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The paper provides a detailed analysis of innovative technologies for maintaining mine workings at great depths. The possibility of using composite materials (in particular, carbonfiber-reinforced plastic) as fastening elements is of special attention. It has been conducted a comparative analysis of the physical-mechanical properties of carbon fiber-reinforced plastic and low-alloy steel, traditionally used for the manufacture of frame support. To conduct a comparative analysis of the stress-strain state, a series of models has been developed and computer modelling has been performed by the finite element method using the Ansys Mechanical software product. In mining-geological conditions Pokrovske Mine Administration, three types of supports, namely, basic, composite with variable section and composite with constant section, have been studied. The initial and boundary conditions, as well as the assumptions and idealization of the model, have been substantiated. A comparative analysis of the stress intensity confirms the advantage of the proposed frame supports made of composite materials in terms of limiting the zones with maximum values. Laboratory research, conducted on a 3D-printer, testifies to the adequacy of conducted modelling. The reliability of the obtained values makes it possible to recommend an innovative support using carbon fiber-reinforced plastic for conducting a mine experiment.

Purpose. To analyze composite materials and prospects of their use as fastening materials for mining of coal mines.Perform a comparative analysis of the physical and mechanical properties of the innovative material carbon fiber and metallic materials, as well as compare their features. To determine the possibility of using carbon fiber as a fastening material for mining of coal mines. Research methodology. The generalization of physical and mechanical properties of carbon fiber on the basis of its analysis is performed. The features of mechanical properties of carbon fiber, steel and aluminum are compared, which showed that this composite material has the best physical and mechanical properties and it is expedient to use it in the fastening elements of mine workings. Research results. The areas of use of composite materials in industry are analyzed and generalized, and it is concluded that it is better to use carbon fiber as a fastening material for coal mine workings. A comparative analysis of the physical and mechanical properties of carbon fiber and steel is performed, which shows that this composite material has identical (and sometimes even better) properties as metallic materials. The advantages and disadvantages of carbon fiber as a fastening material for mining of coal mines are estimated. It is specified that the restraining factor, today, is the cost of carbon fiber, and later their price will decrease and demand will increase. It is concluded that when using this composite material in the fasteners of mine workings, it is possible to increase the pace of their implementation, reduce the complexity of the work performed and improve working conditions while facilitating the design. Scientific novelty. It is established that carbon fiber as a composite material can be used in the fastening elements of the preparatory workings of coal mines. Practical value. According to the results of the analysis, it is established that carbon plastics can be used in the fastening elements of mine workings, which will promote the development of underground coal mining.

This paper studies a new composite materials based on carbon fiber-reinforced plastic, which is planned to be used for supporting the preparatory workings when mining the coal at depths of more than 1000 meters. The composite material made of carbon fiber-reinforced plastic has sufficient lt high physical-mechanical properties, which are even higher than that of low-alloy steel used as the main material for supporting in coal mines. The purpose of the research is to substantiate the model of support (arched three-link) and determine its rational parameters. The calculation of the stress-strain state around mine working, using the support made of composite materials, has been perfomed based on the method of finished elements in the Solid Works software product. In addition, a model of the support for coal mines has been developed on a 3D-printer. This made it possible to conduct additional research on the interaction of the support with the rock mass. Using the Solid Works software, a detailed modeling of the composite supporting system has become possible. The stress-strain state of the rock mass has revealed that support can be used to improve the strength characteristics and prevent uneven pressure distribution around mine workings. A support made of composite materials contributes to the introduction of resource-saving technologies in the mining industry.