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The main use of concrete lining is mine and hydraulic engineering construction. The options of its use in underground structures and mining operations have been considered. The advantages of this lining during construction and operation have been reflected. A long service life of underground facilities with concrete lining in Ukraine has been noted. The typical defect types have been identified. The main reasons for defect formation have been reflected. The impact of natural factors on the deterioration of the lining has been researched. The possible consequences of the flaw growth have been reported. Limited opportunities for visual inspection of the concrete surface have been noted. The main areas of non-destructive test of linings have been analyzed. The basic set of methods and control devices have been established. Special features of monitoring with various methods have been indicated. The main requirements for the registration of primary data have been defined. Typical options of office data processing have been outlined. According to the processing results, the category of the technical condition of the lining is determined. Criteria for assessing the technical condition have been presented. Specific examples of complex examination of concrete lining have been provided.

Annotation The concept of risk-based technical solutions for the protection of coal mines workings is outlined. The initial data of effective risk management methods are substantiated. A mixed method of risks assessment has been used. The method involves building a matrix of consequences and probabilities by ranking them in the form of tables. The following data have been used as initial data: location, method and parameters of the workings protection, additional measures to manage the state of the rock mass around the workings, cost of certain types of work and material costs, purpose and term operation of the workings. Technical solutions for the protection of underground workings in coal mines to increase labor safety and reduce environmental and financial risks are substantiated. Initial data for effective methods of risks management in the protection of workings in difficult mining and technical conditions have been prepared. It is recommended to use these data as the basis of the new regulatory framework.

The results are a part of the program “Promoting the development of priority research areas” (KPKVK 6541230) of state funding for the National Academy of Sciences of Ukraine.

The work results are part of the “Theories and me-thods development for geotechnical systems state ma-nagement to ensure mines performance intensification” research under National Academy of Sciences of Ukraine funding program.

Mining technological solutions for underground mining of offbalance gypsum reserves in difficult mining and geological conditions were justified. An analysis of typical geological disturbances of gypsum seams is carried out using the Artemivsk deposit (Ukraine) as an example. Physical and mechanical properties of rocks in disturbed zones are determined. A quantitative assessment of strength characteristics of rocks during their moistening is carried out. The minimum permissible values of the width of the tape pillar and the power of the protective stack above the camera in the presence of a violation in the roof are calculated. The use of selective mining of the lower part of the seam by combines of the “Roadheader” type is recommended. The maximum width and height of the chamber are determined by the type of combine. The technology has been tested and realized at the gypsum mine of the Additional Liability Company “Siniat”.

The aim of the work is to estimate the quantities of methane contained in a coal seam as a solid coal-methane solution and adsorbed inside cracks and pores. The work uses an analytical research method based on the fundamental laws of gas and thermodynamics, as well as physical chemistry. The binding energy in the calculations is taken as averaged over the polymolecular adsorption layer. The Langmuir model to describe the process is used. It was found that the maximum possible total content of methane main phase components does not exceed 70-80 m3/ton of coal. This is significantly less than the volumes of methane that is released in the mine during the gas-dynamic phenomenon. It is concluded that a more accurate idea of the gas-dynamic and other anomalous phenomena that take place in the “coal-methane” system can be obtained only by studying its structure at the atomic-molecular level. It is also necessary to take into account the accompanying physicochemical processes arising at the stage of metamorphism and technogenic interference in the coal seam. The work is aimed at improving the theory of gas-dynamic phenomena for the effective prevention of dynamic manifestations of rock pressure in mine workings.

The results of the physical modeling of the “rock bolt – rock massif” system are presented. The characteristics of rock bolt free oscillations depending on the degree of its clamping and tension were studied on special test benches. Oscillations were caused by a single hit to the rock bolt end. It has been established, that the relaxation time of rock bolt free oscillations is the most informative parameter for non-destructive testing. Experimental dependences, that connect the informative parameter with the characteristics of the rock bolt fastening quality, have been determined. An optimal scheme for registering the oscillations in the “rock bolt – rock massif” system is proposed. The basic data has been obtained to substantiate the method of non-destructive testing the quality of rock bolt fastening.

The purpose of the work is the development and implementation of methods and monitoring equipment and diagnostics of the mine workings roof state of non-metallic deposits for providing of long safety operation of large section chambers. The task was solved by the organization and performance of geomechanical monitoring of working roofs state. Experience of a three-level system monitoring creation on the gypsum deposit in the city Bakhmut (Ukraine) is described. Monitoring included visual inspection, filing of roof deformations and vibroacoustic diagnostics. Examples of the long overseeing results by dangerous sites of the working roof are given.

The goal of the work was to develop a concept of intensification of mining operations, taking into account geomechanical processes occurring in the “rock massif – mining workings – support and protective structures” system. The article is the result of theoretical and experimental research materials analysis and synthesis, carried out for the conditions of coal, non-metallic and iron-ore mines. Positive and negative geomechanical processes and phenomena, occurring during intensification of mining operations, have been substantiated. A set of technical and technological solutions to eliminate the negative phenomena associated with high mining rates development of mineral resources has been proposed. Recommendations, presented in this article, will significantly reduce the conditionally fixed costs of mining production and improve miner’s safety.