Development of methods for assessing the mine workings stability

Abdiev, Arstanbek; Mambetova, Rakhat; Abdiev, Aziz; Abdiev, Sher

doi:10.1051/e3sconf/202020101040

Cited by 14 publications

(6 citation statements)

References 20 publications

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“…The mentioned host rocks have the following main features of internal structure: it is a medium, heterogeneous in structure and properties both in space and in time. Indicators of physical properties of the massif, as a rule, are different in its different points, besides, in the same point there is anisotropy of manifestation and distribution of these indicators in space [8][9][10][11][12][13][14]. It should be noted that mechanical anisotropy is considered in this case.…”

Section: Methodsmentioning

confidence: 99%

Some results of the study of rock properties of the Sulukta deposit

Kazatov,

Raimbekov,

Bekbosunov

et al. 2023

E3S Web Conf.

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This article presents the results of research into the properties of physical and mechanical properties of rocks and their influence on the conditions of their occurrence in the coal-bearing massif, depending on the geological structure of a particular section of the rock massif and the relief of the area, to develop an experimental method of inspection of preparatory workings and the development of safety pillars. As a result of the research carried out, it was revealed that geological structures, tectonic stress fields, physical and mechanical properties of rocks and the relief of the earth surface of the deposit regularly reflect the values of shear angles, safe depth of development. These regularities can be used to forecast and estimate the boundary of the zone of dangerous influence of underground mining and the duration of the shear process. The physical and mechanical properties of rocks, determined by the depth of occurrence of rocks, tectonics and fracturing, humidity, relief of the surface of the deposit. The results of the research will allow to estimate the safe depth of underground workings, the nature and duration of rock shear processes, to reveal the zones of dangerous influence of underground workings, and will increase the efficiency of the method developed by the authors for inspection of preparatory excavations and mining of safety pillars in the conditions of the Sulukta lignite deposit. New values of physical-mechanical properties and dependences for rocks of Sulukta lignite deposit were obtained, which are valuable for designing and planning of safety pillars mining.

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Section: Methodsmentioning

confidence: 99%

Some results of the study of rock properties of the Sulukta deposit

Kazatov,

Raimbekov,

Bekbosunov

et al. 2023

E3S Web Conf.

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“…Such a solution in certain mining-andgeological conditions, ensures the maintenance of mine workings due to the use of a solidifying support, in comparison with other protecting methods. At the same time, there are still unresolved issues related to the regulation of the backfill solidifying processes and the preparation of multicomponent solidifying mixtures, as well as the influence of solidifying supports on mine workings stability [23], [24]. Proceeding from this, the backfill mass from crushed rock, as a means of restraining the displacements of side rocks, must have certain properties and characteristics.…”

Section: Recent Research and Publications Analysismentioning

confidence: 99%

Experimental characteristics for deformation properties of backfill mass

Iordanov¹,

Novikova²,

Simonova³

et al. 2020

Min. miner. depos.

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Determining the deformation properties of backfill mass used to preserve the continuity of the coal-rock stratum enclosing mine workings. Methods. To achieve the purpose set, laboratory studies have been performed on crushed rock samples with different granulometric composition, which are exposed to uniaxial compression in a steel cylinder. The experimental data are processed using the mathematical statistics methods. Findings. As a result of performed laboratory studies, it has been determined that during compression pressure of the backfill material from crushed rock, the deformation modulus is a variable value and depends on the value of the applied load, which means that it cannot be used as a physical characteristic of the backfill mass. It has been proven that the deformation modulus characterizes the backfill mass rigidity, that is, its ultimate stress state. The rigidity value under a constant external load, can be regulated using the granulometric composition of the crushed rock. It has been revealed that the maximum shrinkage of the backfill mass is achieved when repacking crushed rock fractions of different sizes under volume compression of the backfill material. In the case when the backfill material is a homogeneous fraction of crushed rock, when increasing the constrained modulus, the backfill mass rigidity increases, and shrinkage decreases. Originality. It has been proven that the values of the crushed rock compaction coefficient, which characterizes the shrinkage of the backfill mass, are correlated with a parabola and depend on the granulometric composition of the source material. With inhomogeneous granulometric composition, the compaction coefficient values are maximum, and for backfill material with the similar fraction, they decrease with a change in the bulk density of the crushed rock. Practical implications. To ensure the side rocks stability and to maintain mine workings in an operational state, it is necessary to ensure a uniform by volume granulometric composition inhomogeneity of the crushed rock. This determines the ability of the roof and bottom of the coal seam to effectively respond to the impact of external factors that are manifested in the mass of sedimentary rocks during mining operations.

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“…These studies are crucial for the development of a general concept about the "massifsupport" system interaction and surveying the optimal parameters of this interaction. This takes into account the ultimate goal, which is to ensure stability of the mine workings using cost-effective technologies [8], [9]. Even though there are geological, mining and technical factors affecting the roadways design and their maintenance [10], [11], the fas-tening process should be completely related to the geomechanics of border rock massif.…”

Section: Introductionmentioning

confidence: 99%

Development and testing of an algorithm for calculating the load on support of mine workings

Bondarenko¹,

Kovalevska²,

Cawood³

et al. 2021

Min. miner. depos.

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Purpose. The purpose is to develop the calculation methods for minimizing the load on the fastening system of the preparatory mine working in difficult mining and geological conditions of its maintenance. Methods. By analysing the multivariate computational experiments on the study of the stress-strain state of the load-bearing elements of the ‘massif – support’ system in the preparatory mine workings by means of the finite-element method, as well as mine observations and measurements of displacement in the coal-overlaying rock formation. Findings. An algorithm has been developed for searching the rational modes of the fastening system resistance and methods for minimizing the load on the support of the preparatory mine working, maintained in very complex mining and geological conditions. Originality.The methodical principles have been developed of minimizing the load on the fastening system of the preparatory mine working, which are based on the use of a combination of stress-strain state studies of the ‘massif – support’ system by means of the finite element method and provisions of normative documents for calculating the dimensions of the dome of natural equilibrium of the mine working roof rocks. Practical implications. The operation modes optimisation of the load-bearing elements interaction of the mine working fastening system reduces the material and labour costs during its construction and increases its stability during operation. Keywords: analysis, calculation, optimization, support, preparatory mine working, stope works, roof rocks, collapse

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Development of methods for assessing the mine workings stability

Cited by 14 publications

References 20 publications

Some results of the study of rock properties of the Sulukta deposit

Some results of the study of rock properties of the Sulukta deposit

Experimental characteristics for deformation properties of backfill mass

Development and testing of an algorithm for calculating the load on support of mine workings

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