Mathematical Modeling a Stochastic Variation of Rock Properties at an Excavation Design

Sdvyzhkova, Olena; Babets, Dmytro; Moldabayev, Serik; Rysbekov, Kanay; Sarybayev, Madiyar

doi:10.5593/sgem2020/1.2/s03.021

Cited by 17 publications

(12 citation statements)

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“…The scientific foundations of the technology of active management of the state of the rock mass have been developed at IGTM NASU. An analytical description of the stress-strain state of the rock mass near the working excavation [4,5,[12][13][14][15][16][17][18], including taking into account: free gas in the rocks, water saturation and man-made cracks [7,[19][20][21], geological disturbances [7], extreme deformation of rocks [4,5], physicochemical destruction of coal [22] is worked out by scientists of the institute. A model, which has been verified by numerous experiments in mines, has been developed.…”

Section: Methodology Of Mathematical Modelingmentioning

confidence: 99%

New technical solutions in the field of protection and fastening of mine workings

Yalanskyi

Slashchov

Makeiev

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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The article discusses the features of fastening preparatory workings in difficult geological conditions, which are studied in three directions: improving concrete, arch and anchor fasteners with the consideration of the initial physical and mechanical properties of the rock mass; introduction of steel-polymer anchor; improvement of cast strips designs in combination with arch and anchor fasteners for reuse. Protection methods of mine workings and means of fastening often do not correspond to the peculiarities of the manifestation of rock pressure at the end sections of lavas and in zones of tectonic disturbances, as a result of which can become the main cause of the unsatisfactory state of the mine workings. Mathematical modeling of the rock massif stress-strain state has been carried out by the finite element method. Rigid and pliable cast strips, various technologies for erecting a cast strip, as well as a combination of cast strips with anchor and arch fasteners are modeled. The locations and sizes of rocks destruction zones, stresses in the rock mass for different options of fastening have been determined. The drawbacks of the existing technologies for the construction of cast strips are revealed and the factors for increasing their technical efficiency are established.

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Section: Methodology Of Mathematical Modelingmentioning

confidence: 99%

New technical solutions in the field of protection and fastening of mine workings

Yalanskyi

Slashchov

Makeiev

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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“…-investigate the regularities of volumes of mineral extraction from the rock mass. In the process of extraction, the technological parameters are individual for each case (Sala and Bieda, 2019) and have a wide range, so their exact definition significantly affects the cost of the product (Sdvyzhkova et al, 2020;Kalybekov et al, 2020;Rysbekov et al, 2022;Pysmennyi et al, 2022). Finding the values of the technological parameters of leaching is reduced to the successive execution of the following steps:…”

Section: Introductionmentioning

confidence: 99%

Simulation of Leaching Processes of Polymetallic Ores Using the Similarity Theorem

Vladyko

Maltsev

Sala

et al. 2022

MGPB

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The use of similarity theorems for simulation of the technological process of mineral extraction is considered. The list of parameters that significantly influence the process of underground leaching of minerals is defined. Using these parameters and fundamental laws of physics and chemistry, mathematical functions are determined to describe the processes’ behaviour under these conditions. The obtained mathematical functions make it possible to develop a computer model of polymetallic ores leaching. This allows for the prediction of the volume of extracted concentrate with minerals from the ore mass with the associated compounds. The obtained results of calculations showed a change in the volume of minerals extracted from the rock mass depending on the mass of the working agent, the volume of leached ore and the solvent percolation rate. The results of the research can be used at mining enterprises to extract polymetallic ores by underground leaching. Also, they allow for the estimation of the economic issues from mining the ore reserves.

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“…Numerous cases of slope failure that occurred in quarries around the world require the development of a hazard assessment system based on monitoring the sides of ore quar ries [2][3][4], as well as mathematical models for the risk evaluat ing [4,5]. The slope stability estimation is mainly carried out through a combined analysis by the methods of limit equilib rium [6,7] and numerical simulation [8,9]. The importance of accurately replicating the pit wall contour for further nu merical analysis encourages researchers to develop new ana lytical approaches to solving stability problems.…”

Section: Introductionmentioning

confidence: 99%

“…An effective tool is mathematical, in particular, numerical modeling the stress strain state (SSS) of a rock mass. The most proven option for SSS analysis is the finite element method (FEM) [1,8,11], which provides considering all the features of the rock struc ture. Many authors note that real cases of slope collapse in quarries are associated precisely with unforeseen alteration in the rock mass structure.…”

Section: Introductionmentioning

confidence: 99%

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

Aitkazinova¹,

Sdvyzhkova²,

Imansakipova³

et al. 2022

Nauk. visn. nat. hirn. univ.

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Purpose. To develop techniques for estimating the pit wall stability in terms of occurring of a zone of heavily jointed rock mass during ore mining at the Akzhal deposit (Kazakhstan), to work out measures to strengthen the rock opening and to verify the effectiveness of the developed measures. Methodology. The finite element analysis of the rock stress-strain state is implemented on the basis of the elastic-plastic model and the generalized Hoek-Brown failure criterion. The rock mass quality was assessed using the RMR and GSI rating classifications. This made it possible to simulate a zone of intense fracturing by changing the characteristics of the jointed surface. The shear strength reduction procedure was used to determine the safety factor for the quarry wall. Findings. The strain distributions in the rock mass forming the quarry wall have been obtained in terms of the Akzhal polymetallic ore deposit (Kazakhstan). The case of creating a zone of heavily jointed rocks in the area of a tectonic fault was considered. The safety factor of the quarry wall was determined under conditions of increased rock fracturing, as well as after carrying out measures to strengthen the rocks with a hardening solution. Originality. The effect of intense jointness on the pit wall stability is demonstrated. A method for the consistent evaluation of the quarry wall stability is proposed considering the change in the rock properties due to natural factors and artificial reinforcement. It is shown that a change in the joint surface quality due to the hardening injection reduces the shear strains in the sliding zone. Practical value. The pit wall stability was predicted considering the formation of a zone of intense fracturing under mining and geological conditions of the Akzhal deposit. The possibility of testing the effectiveness of rock strengthening measures based on mathematical modeling was shown.

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Mathematical Modeling a Stochastic Variation of Rock Properties at an Excavation Design

Cited by 17 publications

References 0 publications

New technical solutions in the field of protection and fastening of mine workings

New technical solutions in the field of protection and fastening of mine workings

Simulation of Leaching Processes of Polymetallic Ores Using the Similarity Theorem

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

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