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FROM THE OPERATIONAL EXPERIENCE OF THE MINING COMPANIES AND THE ORGANIZATIONS
MINING INSTITUTE, URAL BRANCH, RUSSIAN ACADEMY OF SCIENCES
ArticleName Geomechanical estimation of conditions for sinkhole formation on earth surface at the site of fresh water breakthrough into salt mine
DOI 10.17580/gzh.2018.06.03
ArticleAuthor Baryakh A. A., Devyatkov S. Yu.
ArticleAuthorData

Perm Federal Research Center, Ural Branch, Russian Academy of Sciences, Perm, Russia:

A. A. Baryakh, Director, Corresponding Member of the Russian Academy of Sciences, Doctor of Engineering Sciences

 

Mining Institute, Perm Federal Research Center, Ural Branch, Russian Academy of Sciences, Perm, Russia:
S. Yu. Devyatkov, Leading Engineer, sd@mi-perm.ru

Abstract

Salt deposit development is always associated with the risk of waterproof stratum failure resulting in hazardous fresh water inflow in mine openings. One of the main consequences of mine flooding due to high solubility of salts is the intensification of mined rock mass deformation that is frequently accompanied by sinkhole formation at the site of water breakthrough. The sinkhole formation as a phenomenon can be described as a transition of static deformation that manifests in earth surface subsidence into dynamic phase in form of failure. The sinkholes sizes could reach hundreds of meters and their formation presents real danger for life activity, leads to considerable financial losses and negative social-economic and ecological aftermaths. With the use of methods of mathematical modeling based on retrospective estimations of processes that accompanied First Berezniki Potash (BKPRU-1) mine flooding the conditions for sinkhole formation on earth surface were defined in the paper. Failure dynamics in the strata overlying salt rocks in the course of growth of a water conducting channel in the waterproof layers was studied. In all model variants, stress state of rock mass was analyzed. Failure dynamics in the strata overlying salt rocks in the course of growth of a water conducting channel in the waterproof layers was studied. In all model variants, stress state of rock mass was analyzed. Formation of the through damage zone between the ground surface and the channel was interpreted as potential transition of static deformation of the undermined rock mass into dynamic process with sinkhole generation. It is found that conditions for sinkhole at the site of fresh water breakthrough into mine are: formation of water conducting channel with a radius of 5–10 m in salt strata, deformation and the resultant decrease in strength and deformation properties in the overlying strata by factor 6 or more. In this case, the time of sinkhole formation is estimates in the range of 250–500 days.

keywords Mine flooding, sinkholes, salt dissolution, stress state, mathematical modeling, failure
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Full content Geomechanical estimation of conditions for sinkhole formation on earth surface at the site of fresh water breakthrough into salt mine
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