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Загальна кількість знайдених документів : 4 Представлено документи з 1 до 4 |
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| 1. | 
Babets D. V. Estimation of rock mass stability based on probability approach and rating systems [Електронний ресурс] / D. V. Babets, О. О. Sdvyzhkova, M. H. Larionov, R. M. Tereshchuk // Науковий вісник Національного гірничого університету. - 2017. - № 2. - С. 58-64. - Режим доступу: http://nbuv.gov.ua/UJRN/Nvngu_2017_2_10 Methodology. Different types of rock mass classifications are analyzed and discussed. Advantages and disadvantages of rating systems are clarified to improve the system based on the structural factor. Statistical strength theory is used to determine the structural factor considering rock mass heterogeneity. A correspondence is set up between the structural factor and the factors reducing computed strength of rock mass obtained using Hoek-Brown's and Palstrom's approaches. Findings. Quantitative comparison of the structural factors which approximate laboratory strength evaluation to real rock mass strength and are based on different approaches is carried out. This allowed comparing the different classifications of rocks and conducting geomechanical calculations using alternative methods. The correspondence between structural factor and geological strength index is specified. This provides a possibility of designing mining excavations using a good proven generalized Hoek - Brown strength criterion considering natural and technogenic disturbance of rocks. Originality. For the first time the structural factor is represented as a piecewise monotonic function. The relationship between structural factor and Geological Strength Index and Rock Mass Index classifications for geomechanical calculations is established. The significant influence of discontinuities and the type of filler between joints on mechanical properties of a rock mass is shown. The need of considering the discontinuity surface conditions while structural factor defining is clarified. Practical value. The relation between structural factor and Geological Strength Index allows creating the technique for application of GSI rating system and Hoek - Brown failure criterion in excavation design in terms of Ukrainian mines. | ||
| 2. |
Shashenko O. M. Distribution of displacements around a single mine working driven in stratified rock mass [Електронний ресурс] / O. M. Shashenko, N. V. Khoziaikina, R. M. Tereshchuk // Науковий вісник Національного гірничого університету. - 2017. - № 6. - С. 40-46. - Режим доступу: http://nbuv.gov.ua/UJRN/Nvngu_2017_6_8 Purpose. To estimate displacements in the neighborhood of a development working driven under mining and geological conditions of mines in Western Donbas and situated within the area of mining effect for further improvement of full-scale measurements being an important stage in the process of geomechanical model verification. Methodology.A number of sequential operations of numerical modeling were involved making it possible to demonstrate deformational processes progressing in the neighborhood of "mine working-longwall" geotechnical system with a probability of 0,95 including those resulting in loss of elastoplastic complicated technical "mine working-pillar-rock mass" system being developed gradually within the rock mass. Findings. The results of the numerical experiment helped determine rules of stratified rock mass formation around a mine working located within mining space effect in terms of difference levels of protective structure rigidness within longwall as well as estimate its effect on the integrity of entire geomechanical system. Originality. For the first time the fact of both vertical and horizontal displacements of far point of deep benchmark station in the context of varying width of protective structure in longwall has been proved and their regularities have been determined. Practical value. The determined regularities can be quite useful while estimating displacements of floor rocks and roof rocks in the process of full-scale measurements performed with the help of the leveling method. | ||
| 3. |
Tereshchuk R. M. Substantiation of rational roof-bolting parameters [Електронний ресурс] / R. M. Tereshchuk, N. V. Khoziaikina, D. V. Babets // Науковий вісник Національного гірничого університету. - 2018. - № 1. - С. 19-26. - Режим доступу: http://nbuv.gov.ua/UJRN/Nvngu_2018_1_5 Purpose. To analyse a state of border rock mass of permanent slope mine working in the process of roof-bolting mounting. To determine rational roof-bolting density as well as length of anchors in the deepening process in the context of <$E m sub 4 sup 2> seam of Pioner mine ("DTEK Dobropolliavuhillia" Ltd). Methodology. Roof-bolting parameters for the permanent slope mine workings were substantiated while analysing regularities of changes in behaviour and stress-strain state of rock mass and identifying displacements of rock contour of a mine working. Thereupon, rational values of anchor lengths and roof-bolting density based upon them were determined. To analyse changes in the behaviour and stress-strain state of border rock mass of permanent inclined mine working with roof-bolting, a finite-element method was applied. Findings. A method to analyse both behaviour and stress-strain state of border rock mass of permanent inclined mine workings in the context of roof-bolting mounting has been substantiated. The procedure of the problem solution while using developed software has been described. Calculation model to solve a problem concerning the determination of rational roof-bolting density and anchor lengths to support permanent inclined mine workings in the context of their depth changes has been developed. Rational parameters of roof-bolting while supporting permanent inclined mine workings under specific mining and geological conditions have been determined. Originality. Graphs of dependences of roof rock border displacements and floor of permanent inclined mine working on its depth in terms of anchor length and roof-bolting density have been obtained. Practical value. Results of the studies may be used at the design stage to forecast displacements of a roof, a floor and walls of permanent inclined mine workings under the conditions of <$E m sub 4 sup 2> seam at Pioner mine to optimize roof-bolting parameters. | ||
| 4. | 
Tereshchuk R. Parameters of anchoring systems for fastening of inclined workings [Електронний ресурс] / R. Tereshchuk, O. Chahovets // Збірник наукових праць Національного гірничого університету. - 2019. - № 59. - С. 119-130. - Режим доступу: http://nbuv.gov.ua/UJRN/znpngu_2019_59_13 | ||
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