Abstract
In order to develop effective measures to ensure the operational condition of the development workings behind the face in the conditions of soft footwall rocks, the construction of local reinforced zones under the protection means has been proposed. The presence of such zones allows transferring the current load deep into the massif and creating a stable foundation under the protective structure. The results of researches concerning establishment of rational parameters of local reinforced zones with application of the method of finite elements, the method of experiment planning and the method of statistical processing of these results have been presented. The empirical dependence of the subsidence of the local reinforced footwall under the protection means on their load, deformation characteristics of the local reinforced zone and host rocks, width of protection means, strength of soft underlying rocks and geometric dimensions of the zone has been determined. The relative indicator of efficiency of local strengthening of a footwall which is used for determining of rational parameters of a locally reinforced zone has been offered.
Highlights
There has been a tendency in Ukraine to reduce coal consumption and switch to alternative energy sources
Making under the protection means the local reinforced zone, in which the total deformation modulus is greater than the total deformation modulus of the footwall rocks, allows preparing in advance for the protective structure a rigid base that transfers load onto the massif
It increases the resistance of the footwall rocks, reduces the subsidence of the protective means according to the level of the footwall surface and reduces the displacement of the roof rocks
Summary
There has been a tendency in Ukraine to reduce coal consumption and switch to alternative energy sources. Coal will not lose its relevance because of its strategic importance to the state, as thermal power plants account for 31% of electricity generation. It is unacceptable that a state that has its own coal resources exports it from Russia and Kazakhstan. In Kazakhstan coal still remains and will definitely remain the main source of energy in the near future, despite the fact that the country is a world leader in uranium mining [2], which has been increased several times over the past 15 years due to underground leaching [2, 3]. A considerable share of the country's export is accounted for uranium, coal and electricity. The extraction and development of mineral resources is a strategically important task for Kazakhstan and Ukraine
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