Krukovskyi O.P., Bulich Yu.Yu., Zemliana Yu.V. Modification of the roof bolt support technology in the conditions of increasing coal mining intensity

Details
Parent Category: Geo-Technical Mechanics, 2019
Category: Geo-Technical Mechanics, 2019, № 147

Geoteh. meh. 2019, 147, 62-72

https://doi.org/10.1051/e3sconf/201910900042

MODIFICATION OF THE ROOF BOLT SUPPORT TECHNOLOGY IN THE CONDITIONS OF INCREASING COAL MINING INTENSITY

1KrukovskyiO.P.,1BulichYu.Yu., 1ZemlianaYu.V.

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

UDC 622.281.74

Language: English

Abstract.

. At the present time, the combined roof bolt and frame supporting of mine workings is actively used in the coal mines of Ukraine in a wide range of geological conditions with almost no restrictions by the type, purpose, lifespan, section and location of mine workings in the rock massif. As was illustrated by practical experience, the high concentration of works in the mine working face constrains the rate of development, complicates the implementation of technological operations and leads to the technology violation and work safety. To ensure the intensification of mining operations, the existing technologies of the combined roof bolt and frame supporting should be improved in a such way, in order to reduce the concentration of works in mine working face, to make the primary roof bolts setting in the mine working face more convenient without violating the safety rules. The purpose of the work is to develop the technological schemes for the phased construction of bearing and roof bolt supporting of mine workings, to modify the technology roof bolt supporting of mine workings in the conditions of increasing the coal mining intensity.

The technological schemes have been developed for the phased construction of roof bolting and frame support. This schemes make it possible to temporarily postpone the setting of frames in the mine working face, reduce the time and labour intensity for covering with a grid of the mine working arch and setting the bolts, as well as to increase the safety. The analysis of changes in the stress state of the border massif during the phased construction of roof bolting and frame support has been made. It is shown that the technology of phased construction of roof bolting and frame support ensures the maintaining a stable state of host rocks. In addition, the time between the extraction of the coal-rock mass and the setting of the primary support, as well as the distance between the face and the first row of roof bolts has been reduced to a minimum. The suggested approach makes possible to ensure the rate of preparatory mine workings development that are necessary for the intensification coal mining. The new technology has been tested in the conditions of the Pavlogradska Mine and Stepna Mine, where the setting of frame supports and side roof bolts has been made with a certain lagging.

Keywords: technology roof bolt supporting, construction of roof bolting, stress state of the rocks, mine working face.

 

 

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About the authors

Krukovskyi Oleksandr Petrovych, Corresponding Member of NAS of Ukraine, Doctor of Technical Sciences (D. Sc.), Deputy Director of the Institute, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine (IGTM, NAS of Ukraine ), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Bulich Yurii Yuriovych, Master of Science, Researcher of Department of Rock Mechanics Department, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine (IGTM, NAS of Ukraine), Dnipro, Ukraine

Zemliana Yuliia Valeriivna, Master of Science, Chief Technologist in Department of Rock Mechanics Department, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine (IGTM, NAS of Ukraine), Dnipro, Ukraine