Deflected mode of marginal rock massif around mine working boundaries depending on anchoring parameters

Демин, В. Ф.; Fofanov, Oleg Borisovich; Demina, T V; Yavorskiy, Vadim

doi:10.1088/1757-899x/177/1/012042

Cited by 2 publications

(2 citation statements)

References 2 publications

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“…At the sites of the occurrence of thin platy argillites and carbonaceous argillites with a total thickness of no more than 0.3-0.5 m, the coal seams form a false roof. Bottom rocks are most often found to be moderately stable (46% of mine seams), less often low stable (19%) and unstable (21%), and increasingly less frequently represented by stable (14%) [43]- [45].…”

Section: Study Areamentioning

confidence: 99%

Research into mine working fastening technology in the zones of increased rock pressure behind the longwall face to ensure safe mining operations

Demin,

Khalikova,

Rabatuly

et al. 2024

Min. miner. depos.

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Purpose. The research aims to substantiate the technological solutions to ensure the rock mass stability through a rational approach to strengthening the zones of increased rock pressure behind the longwall face. Methods. To achieve the purpose set, a complex research method is used, which includes an analysis of practical experience in mining medium-thickness flat-lying coal seams, a study of the stress-strain state of rocks above the coal mass marginal area, and mine research into the influence of mining-technical factors on the state of zonal preparatory workings. Findings. The patterns of stress influence on the mine working stability have been determined depending on the mining-technological parameters of mining operations. Empirical dependences of the stress influence on the mine working stability have been revealed. The parameters of stress influence on the mine working stability have been found depending on the mining-technological parameters of mining operations. Originality. The conducted research made it possible to determine the degree of influence of mining-technical conditions of mining operations on deformations in border rocks with various types of support in extraction workings, which helps to understand the dynamics of deformation processes occurring in the coal-rock mass surrounding mine workings maintained behind the longwall face. Practical implications. The revealed deformation patterns can be used in calculating the rock pressure manifestations when conducting mine workings on deep levels under various mining-technical conditions of mining operations, which has practical significance for ensuring the stability and safety of maintaining mine workings at the stage of mining operations. The use of roof-bolt support is proposed as an effective means not only to ensure stability, but also to maintain safe operating conditions in mine workings.

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Section: Study Areamentioning

confidence: 99%

Research into mine working fastening technology in the zones of increased rock pressure behind the longwall face to ensure safe mining operations

Demin,

Khalikova,

Rabatuly

et al. 2024

Min. miner. depos.

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“…In the Karaganda coal basin mines, in this regard, the frequency of additional fastening of the maintained mine workings reaches a two-three-fold value during the operational life, and more than a quarter of them are annually repaired and subjected to a complex of work to improve their stability [26], [27]. The host rocks of the immediate roof in the coal seams are often unstable, and the immediate bottom rocks are prone to heaving.…”

Section: Introductionmentioning

confidence: 99%

Ensuring a safe geomechanical state of the rock mass surrounding the mine workings in the Karaganda coal basin, Kazakhstan

ZHOLMAGAMBETOV¹,

Khalikova²,

Demin³

et al. 2023

Min. miner. depos.

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Purpose. The research purpose is to determine the instability zones in the host rocks and the dynamics of propagation of active fracturing zones to ensure the stability of the rock mass surrounding the mine workings. Methods. The research uses a set of analytical and experimental studies to determine the dynamics of the deformation process development in the coal-rock mass surrounding the mine workings. Mathematical modeling of the stress-strain state of the rock mass surrounding the active extraction workings is performed using the numerical method of finite elements in modern AN-SYS, Mergel and KMS-III software products. Findings. The influence has been studied of the mine working section shape and the coal seam dip angle on the value of the maximum stresses that arise in the rock mass when the mine working is fastened with the roof-bolt support. The instability zones in the host rocks and the dynamics of propagation of active fracturing zones have been determined both ahead of the front of the conducted mine working and on its sides for rocks of different strength. Originality. For the conditions of the Karaganda coal basin, the dependence of a change in the development of conventional inelastic deformation zones (CIDZ) on the host rock strength has been revealed. The influence of the coal seam dip angle on the dynamics of stratifications around preparatory working has also been substantiated. In addition, new data have been obtained on the influence of the roof rock strength on the stratification of the rock mass surrounding the mine working. Practical implications. By determining instability zones in the host rocks and the dynamics of propagation of active fracturing zones, it is possible to control geomechanical processes in the border rock mass of a mine working and influence it in order to prevent the occurrence of negative rock pressure manifestations. The data obtained are the basis for the development of recommendations on the use of roof-bolting technology for fastening extraction workings to ensure their stability and reduce the cost of their operation.

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Deflected mode of marginal rock massif around mine working boundaries depending on anchoring parameters

Cited by 2 publications

References 2 publications

Research into mine working fastening technology in the zones of increased rock pressure behind the longwall face to ensure safe mining operations

Research into mine working fastening technology in the zones of increased rock pressure behind the longwall face to ensure safe mining operations

Ensuring a safe geomechanical state of the rock mass surrounding the mine workings in the Karaganda coal basin, Kazakhstan

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