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ArticleName Numerical modeling of roof falls
DOI 10.17580/gzh.2019.04.05
ArticleAuthor Govorukhin Yu. M., Rib S. V., Nikitina A. M., Fryanov V. N.

Siberian State Industrial University, Novokuznetsk, Russia:

Yu. M. Govorukhin, Associate Professor, Candidate of Engineering Sciences,
S. V. Rib, Senior Lecturer
A. M. Nikitina, Associate Professor, Candidate of Engineering Sciences
V. N. Fryanov, Head of Chair, Professor, Doctor of Engineering Sciences


The modeling results are presented for the process of rock mass movement during fully mechanized longwall mining. It is found that deformations in the zone of rock movement alter gas permeability of coal, which results in formation of gas holders. Numerical modeling of geomechanical processes finds parameters of rock falls and methane-and-air flow in mined-out areas. The applied authoring bundled software Geomechanics (Geotechnology Chair, Siberian State Industrial University) makes use of the finite element method. Modeling is implemented for a mine area in the Baidai economic–geological region in Kuzbass. The scope of modeling embraces assessment of rock mass behavior in the principal profile of movement zone along trajectory of the fully-mechanized longwall. The studies determine caving steps in each layer/sublayer in the roof, which form a caving zone. It is found that fall of roof rocks in the preset conditions of the extraction site occurs in the mode of arching as the roof slab falls not to the full thickness but fails in the form gradual spalling. This approach allows predicting primary and subsequent steps of roof caving during face advance, as well as the height of the caving zone, loosening and compaction of rocks. These parameters are required for the aerodynamic resistance design in mined-out areas and for the gas-dynamic modeling of gas holder formation.

keywords Numerical modeling, geomechanical processes, extraction site, mined-out area, longwall faces, rock fall

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