On the causes of diapirs in thick lignite deposits of the South Ural basin
Abstract
Hypothesis of formation of secondary dome-shaped and ridge-shaped diapiric structures in thick lignite deposit. The hypothesis of formation of secondary dome-shaped and ridge-shaped diapiric structures in the thick lignite deposit of Babaevskoe deposit (Southern Urals) was developed earlier. In recent years, new data have been obtained that more fully characterize the structure of dome-shaped and ridge-shaped diapirs of the Babaevskoye field. Mining workings of the Kumertaussky (Ermolaevsky) coal mine have completely uncovered the coal deposit, including the “basal layer” of diapir structures, i.e., the layers located at the base of diapirs and not subject to plastic deformations. The studies of landslide phenomena at the Kumertaus coal open pit conducted in 1954-1958 by G. L. Fisenko, in particular numerous tests of the physical and mechanical properties of coals and host rocks, provide sufficient data for an approximate calculation of the possibility of plastic deformation and flow of the coal deposit layers in areas where diapiric structures develop.
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