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

ZHOLMAGAMBETOV, Nurbek; Khalikova, Elvira; Demin, Vladimir; Balabas, Anna; Abdrashev, Rabbel; Suiintayeva, Saule

doi:10.33271/mining17.01.074

Cited by 8 publications

(8 citation statements)

References 34 publications

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“…Mine working name Conveyor drift Length, m 810 Width, m 4.5-5.12 (5.5) Height, m 3.5-4.0 Section area, m 2 12…”

Section: Table 2 Mining-technological Characteristics Of the 50 K10-1...mentioning

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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“…Mine working name Conveyor drift Length, m 810 Width, m 4.5-5.12 (5.5) Height, m 3.5-4.0 Section area, m 2 12…”

Section: Table 2 Mining-technological Characteristics Of the 50 K10-1...mentioning

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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“…However, when the working face is being mined back, the bottom plate is affected by the mining of the working face, and the stress is transferred to the deep part of the bottom plate of the working face of the roadway, which redistributes the stress in the rock surrounding the bottom plate. Then, there is a nonuniform stress field, i.e., a two-way unequal compressive stress field, in the rock surrounding the bottom plate, which results in different degrees of damage to the rock surrounding the bottom plate in different locations [6][7][8]. The damage to the bottom plate rock at different locations is caused by the nonuniform stress field.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Perimeter Rock Damage in a Bottom-Pumping Roadway under the Influence of Mining Activities and Rational Location Studies: A Case Study

Bai,

Wu,

Yang

et al. 2024

Applied Sciences

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With the aim of determining the damage characteristics and a reasonable positional arrangement of the surrounding rock in a bottom-pumping roadway influenced by mining in a high-gas mine, the boundary equation for the plastic zone of the surrounding rock in a circular roadway under an unequal compressive stress field was adopted to analyze the relationship between the distribution characteristics of the plastic zone of the bottom-pumping roadway and the stability of the rock surrounding the bottom-pumping roadway under different bidirectional stress ratios. This was carried out in the bottom-pumping roadway of the working face of Licun coal mine 3301 as the engineering background, where the nature of the coal seams mined is bituminous coal, and the absolute gas outflow is 0.5 m3/min−1. A numerical simulation was used to analyze the distribution characteristics of the surrounding rock stress and the bidirectional stress ratio, as well as the deformation and damage characteristics of the surrounding rock at different positions in the bottom-pumping roadway. A numerical simulation was applied to analyze the distribution characteristics of the surrounding rock stress and the two-way stress ratio, as well as the deformation and damage characteristics of the rock surrounding the bottom-pumping roadway when the bottom-pumping roadway was arranged in different locations. The results show that, with an increase in the bidirectional stress ratio, the plastic zone of the perimeter rock in the bottom-pumping roadway shows nonuniform “butterfly” distribution characteristics, which seriously affects the stability of the rock on the perimeter of the roadway; the stress on the bottom plate of the working face after excavation can be divided into four areas according to the size of the bidirectional stress ratio and the stress loading and unloading states. In addition, the size of the perimeter rock deformation can be sorted into four areas according to the damage range of the perimeter of the rock plastic zone in the bottom-pumping roadway. The size of the deformation in the surrounding rock can be sorted as follows: unpressurized high-stress ratio > unpressurized stress ratio stable area > pressurized low-stress ratio area > original rock stress ratio area. Accordingly, we found that the reasonable location of the bottom-pumping roadway is arranged at the 15 m position outside the hollow area below the coal pillar, along the limestone upper medium-grained sandstone layer along the bottom. The study’s results were applied to the field. The industrial experiments on the site show that the deformation of the surrounding rock is reasonable when the bottom-pumping roadway is dug along the limestone roof and arranged 15 m outside the fault of the mining hollow area below the coal pillar.

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“…The wider application of progressive and used in foreign practice anchoring is limited by the insufficient study of geomechanical processes around mine workings. From the analysis of the anchoring application, it was established [ [1], [2], [3]] that the main reasons for the decrease in the volume of anchoring of workings are: complications of mining and geological and mining engineering conditions with the transition to the depth of development more than 550 -700 m. Here, the size of the reference pressure zones in the area around the mine workings and the intensity of rock pressure manifestations in the mine workings inside the minefields have significantly increased. The cross-sectional area of mine workings, especially of longwall mine drifts, and the volumes of non-pillar protection of mine workings on the boundary with the excavated space, i.e.…”

Section: Introductionmentioning

confidence: 99%

Technological conditions for ensuring the stability of the array of enclosing rocks during the fastening of mine workings

Khalikova,

Demin,

Demina

et al. 2023

KIMS/CUMR/MShKP

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Ensuring the stability of the array of enclosing rocks during the fastening of mine workings is possible only if there is a highly efficient technology for conducting and maintaining workings. For fixing the mining, taking into account the technological stratification of coal-bearing massifs, a method using anchor fastening technology is recommended. The effect of the proposed method of fastening workings is that high reliability of fastening is ensured, and the volume of labor-intensive processes to combat the collapse and stratification of rocks is reduced. The stability of the contours of preparatory workings, taking into account their stress-strain state, depending on mining, geological, and technological factors of factors using the finite element method, is investigated. The boundaries of the area of inelastic deformations are determined by the method of successive loadings. The parameters of deformation of the lateral rocks of the mine workings from the angle of incidence of the formation and the depth of anchoring are considered.

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

Cited by 8 publications

References 34 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

Characteristics of Perimeter Rock Damage in a Bottom-Pumping Roadway under the Influence of Mining Activities and Rational Location Studies: A Case Study

Technological conditions for ensuring the stability of the array of enclosing rocks during the fastening of mine workings

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