Krukovska V.V., Vynohradov Yu.O. Water stability influence of host rocks on the process of water filtration into mine working with frame and roof-bolting support
- Details
- Parent Category: Geo-Technical Mechanics, 2019
- Category: Geo-Technical Mechanics, 2019, Issue 147
Geoteh. meh. 2019, 147, 54-61
: https://doi.org/10.1051/e3sconf/201910900041
WATER STABILITY INFLUENCE OF HOST ROCKS ON THE PROCESS OF WATER FILTRATION INTO MINE WORKING WITH FRAME AND ROOF-BOLTING SUPPORT
1KrukovskaV.V.,2Vynohradov Yu.O.
1Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine, 2Institute for Physics of Mining Processes of National Academy of Sciences of Ukraine
UDC 622.841
Language: English
Abstract.
The strength properties of rocks may decrease when they are moistened, and as a result of their soaking, the process of border rocks destruction occurs more intensively. The water stability of mine rock is a parameter characterizing the relative change in the strength of mine rocks when saturated with water. The objective of this work is to study the water stability influence of the host rocks on the process of water filtration into mine working at different ways of its supporting. When solving the problem of water filtration in a deformable massif, the finite element method was used. The influence of the stress field on the formation of the filtration area, the influence of change in water pressure on the stress state and the decrease in the strength properties of rocks during soaking are taken into account. Four cases were considered: mine working with frame support, being driven on sandstone which belongs to the rocks with lowered water stability; mine working with roof-bolting support, being driven on the same type of sandstone; mine working with frame support, being driven on argillite, which belongs to the water-permeable rocks with water stability by 2 times lower than that of sandstone; mine working with roof-bolting support, being driven on argillite with the same properties.
The results of calculations are presented of the filtration permeability of the coal-bearing massif, the water pressure and the value of the water inflow into mine working in the cases of mining operations in sandstone and argillite. It is shown that the use of roof-bolting support prevents the development of the fractures formation process in the mine working roof, preserving the rocks in a natural, monolithic state. As a result, the process of water filtration from water bearing rock layers is constrained, which prevents or significantly reduces the soaking of border roof rocks. A decrease by 2 times in the soaking capacity factor of host rocks leads to an increase by 66 % in water inflow into mine working with frame support, and into mine working with roof-bolting support - only by 20 %. The use of roof-bolting support reduces the water inflow into mine working, located in water-stable rocks, by 2.5 times, in water-permeable rocks - by 3.4 times.
The use of roof-bolting fastening several times reduces the water inflow into mine working, located even in water-permeable rocks. The application of the roof-bolting support as a technological method for reducing the water inflow into mine workings has been substantiated.
Key words: roof-bolting support, water stability of rocks, water filtration into mine working, reduce water inflow.
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About the authors
Krukovska Viktoriia Viktorivna, Doctor of Technical Sciences (D.Sc), Senior Researcher, Senior Researcher in Department of Control of Dynamic Demonstrations of Rock Pressure, 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.
Vynohradov Yurii Oleksiiovych, Candidate of Technical Sciences (Ph.D), Junior Researcher in Department of Control of Rocks State, Institute for Physics of Mining Processes NAS of Ukraine (IPMP, NAS of Ukraine), Dnіprо, Ukraine
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