Depth of Floor Failure of Stope with Medium-Thickness Coal Seam
| Autor: | Zhengfan Wei, Peili Su |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Soil Science
Aquifer 02 engineering and technology 010502 geochemistry & geophysics complex mixtures 01 natural sciences 020401 chemical engineering Mining engineering Rock mechanics Architecture otorhinolaryngologic diseases Metre Geotechnical engineering Coal 0204 chemical engineering 0105 earth and related environmental sciences geography Hydrogeology geography.geographical_feature_category business.industry Coal mining Drilling Geology respiratory system Geotechnical Engineering and Engineering Geology respiratory tract diseases business Displacement (fluid) |
| Zdroj: | Geotechnical and Geological Engineering. |
| ISSN: | 1573-1529 0960-3182 |
| DOI: | 10.1007/s10706-017-0396-4 |
| Popis: | In rock mechanics, the problem of floor failure of a coal seam must be solved for mining coal above a confined aquifer. In this study, we aim to build an analytical mechanical model of coal-seam-floor failure based on plasticity theory and the Mohr–Coulomb failure criterion. Based on an analysis of the geological and hydrological conditions in the Chenghe mining area and factors affecting water inrush from the floor of the coal seam No. 5 coal, we introduce a failure coefficient ξ for the mass of floor rock of the coal seam. We monitor floor displacement and the depth of floor failure by using a displacement meter and drilling a peep hole, respectively, in working face No. 5206 of coal seam No. 5 of the inclined shaft of the Wangcun Coal Mine in the Chenghe mining area. The results indicate a maximum floor failure of 11.5 m deep immediately under the working face. A comparison of the results of calculations with those of the in situ measurements reveals a high anastomotic degree, which provides a technical reference for determining the effective confining bed thickness for mining under pressure. This approach is expected to increase the safety of the mining process at the Dongjiahe Coal Mine and other similar mines. |
| Databáze: | OpenAIRE |
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