Gas-dynamic roof fall during the potash deposits development
In the development of practically all potash salt deposits, the study of gas-dynamic phenomena (GDP) is one of the most difficult tasks to ensure mining safety. Sudden salt and gas outbursts, dynamic breakdown, which are accompanied by intense gas release and possible broken rock carry-over into the...
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| Format: | Article |
| Language: | English |
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Saint-Petersburg Mining University
2020-12-01
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| Series: | Записки Горного института |
| Subjects: | |
| Online Access: | https://pmi.spmi.ru/index.php/pmi/article/view/13326?setLocale=en_US |
| _version_ | 1797947230918803456 |
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| author | Alexander A. Baryakh Sergei S. Andreiko Anton K. Fedoseev |
| author_facet | Alexander A. Baryakh Sergei S. Andreiko Anton K. Fedoseev |
| author_sort | Alexander A. Baryakh |
| collection | DOAJ |
| description | In the development of practically all potash salt deposits, the study of gas-dynamic phenomena (GDP) is one of the most difficult tasks to ensure mining safety. Sudden salt and gas outbursts, dynamic breakdown, which are accompanied by intense gas release and possible broken rock carry-over into the mine workings, are associated with GDP. Geological preconditions for the GDP development are often the layered structure of the salt rock mass, the presence of interlayers and layers of salt clays.
For the conditions of the Usolsky potash plant mine, complex studies of factors that characterize the possibility of gas-dynamic roof fall of the stoping rooms were carried out. In mine studies, free gases pressure and the initial velocity of gas release in the rocks of the roof workings were determined. The obtained experimental estimations were used as a parametric basis for mathematical modeling of geomechanical processes under conditions of a near-contact accumulation of free gas.
The deformation of a layered salt mass produced by a room development system was described by the model of an ideal elastic-plastic medium with internal friction. The parabolic envelope of Mohr circles was used as a plasticity criterion in the compression area. In the numerical implementation, the deformation of clay contacts was modeled by Goodman contact elements. Based on the results of multivariate numerical calculations, it is established that the main factors determining the possibility of implementing GDP are the additional gas pressure at the contact, the width of the workingspan, and the distance from the roof to the first gas-containing contact. With multi-level lamination of roof rocks, there is a danger of large sources of GDP formation and the mechanism of successive fall of layers in an instant mode is implemented. |
| first_indexed | 2024-04-10T21:23:31Z |
| format | Article |
| id | doaj.art-03b2456f60064e6eb816c43b391d2815 |
| institution | Directory Open Access Journal |
| issn | 2411-3336 2541-9404 |
| language | English |
| last_indexed | 2024-04-10T21:23:31Z |
| publishDate | 2020-12-01 |
| publisher | Saint-Petersburg Mining University |
| record_format | Article |
| series | Записки Горного института |
| spelling | doaj.art-03b2456f60064e6eb816c43b391d28152023-01-20T02:04:53ZengSaint-Petersburg Mining UniversityЗаписки Горного института2411-33362541-94042020-12-0124660160910.31897/PMI.2020.6.113326Gas-dynamic roof fall during the potash deposits developmentAlexander A. Baryakh0https://orcid.org/0000-0003-2737-6166Sergei S. Andreiko1https://orcid.org/0000-0002-3524-8650Anton K. Fedoseev2https://orcid.org/0000-0002-9292-1602Institute of the Ural branch of the Russian Academy of SciencesPerm National Research Polytechnic UniversityMining Institute of the Ural branch of the Russian Academy of SciencesIn the development of practically all potash salt deposits, the study of gas-dynamic phenomena (GDP) is one of the most difficult tasks to ensure mining safety. Sudden salt and gas outbursts, dynamic breakdown, which are accompanied by intense gas release and possible broken rock carry-over into the mine workings, are associated with GDP. Geological preconditions for the GDP development are often the layered structure of the salt rock mass, the presence of interlayers and layers of salt clays. For the conditions of the Usolsky potash plant mine, complex studies of factors that characterize the possibility of gas-dynamic roof fall of the stoping rooms were carried out. In mine studies, free gases pressure and the initial velocity of gas release in the rocks of the roof workings were determined. The obtained experimental estimations were used as a parametric basis for mathematical modeling of geomechanical processes under conditions of a near-contact accumulation of free gas. The deformation of a layered salt mass produced by a room development system was described by the model of an ideal elastic-plastic medium with internal friction. The parabolic envelope of Mohr circles was used as a plasticity criterion in the compression area. In the numerical implementation, the deformation of clay contacts was modeled by Goodman contact elements. Based on the results of multivariate numerical calculations, it is established that the main factors determining the possibility of implementing GDP are the additional gas pressure at the contact, the width of the workingspan, and the distance from the roof to the first gas-containing contact. With multi-level lamination of roof rocks, there is a danger of large sources of GDP formation and the mechanism of successive fall of layers in an instant mode is implemented.https://pmi.spmi.ru/index.php/pmi/article/view/13326?setLocale=en_USpotash minesgas-dynamic phenomenastress-strain statemathematical modelingfailure criteria |
| spellingShingle | Alexander A. Baryakh Sergei S. Andreiko Anton K. Fedoseev Gas-dynamic roof fall during the potash deposits development Записки Горного института potash mines gas-dynamic phenomena stress-strain state mathematical modeling failure criteria |
| title | Gas-dynamic roof fall during the potash deposits development |
| title_full | Gas-dynamic roof fall during the potash deposits development |
| title_fullStr | Gas-dynamic roof fall during the potash deposits development |
| title_full_unstemmed | Gas-dynamic roof fall during the potash deposits development |
| title_short | Gas-dynamic roof fall during the potash deposits development |
| title_sort | gas dynamic roof fall during the potash deposits development |
| topic | potash mines gas-dynamic phenomena stress-strain state mathematical modeling failure criteria |
| url | https://pmi.spmi.ru/index.php/pmi/article/view/13326?setLocale=en_US |
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