of the reservoir Korzheva KrII. Undercut cakes causes intense destruction of the roof rocks, and can lead to complete loss of stability of technological interlayers. Regardless of the treatment plant extraction schemes increase the width of the pillars of interchamber reduces the risk of forming chambers in the top layer and shear cracks KrII separation, reduces the height of the collapse. More pronounced this is manifested in the development of the abandonment of the protective package.

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