Mathematical modeling the quarry wall stability under conditions of heavily jointed rocks

Aitkazinova, Sh; Sdvyzhkova, Olena; Imansakipova, Nurgul Beketovna; Babets, Dmytro; Klymenko, D. V.

doi:10.33271/nvngu/2022-6/018

Cited by 2 publications

(1 citation statement)

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“…In spite of well-developed instrumental observation methods that are considered to be a required part of the situ survey, predicting rock behavior is not always possible due to altering geological conditions, for example, near geological faults and small amplitude disjunctives [25]- [27]. The lack of "in-situ" information can be compensated by mathematical modeling of the rock mass stress-strain state [28], [29]. Numerical methods of rock mechanics have served as an effective tool for a gate road layout design at longwall mining [30], [31].…”

Section: Introductionmentioning

confidence: 99%

Multifactorial analysis of a gateroad stability at goaf interface during longwall coal mining – A case study

Babets,

Sdvyzhkova,

Hapieiev

et al. 2023

Min. miner. depos.

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Purpose. Creating a generalized algorithm to account for factors (coal seam thickness, enclosed rock mechanical properties, the dimension and bearing capacity of artificial support patterns) causing a gateroad state under the effect of longwall face and goaf. Methods. The assessment of the gateroad stability is based on numerical simulation of the rock stress-strain state (SSS). The finite element method is used to find out the changes in the SSS of surrounding rocks at various stages of longwall mining. The elastic-plastic constitutive model and Hoek-Brown failure criterion implemented in codes RS2 and RS3 (Rocscience) are applied to determine rock displacements dependently on the coal seam thickness, enclosed rock strength, width and strength of artificial support (a packwall comprised of hardening mixture “BI-lining”). To specify the mechanical properties of the packwall material a series of experimental tests were conducted. A computational experiment dealing with 81 combinations of affecting factors was carried out to estimate the roof slag and floor heaving in the gateroad behind the longwall face. A group method of data handling (GMDH ) is employed to generalize the relationships between rock displacements and affecting factors. Findings. The roof-to-floor closure in the gateroad has been determined at the intersection with the longwall face and goaf dependently on the coal seam thickness, enclosed rock strength, width of the packwall, and strength of hardening material. It is revealed that the support material gains the strength value of 30 MPa on the 3rd day from its beginning to use which is fully corresponding to the requirements of protective element bearing capacity. The possibility of using untreated mine water to liquefy the mixture is proved, that allows simplifying and optimizing the solute mixing and pumping technology. Originality. This study contributes to improving the understanding of the factors that influence the stability of underground mining operations and highlights the importance of utilizing numerical simulations in optimizing mining designs. The impact of each factor on the resulting variable (decrease in cross-section of gate road by height) based on the combinatorial algorithm of structural identification of the model is estimated as follows: the packwall width is 48%, the thickness of coal seam is 25%, the strength of enclosing rocks is 23%, and the strength of the packwall material is 4%. Practical implications. The findings provide stakeholders with a technique to determine reasonable parameters for support and protective systems, and the predictive model developed can be used to mitigate potential instability issues in longwall mining excavations. The results have implications under similar geological settings and can be valuable for mine design and optimization in other regions.

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Section: Introductionmentioning

confidence: 99%

Multifactorial analysis of a gateroad stability at goaf interface during longwall coal mining – A case study

Babets,

Sdvyzhkova,

Hapieiev

et al. 2023

Min. miner. depos.

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Raises advance using emulsion explosives

Kononenko,

Khomenko,

Kosenko

et al. 2024

E3S Web Conf.

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Using the well-known laws of the theory of elasticity and the basic principles of the quasi-static wave hypothesis of the mechanism of destruction of a solid medium by an explosion, methods have been developed for calculating the parameters of drilling and blasting (D&B) for raises advance using the methods of blast-hole and borehole charges. It has been established that the calculating D&B parameters is carried out in the same sequence as when drifting operation. To check the calculating D&B parameters using the new method during raise advance, a numerical simulation of changes in the stress-strain state of a rock mass under the influence of an explosion was carried out. According to the results of numerical simulation, the formation of zones of inelastic deformation in the face of a rising mine working under blast load, uniform grinding of the rock was obtained, which will avoid the release of oversized pieces after the explosion. The developed methodology was tested in the conditions of the “Yuvileina” mine of PJSC “Sukha Balka” during the raise advance of a 1420 m level using a sticked emulsion explosive (EE) Anemix P. Test explosions obtained good results in blasting the face of a raise, uniform crushing of the rock and a high coefficient of use of bore-holes has been established.

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Mathematical modeling the quarry wall stability under conditions of heavily jointed rocks

Cited by 2 publications

References 20 publications

Multifactorial analysis of a gateroad stability at goaf interface during longwall coal mining – A case study

Multifactorial analysis of a gateroad stability at goaf interface during longwall coal mining – A case study

Raises advance using emulsion explosives

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