Bulat A.F., Bunko T.V., Sheyko A.V., Kokoulin I.Ye. Decrease of rock-fall risk at the mine workings driving

Details

Parent Category: Geo-Technical Mechanics, 2018

Category: Geo-Technical Mechanics, 2018, Issue 141

Geoteh. meh. 2018, 141, 134-142

https://doi.org/10.15407/geotm2018.141.134

DECREASE OF ROCK-FALL RISK AT THE MINE WORKINGS DRIVING

¹Bulat A.F., ¹Bunko T.V., ¹Sheyko A.V., ¹Kokoulin I.Ye.

¹Institute of Geotechnical Mechanics named by N. Polyakov of National Academy of Sciences of Ukraine

UDC [622.268.026.7:622.8.1/.8].002.234

Language: Ukrainian

Annotation.

Rock fall is one of the most widespread emergency situations in the coal mine (ranks second following the gas-dynamic phenomena). Specific distinction of its occurrence is predomination of human factor: it is rather caused by wrong actions of man than by mining, geological and technical factors. The most frequent reasons of the rock falls are violation of requirements of passports for supports (62%), non-compliance of passports of supports to the mining and geological conditions (8%), and absence or disrepair of supports. Such accident is characterized by considerable risks of injuring (even fatal cases) of workers and high probability of stoppage of production process. Basic trends of technical decisions made for rock fall prevention are: use of technology and equipment with reliable and maximal-by-area roof rock supporting; and complex mechanization of winning operations: roof bolting with deformation (tensions) sensors in preparatory workings and in locations of their connection with the breakage face. It is set by the mine observations that intensity of the rock falls depends on distance to support and time of its setting (time lag of support setting). For every type of rocks, time lag is specific.  It is established that the less is distance from the face to the first arch the more is time lag of support setting. The described features of processes of rock cavity and rock fall allow solving problems related to assessment and reduction of risks of the rock fall. Risk of rock fall essentially depends not only on mining and geological conditions but also on quality of blasting operations. The same conclusion can be made for other methods of the working drivage. Following the results of analysis, it is possible to calculate conditions for occurrence of emergency situation related to the rock fall and to decrease probability of people being left in the accident site of the roadways and suffering from injuring factors and to prevent their traumatism.

Keywords: risk of rock fall, breakage face, injuring of personnel, rock pressure control, estimation of risks, the risk-oriented  technology of the working drivage.

References

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About the authors

Bulat Anatoliy Fedorovych, Academician of the National Academy of Science of Ukraine, Doctor of Technical Sciences (D. Sc), Professor, Director of the Institute, Institute of Geotechnical Mechanics named by N. Polyakov of National Academy of Sciences of Ukraine (IGTM, NASU), Dnepr, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Bunko Tetyana Viktorivna,Doctor of Technical Sciences (D.Sc), Senior Researcher, Senior Reseacher in Department of Mineral Mining at Great Depths, Institute of Geotechnical Mechanics named by N. Polyakov of National Academy of Sciences of Ukraine (IGTM NASU), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. net

Sheyko Anatoliy Vasilyovych, Master of Science, Chief Technologist in Department of Underground Coal Mining, Institute of Geotechnical Mechanics named by N. Polyakov of National Academy of Sciences of Ukraine, (IGTM NASU), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Kokoulin Ivan Yevgenovych, Candidate of Technical Sciences (Ph.D.), Senior Reseacher, Senior Reseacher in Department of Mineral Mining at great depths, Institute of Geotechnical Mechanics named by N. Polyakov of National Academy of Sciences of Ukraine (IGTM NASU), Dnipro, Ukraine

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