Estimation of Ways to Maintain Mining Works Based on the Application of Anchor Anchoring in the Mines of the Karaganda Coal Basin

Zeynullin, Abdikarim; Abeuov, Е.A.; Демин, В. Ф.; Aliev, S.B.; Kaynazarova, Ainash; Kaynazarov, A.S.

doi:10.18796/0041-5790-2021-2-4-9

Cited by 5 publications

(5 citation statements)

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“…From the point of view of existing ideas [24]- [28] about the patterns of increase and stabilization of rock pressure manifestations in a mine working that is outside the zone of stopes influence, the methodological approach [20] is qualitatively consistent with the accumulated experience of maintaining mine workings. However, there are some comments in terms of the accepted idealization of link patterns between U and t.…”

Section: Basic Research Materialsmentioning

confidence: 92%

“…Given the widely distributed weakening factors of moisture saturation and fracturing in the coalbearing strata, the real compressive resistance of lithotypes decrease sharply [49]. To this should be added the pronounced rheological properties of most rocks [24], [29], which in total leads to a decrease in the calculated compressive resistance of the adjacent coal-bearing strata, mainly to R = 5-20 MPa. In such conditions, more intense rock pressure manifestations are quite expected.…”

Section: Figure 3 Stabilization Of the Displacement Process In The Mine Working Figure 4 Settling A Constant Gradient Of Displacement Gromentioning

confidence: 99%

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Technical and technological aspects of the coal mine closure based on the geomechanical component assessment

Barabash¹,

Salieiev²,

Symanovych³

2021

Min. miner. depos.

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Purpose.Development of a comprehensive methodology for assessing the state of mine workings based on the analysis of their contour displacement patterns when solving the problem of minimizing the risks during the closure of coal mines in Ukraine. Methods. Based on an integrated analysis of international and domestic trends when assessing the consequences of mine closure, the main provisions of using the method of instrumental mine observations have been substantiated. When solving the problem, the approaches of regulatory documents are taken into account to identify the geomechanical situation according to two conditions: the structure and strength properties of the lithotypes in the adjacent coal-bearing stratum and the peculiarities of the rheological processes manifestation during the development of its displacements. Findings. The geomechanical, technological and hydrogeological factors have been distinguished that are required to take into account when closing the coal mines. Fundamental methodological provisions have been substantiated for the most reliable assessment of the mine workings state, taking into account the long period of their operation. A criterion for making a decision on the decommissioning of mine workings or their further maintenance is presented. Originality.A series of generalizing dependences of the mine working contour displacement development has been obtained, which can be divided into four main groups according to the criteria of the structural and strength properties of lithotypes in the adjacent mass, as well as the type of their rheological manifestations: decaying and persistent deformation creep. For each group, using the methods of correlation-dispersive analysis, empirical formulas have been determined for calculating the convergence of the roof and bottom of mine workings, as well as their sides, depending on the geomechanical criterion H/R of the maintenance conditions and the duration t of this period. Practical implications.The obtained correlation ratios make it possible to predict the residual section of mine working at any time of its maintenance. They are a geomechanical component of its operational state assessment. The result of this research is the development of a new methodology for assessing the mine working state according to the patterns for predicting its contour displacement.

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Section: Basic Research Materialsmentioning

confidence: 92%

Section: Figure 3 Stabilization Of the Displacement Process In The Mine Working Figure 4 Settling A Constant Gradient Of Displacement Gromentioning

confidence: 99%

Technical and technological aspects of the coal mine closure based on the geomechanical component assessment

Barabash¹,

Salieiev²,

Symanovych³

2021

Min. miner. depos.

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“…Rock bolts are considered the main load-bearing element (which combines the layers of masses) and the shotcrete support, along with the load-bearing capacity, binds the individual rock pieces, closes the fractures tightly and prevents caving [22]- [24]. In accordance with the step of lagging behind the face, specified in the passport of fastening, the support should be timely set (Fig.…”

Section: Methodsmentioning

confidence: 99%

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

Matayev¹,

Abdiev²,

Kydrashov³

et al. 2021

Min. miner. depos.

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Purpose.Determination of the rock stability along the strike of the mass, where the drift mining of the horizon -480 m is conducted, considering the possibility of using the improved types of supports in the conditions of the 10th Anniversary of Kazakhstan’s Independence mine at the Khromtau field with the substantiation of using the effective type of fastening that increases technical and technological, operational and economic indicators of the mine. Methods. Numerical modelling of the stress-strain state of the rock mass applied at the mine have been performed using the RS2 software in a two-dimensional formulation. The rock mass state, as well as the physical-mechanical properties of mine rocks are determined according to building codes and regulations (SNiP II-94-80), depending on the category of the rock stability. Findings. It has been revealed that the combined supports from rock bolts and shotcrete are the most rational type of fastening in the studied mine. The efficiency and prospects of using the combined supports have been determined, which ensure a decrease in their material consumption and cost while increasing the reliability of mine workings and the labor productivity of miners. The use of combined support allows to increase the economy of materials for support by 1.7 times, as well as to increase the drifting rate by 1.6 times in comparison with the metal support. Originality.The paper proposes a new approach to substantiation of an effective fastening method by comparing the costs when driving horizontal underground mine workings in the mining-and-geological conditions of the 10th Anniversary of Kazakhstan’s Independence mine. Practical implications.The research results can be used when planning mining operations, in particular, stable fastening methods at the 10th Anniversary of Kazakhstan’s Independence mine of the Khromtay deposit, as well as other mining enterprises with similar mining-and-geological conditions.

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“…The most common are: increasing the accuracy of helical surfaces and surfaces of plain bearings [50][51][52], as well as laser processing of operational surfaces and grinding of threads [53,54]. Studies of metal structure [55][56][57] and diffusion processes [58][59][60] are necessary for the development of modern materials and hardening technologies. Coatings [60][61][62][63] occupy an important place among the methods of hardening and surfacing [64] and are used to provide high wear resistance of the operational surfaces of parts.…”

Section: Introductionmentioning

confidence: 99%

Influence of Heavy Weight Drill Pipe Material and Drill Bit Manufacturing Errors on Stress State of Steel Blades

et al. 2021

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Drilling volumes should be increased in order to increase hydrocarbon production, but this is impossible without the usage of high-quality drilling tools made of modern structural materials. The study has to analyze the design, technological and operational methods to increase the performance of drilling tools made of various materials and has highlighted prospects of technological method applications. The scientific novelty of the study consists in the development of a new analytical model of PDC drill bit–well interaction. The developed model takes into account the drill bit manufacturing errors in the form of bit body–nipple axes misalignment on the drill bit strength. This result makes it possible to determine the permissible manufacturing errors to provide safe operation of the drill bit. It is established that there is an additional transverse force that presses the drill bit to the well wall in the rock due to manufacturing errors. It is determined that the magnitude of this clamping force can be significant. The material effect has been analyzed on additional clamping force. It is established that geometric imperfection of the drill bit causes the minimal effect for the elastic system of the pipe string, which includes a calibrator and is composed of drill pipes based on composite carbon fiber material, and the maximal effect—for steel drill pipes. Polycrystalline diamond compact (PDC) drill bit and well wall contact interaction during operation in non-standard mode is considered. Non-standard stresses are determined, and the strength of the blades is estimated for different values of drilling bit manufacturing error.

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Estimation of Ways to Maintain Mining Works Based on the Application of Anchor Anchoring in the Mines of the Karaganda Coal Basin

Cited by 5 publications

References 0 publications

Technical and technological aspects of the coal mine closure based on the geomechanical component assessment

Technical and technological aspects of the coal mine closure based on the geomechanical component assessment

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

Influence of Heavy Weight Drill Pipe Material and Drill Bit Manufacturing Errors on Stress State of Steel Blades

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