Physical and Chemical Geotechnologies

Purpose

The purpose is to substantiate the structural elements of the development system during the mining the C₄² coal seam in the conditions of the Samara mine due to the introduction of modern mining equipment.

Methodology

The research is carried out by substantiating the parameters of the stress-strain state of the rockmass during the coal mining with longwall faces in order to substantiate the structural elements of the mining system during the extraction of the C₄² coal seam in the the mine “Samara”.

Findings

In the work on the basis of analytical researches and software experiment the actual problem of substantiation of parameters of mining the C₄² coal seam in the conditions of mine “Samara” of PJSC “DTEK Pavlogradugol” is solved. The results of the analysis of the nature and forms of rock pressure in longwall faces shows necessity of the increasing speed of the face movement, the stabilizing the rocks condition of the direct roof, and the loads on the fastening of the near face space. This researches were provided in the experimental set with simulating the different mining conditions. An analytical software experiment was carried out, and the analysis of the results of which showed that the stress-strain state of the rock mass significantly affects the intensity of rock pressure in the workings. Thus, when the speed of the wallface is more than 5 m / day, the value of the reference pressure zone is about 10 m, while the physical parameters of the reference pressure zone do not change. At the same time subsidence of sections of fastening sharply decreases, that corresponds to the classical theory of formation and management of a zone of temporary reference pressure. The analysis of industrial observations established the regularity of the change in the amount of freezing of the rock console of the main roof and the load on the fastening section from the speed of movement of the clearing face in the conditions of coal seam C₄².

Keywords: сoal extraction, wallface, mechanized complex, stress-strain state of the rock mass

References

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