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INDUSTRY SAFETY AND LABOUR PROTECTION
ArticleName Undermined water-impervious strata discontinuity in potassium mines
DOI 10.17580/gzh.2019.01.15
ArticleAuthor Shhokin Yu. P.
ArticleAuthorData

VNIIG, Saint-Petersburg, Russia:

Yu. P. Shhokin, Senior Researcher, Candidate of Engineering Sciences, kopyleva@galurgy.sp.ru

Abstract

The study is concerned with the topical issues connected with the prevention of groundwater inflow in potassium mines. Five types of possible sagging of water-impervious strata–waterproof strata (WPS)–without inflow of groundwater in potassium and rock salt mines are described. The minimum size of through cracks hazardous in terms of water or brine flow from WPS to mines is estimated and analyzed. A specific emphasis is laid in water flow in crevices in swelling rocks (clay–chalky clay) typical for WPS at Starobinsk potassium salt deposit in Belarus. The experimental results on critical deformation of rocks (chalky clay, dolomite, rock salt, sylvinite) without visible fracturing are reported. According to the proposed method, comparison of these experimental data with the impermeable stratum tension strains obtained on models of equivalent materials allows judging on the presence (absence) of fracturing in undermined WPS. It is found that potassium mining by longwall method with roof caving in Soligorsk mines induces single fractures in their most hazardous echelon form in WPS (brittle dolomite layers at the interface with gypsum and calcite).

keywords Potassium mines, waterproof stratum, sagging and deformation, critical tension strains, water flow in crevices, WPS fracturing estimation
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