Krukovskyi O.P., Kurnosov S.A., Bulich Yu.Yu., Opryshko Yu.S., Zemliana Yu.V., Yastrub R.I. Experimental and industrial test of the combined method for gate roadway supporting

Details
Parent Category: Geo-Technical Mechanics, 2020
Category: Geo-Technical Mechanics, 2020, № 150

Geoteh. meh. 2020, 150, 106-115

https://doi.org/10.15407/geotm2020.150.106

 

EXPERIMENTAL AND INDUSTRIAL TEST OF THE COMBINED METHOD FOR GATE ROADWAY SUPPORTING

1Krukovskyi O.P., 1Kurnosov S.A., 1Bulich Yu.Yu., 1Opryshko Yu.S., 1Zemliana Yu.V.,  2Yastrub R.I.

1Institute of Geotechnical Mechanics named by N. Poliakov of National Academy of Sciences of Ukraine, 2Mine “Lisova” SE “Lvivvugillia”

UDC 622.268.6

Language: Ukrainian

Annotation.

Technological process of the coal seam mining requires removing of supports installed under the worked-out rocks in the roof, which leading, as a result, to their stratification and asymmetric load on the mine working support, which negatively affects its condition. The IGTM of NAS of Ukraine developed a method for supporting the gate roadways by a concrete packed supporting wall. Among its advantages are profitability, no technological gap between the wall and the roof, water supply directly to the packages with dry cement-mineral mixture. Concrete supporting walls, for all their merits, are more expensive than the wooden ones. Therefore, they are used mainly for mining coal seams with hard-to-caving roofs. If the roof is classified as medium- and easy-to-caving, maximum load on the supporting wall is less. For such conditions, a combined method was developed for supporting the gate roadways. The idea of the method is to alternate sections of packages filled with quick-hardening mineral mixture, and sections of wooden bars stacked in layers.  The aim of this research was to conduct experimental and in-filed tests of this combined method for supporting the gate roadways. These tests were carried out during mining the Sokalsky coal seam in the Lesnaya Mine of the Lvivugol Public Company. In order to determine change of compression stresses in the supporting walls, pressure gauges were installed in them. The criterion for assessing the stress state of the wall stacked in layers and packed wall was their relative vertical deformation. The measurements were carried out at different distances from the longwall face and at different stages of concrete hardening. Sections with packed wall and sections with wooden bars with different length and width were tested. As a result, it is established that rational scheme is that in which length of the section is 1.0-1.5 of its width. The experimental and in-field tests of the proposed combined method have shown that its use at mining formations with medium- and easy-to-caving roof allows minimizing an area with inelastic deformations of the massif, significantly reducing economic costs of erecting the supporting walls and improving condition of the mine working support.

Keywords:

longwall-face conjugation, stress-strain state, supporting constructions, concrete packed wall.

References

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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. Poliakov 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. .

Kurnosov Serhii Anatoliiovych, Doctor of Technical Sciences (D. Sc), Senior Researcher, Senior Researcher in Department of Mineral Mining at Great Depths, Institute of Geotechnical Mechanics named by N. Poliakov 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 Yuriiovych, Master of Science, Researcher of Department of Rock Mechanics Department, Institute of Geotechnical Mechanics named by N. Poliakov of National Academy of Sciences of Ukraine (IGTM, NAS of Ukraine), Dnipro, Ukraine.

Opryshko Yurii Serhiiovych, Master of Science, Chief Technologist in the Department of Mineral Mining at Great Depths, Institute of Geotechnical Mechanics named by N. Poliakov 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. .

Zemliana Yuliia Valeriivna, Master of Science, Chief technologist in Department of Rock Mechanics Department, M.S. Poliakov Institute of Geotechnical Mechanics NAS of Ukraine (IGTM, NAS of Ukraine), Dnepr, Ukraine.

Yastrub Ruslan Ihorovych, Master of Science, Chief of shift for the production of mine «Lisova», SE «Lvivvugillia», Chervonograd, Ukraine.