Research into technology of fastening the mine workings in the conditions of unstable masses

Matayev, Azamat; Abdiev, Arstanbek; Kydrashov, Adilzhan; Musin, Aibek; Khvatina, Natalia; Kaumetova, Dinara

doi:10.33271/mining15.03.078

Cited by 17 publications

(11 citation statements)

References 14 publications

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“…In the work [4], large-scale research has been performed on the experimental study of the rock mass discontinuity around the extraction drifts and end areas of longwall faces, which are very useful for quantifying the sizes of the discontinuity areas in the coal-bearing stratum and predicting the rock pressure manifestations. The results obtained in [5], including the FEM modeling, are used to substantiate the parameters of the geomechanical models in the present research.…”

Section: Introductionmentioning

confidence: 80%

Geomechanical substantiation of parameters for safe completion of mining the coal reserves adjacent to main workings

Bondarenko¹,

Symanovych²,

Kovalevska³

et al. 2023

Nauk. visn. nat. hirn. univ.

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Purpose. Geomechanical substantiation of the parameters for conducting stope operations, ensuring the operational state of main workings. Methodology. The research is performed using an algorithm which includes the sequential execution of interrelated stages: analysis of mining-geological and mining-technical conditions for maintaining the network of main workings; mine observations of their state with the identification of specifics of rock pressure manifestations and predicting the probable negative consequences of conducting stope operations in the immediate vicinity; preliminary substantiation of possible technological options for mining the coal seam, taking into account the preservation of operational state of main workings. Scientific calculations for determining the most expedient option are based on the development of geomechanical models of the rock mass behavior around the main workings when mining the adjacent extraction site; analysis of the mass stress-strain state with the prediction of probable rock pressure manifestations; development of recommendations for limiting (or completely eliminating) the negative consequences of conducting stope operations near main workings. The above algorithm of actions uses a combination of experimental mine research methods with technologies for performing computational experiments based on the finite element method. Findings. A systematic analysis of the mining-geological and mining-technical conditions for maintaining the network of main workings has been performed, the results of which are used to substantiate ideas about the mechanism for the occurrence of specifics of rock pressure manifestations, recorded during instrumental observations of their state. Three options have been developed for completing the mining of the extraction site adjacent to the mine horizon main workings. For each of them, a geomechanical model has been constructed for calculating the stress-strain state of the adjacent coal-bearing mass. Its analysis makes it possible to formulate a number of recommendations regarding the rational parameters for conducting stope operations, as well as structural and technological solutions to increase the stability of the main workings and maintain the conditions for their safe operation. Originality. New dependences of influence of the extraction sites on the main working network stability depending on the texture and mechanical properties of lithotypes have been obtained based on the research on the stress-strain state of a weakly metamorphosed mass. For the first time, geomechanical models have been developed of the mutual influence of main workings on the parameters for conducting stope operations. Practical value. The presented recommendations simultaneously reduce the loss of coal reserves and preserve the network of main workings in proper operational state.

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Section: Introductionmentioning

confidence: 80%

Geomechanical substantiation of parameters for safe completion of mining the coal reserves adjacent to main workings

Bondarenko¹,

Symanovych²,

Kovalevska³

et al. 2023

Nauk. visn. nat. hirn. univ.

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“…Significant changes in the stress-strain state of the mass, depending on physical and mechanical properties of rocks, are proved in [26]- [30]. The study of the impact of physical and mechanical properties of rocks on the geometrical dimensions of rooms and the mining technology tailored for the conditions of the "SkhidGZK" underground mines are presented in [31]- [34].…”

Section: Research and Publications Analysismentioning

confidence: 99%

Methodology enhancement for determining parameters of room systems when mining uranium ore in the SE “SkhidGZK” underground mines, Ukraine

Stupnik¹,

Kalinichenko²,

Fedko³

et al. 2022

Min. miner. depos.

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Purpose. The present paper aims to enhance methodology for determining the safety and stability parameters of room mining systems with backfilling of the mined-out area when mining uranium ores in underground mines of the State Enterprise “Skhidnyi Mining and Beneficiation Plant” (SE “SkhidGZK”). Methods. The analytical research method used in the presented paper includes the analysis of previous relevant instructions and reports on the research performed at the SE “SkhidGZK”, as well as publications on the subject, operational geological survey documentation containing monitoring data on the stress-strain state of the rock mass surrounding the formed cavities and the actual state of the mined-out blocks in all underground mines of SE “SkhidGZK”. Findings. The research performed enables development of a new instruction for determining the safety and stability parameters of the room systems with backfilling when mining uranium ores in the SE “SkhidGZK” underground mines. Based on the developed new instruction, the stability of outcrops in mined-out rooms has been calculated, considering the actual time of their life. The obtained parameters fully correspond to actual stability of rooms in blocks of all underground mines. This indicates that the new instruction is more advanced as compared to the current Instruction and its implementation will contribute to mine safety enhancement. Originality. The increased depth of mining uranium ore in the SE “SkhidGZK” underground mines and the increase in lifetime of mined-out rooms require regular adjustment of the methodology for determining their safety and stability parameters. Based on the accumulated production experience, the observations conducted and a thorough analysis of the actual state of cavities, new and adjusted current dependences have been obtained that more accurately consider the impact of both determined factors and those unprovisioned in the current Instruction for determining the safety and stability parameters of rooms. Practical implications. The advanced methodology for determining the safety and stability parameters of room systems in comparison with the methodology described in the current Instruction at the “SkhidGZK” underground mines provides higher accuracy when determining the design parameters of rooms in the stoping blocks and greater reliability of predictive stability of both individual outcrops and rooms in general.

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“…In the previous works [12]- [15], the processes of loading the fastening systems have been substantiated and studied, as well as the mutual influence of the deformation-strength char-acteristics of the enclosing rock mass and combined fastening structures has been schematically represented. The works [16]- [19] study the issues of developing an algorithm for searching for optimal interaction modes between the fastening system and the strengthened rock mass; an algorithm has been developed that includes the following key positions:…”

Section: Algorithm For Determining the Rational Parameters Of The Fas...mentioning

confidence: 99%

Substantiating the optimization solutions for the mine working fastening system interaction with the enclosing rock mass

Symanovych¹,

Salieiev²,

Shyshov³

et al. 2022

Min. miner. depos.

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Purpose. Determination of the rational interaction modes between the fastening system and the extraction working enclosing mass in the zone of stope operations influence. Methods. An algorithm for searching for optimal solutions for the interaction modes between the fastening system and the coal-bearing mass has been substantiated. The deformation-strength characteristics of the fastening system elements have been agreed. The design parameters of the support elements have been optimized according to the criterion of their equal strength. According to the optimal parameters, a methodology for calculating the function that describes the rational deformation-strength characteristic of the fastening system, depending on the mining-geological conditions, has been developed and substantiated. Findings. Computational experiments have been conducted to determine the rock mass deformation-strength characteristic. Based on the normative documents, the sizes of the natural equilibrium arch have been calculated. The adequacy of methodical principles for minimizing the load on the fastening system has been proved. The patterns for the influence of geomechanical factors on the choice of optimal parameters of the fastening system deformation-strength characteristics have been determined. A methodology for calculating the rational parameters of the fastening system and its constituent elements has been obtained. Originality. Combined studies of minimizing the load on the fastening system have been conducted. The patterns for the influence of geomechanical factors on the choice of load-bearing capacity and the yielding property value of the fastening system have been determined. Regression equations have been obtained for calculating the fastening system optimal parameters with a geomechanical index of working conditions. This enables implementation of a unified strategy for resource-saving improvement in fastening systems. Practical implications. A methodology has been developed for obtaining the weakening mass deformation-strength characteristic, depending on the depth of mine working location, the texture of the rocks in the coal-overlaying formation and its strength properties. The applicability of the methodology for the implementation of a unified strategy of resource-saving improvement of the mine working fastening systems for the Western Donbas mines has been proved.

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Research into technology of fastening the mine workings in the conditions of unstable masses

Cited by 17 publications

References 14 publications

Geomechanical substantiation of parameters for safe completion of mining the coal reserves adjacent to main workings

Geomechanical substantiation of parameters for safe completion of mining the coal reserves adjacent to main workings

Methodology enhancement for determining parameters of room systems when mining uranium ore in the SE “SkhidGZK” underground mines, Ukraine

Substantiating the optimization solutions for the mine working fastening system interaction with the enclosing rock mass

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