Analysis of roof bolting parameters to support inclined mine workings

The modification of the technology roof bolt supporting of mine workings in the conditions of increasing the coal mining intensity has been made. The technological schemes have been developed for the phased construction of roof bolting and frame support. This schemes make it possible to temporarily postpone the setting of frames in the mine working face, reduce the time and labour intensity for covering with a grid of the mine working arch and setting the bolts, as well as to increase the safety. The analysis of changes in the stress state of the border massif during the phased construction of roof bolting and frame support has been made. It is shown that the technology of phased construction of roof bolting and frame support ensures the maintaining a stable state of host rocks. In addition, the time between the extraction of the coal-rock mass and the setting of the primary support, as well as the distance between the face and the first row of roof bolts has been reduced to a minimum. The suggested approach makes possible to ensure the rate of preparatory mine workings development that are necessary for the intensification coal mining.

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Combined Roof-Bolting Systems of Mine Workings: Monograph

10.1201/9781003081432 ◽

2020 ◽

Author(s):

V. Bondarenko ◽

I. Kovalevska ◽

H. Symanovych ◽

M. Barabash ◽

V. Chervatiuk ◽

...

Keyword(s):

Roof Bolting ◽

Mine Workings

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DETERMINING THE PATTERNS OF STABILITY OF MINE WORKINGS FOR CALCULATION ROOF BOLTING PARAMETERS

Geoengineering ◽

10.20535/2707-2096.6.2021.241795 ◽

2021 ◽

pp. 9-16

Author(s):

S. Barsukov ◽

А.Т. Batyrkhanova ◽

Vladimir Dyomin

Keyword(s):

Coal Seam ◽

Longwall Mining ◽

Practical Significance ◽

Roof Bolting ◽

Pull Out ◽

Deformation Processes ◽

Mine Workings ◽

The Stability ◽

Host Rocks ◽

Roof Rocks

Purpose. The published studies are aimed at determining the mechanism of deformation of the rocks of the contour around the workings in terms of the parameters of the emerging fracturing and their dependence on the indicators of the strength of the rocks and the depth of occurrence in the massif. The tasks of the study include the installation of fracture indicators, the determination of the parameters of the development of the deformation process around the working, including the effect of longwall mining and taking into account the possibility of reuse of the workings. Methodology. To solve the set tasks, the method of field observations was used together with the use of regression dependencies to determine the dependences of the parameters on the influencing factors. In addition, the method of full-scale pull-out tests of anchor support was used, which made it possible to determine the clamping forces of the anchors. Originality. In the course of the research, the dependences of stresses and deformation along the K7 coal seam in the conditions of the mine named after Kuzembaev CD JSC "ArcelorMittal Temirtau" for the massif around the mine with fastening. Rational parameters for the use of roof bolting in preparatory mine workings have been established. This type of fastening provides direct contact between rocks and lining. Analysis of the results of calculating the parameters of the roof bolting showed that to maintain the roof in the development workings, it is necessary to take into account the parameters of the roof bolting. The main parameters include the length of the anchors, the total resistance of the roof bolting and the density of the anchors. Anchor support forms laminated rock beams in the roof rocks, which ensure the stability of the workings. Conclusions and practical significance. The results of studies devoted to the establishment of the influence of mining-geological and mining-technical factors on the formation of zones of inelastic deformation in the host rocks were considered. Significant dependences of the deformation processes of rocks in the massif around the workings were obtained, and the parabolic zone of destruction of rocks was determined. The practical significance of the research consists in determining the actual indicators of the required bearing capacity of the anchorage at two levels in the conditions of the development of the coal seam k7 of the Kuzembaev mine.

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Self-regulating roof-bolting with the rock pressure energy use

E3S Web of Conferences ◽

10.1051/e3sconf/20186000009 ◽

2018 ◽

Vol 60 ◽

pp. 00009 ◽

Cited By ~ 8

Author(s):

Oleh Khomenko ◽

Maksym Kononenko ◽

Ihor Kovalenko ◽

Denys Astafiev

Keyword(s):

Rock Pressure ◽

Energy Use ◽

Entropy Method ◽

Underground Mine ◽

Zonal Disintegration ◽

Resource Saving ◽

Roof Bolting ◽

Underground Mine Workings ◽

Mine Workings ◽

Zonal Disintegration Phenomenon

The perspective of discovery of zonal disintegration phenomenon of rocks around underground mine workings is analyzed. The methodological stages for research of this phenomenon are shown. The physics of zonal disintegration of rocks around underground mine workings is disclosed. There are described the possibilities of advanced entropy method and developed energy method that allow to investigate a phenomenon of zonal capsulation of underground mine workings. The sequence of research of this phenomenon parameters is presented. The order of choice of stable shape and resource-saving support in underground mine workings is substantiated, for the deep horizons of the Kryvorizkyi Iron-Ore Basin mines. The method of parameters calculation of self-regulating roof-bolting in underground mine workings is substantiated, which allows to use the rock pressure energy. The design of a self-regulating roof-bolting is developed, which allows applying metal, polymer and rope bolts. The economic efficiency of rock pressure energy usage is substantiated in case of support setting at great depths in underground mine workings.

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Development and Substantiation of the Parameters Calculation of the Roof Rocks Strengthening by a Combined Roof-Bolting System in the Preparatory Mine Workings

Combined Roof-Bolting Systems of Mine Workings: Monograph ◽

10.1201/9781003081432-8 ◽

2020 ◽

pp. 74-89

Author(s):

V. Bondarenko ◽

I. Kovalevska ◽

H. Symanovych ◽

M. Barabash ◽

V. Chervatiuk ◽

...

Keyword(s):

Roof Bolting ◽

Mine Workings ◽

Roof Rocks ◽

Parameters Calculation

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Method for optimizing the protecting pillars parameters in underground coal mining

E3S Web of Conferences ◽

10.1051/e3sconf/202016602009 ◽

2020 ◽

Vol 166 ◽

pp. 02009

Author(s):

Volodymyr Bondarenko ◽

Iryna Kovalevska ◽

Hennadii Symanovych ◽

Serhii Poimanov ◽

Viktor Pochepov

Keyword(s):

Computational Experiment ◽

Strain State ◽

Evidence Base ◽

Underground Coal Mining ◽

Roof Bolting ◽

Factors Analysis ◽

Geological Situation ◽

Mine Workings ◽

Enclosing Rocks ◽

Loadbearing Capacity

A method for optimizing the protecting pillars parameters during the study of soft enclosing rocks (in Ukraine mines) is represented. The necessity of a differentiated approach has been substantiated when choosing the protecting pillar parameters based on the geomechanical factors analysis influencing the state of massif. Mining and geological situation was analysed. It has been studied a stress-strain state (SSS) along the protecting pillar width with account of the mined-out space on the basis of a computational experiment and is presented in the form of curves of vertical and horizontal stresses distribution, as well as stresses intensity distribution. The recommended engineering decisions have been substantiated and the SSS of fastening and security structures has been analysed. A certain reserve of the fastening structure loadbearing capacity as part of the frame support and the combined roof-bolting system has been revealed. An evidence base has been created for the measures development on conducting and maintaining mine workings in the zone of the stope works influence. The recommendations have been developed on the protecting pillar formation with a width of at least 40 – 45 m to exclude the stope works influence.

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Numerical modeling of the stress-strain state of peripheral massif in the vicinity of mine workings

E3S Web of Conferences ◽

10.1051/e3sconf/202133001009 ◽

2021 ◽

Vol 330 ◽

pp. 01009

Author(s):

Anastasiya Nikitina ◽

Dmitriy Borzykh ◽

Sergey Rib ◽

Aleksandra Lesnykh ◽

Tonglin Zhao

Keyword(s):

Numerical Modeling ◽

Mine Working ◽

Strain State ◽

Stress Strain ◽

Roof Bolting ◽

Stress Strain State ◽

Numerical Studies ◽

Preparatory Working ◽

Mine Workings ◽

Maximum Exposure

In the process of numerical studies, the stress-strain state of the rock massif around the mine working driven at a depth of 600 m was determined. The article presents the analysis of the distribution of total vertical and horizontal stresses isolines in the working roof, as well as the ratio of the residual strength of rocks to the initial. The influence of the roof bolting on the displacement of working contour was established. Dangerous zones in the near-contour rocks of preparatory working were identified. The maximum exposure area of unsecured part of the roof during driving the workings in seam 3-3a was established.

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