Tytov O.O., Haddad J.S., Sukhariev V.V. Modelling of mined rock thin layer disintegration taking into consideration its properties changing during compaction

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Parent Category: Geo-Technical Mechanics, 2019

Category: Geo-Technical Mechanics, 2019, Issue 145

Geoteh. meh. 2019, 145, 119-129

https://doi.org/10.1051/e3sconf/201910900105

Modelling of mined rock thin layer disintegration taking into consideration its properties changing during compaction

¹Tytov O.O., ²Haddad J.S., ¹Sukhariev V.V.

¹Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine, ² Al-Balqa Applied University

UDC 621.926: 622.7                                         

Language: English

Abstract.

The aim of the work is modelling of stressed condition of the loose mined rock thin layer between two parallel working plates of disintegrator, taking into consideration the dependences of the layer porosity and its side thrust coefficient on the maximum main stress value with hereditary model of deformation accumulation. Here, as the porosity decreases, the side thrust coefficient rises gradually up to one unit. The equations of extreme balance of mined rock compactable thin layer are obtained for the case of its compression with partial sliding on working surfaces. Solving of these differential equations has been provided step by step, beginning from the peripheral layer to the central axis of symmetry of the working zone. The iterative procedure has been made with specification of the layer density for each step, connected with the layer porosity and the level of maximum main stress, until the preset error has been reached. After the final distribution of stresses on the working surfaces had been determined, the total compression force on the surfaces has been calculated. It is shown, that there is no sliding of material along the working surfaces in the central area of deformed zone, unlike the peripheral area. The stresses on working surfaces have been determined in terms of quasi-two-dimensional model, which is created based on the set of linear finite elements, allowing to determine the stresses distribution on all volume of the disintegrators flat working zone. It is more acceptable and precise than simple linear model, which doesn’t take into consideration the change of stresses in the direction being perpendicular to working surfaces, because of accumulation of systematic error during the following integration. The iterative algorithm for parameters calculation of the layer stressed condition for the hypothesis of symmetric parabolic distribution of the axial normal stresses in the directions being perpendicular to the plates is developed. The distributions of the side thrust coefficient in the layer, the effective coefficient of external friction and the stresses of disintegrators working surfaces are grounded. The practical value of the research is the possibility to determine precisely the contact forces while crushing of fine-grained material taking into consideration its compactibility.

Keywords: disintegrator, loose mining rock, partial sliding, layer porosity, side thrust coefficient, finite elements, distribution of stresses.

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About the authors

Tytov Oleksandr Oleksandrovych, Candidate of Technical Sciences (Ph.D.), Associate Professor, Researcher in the Department of Mechanics of Machines and Processes of Mineral Processes, Institute of Geotechnical Mechanics named by
N. Poljakov of National Academy of Sciences of Ukraine (IGTM, NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Haddad Jamil Sami Salih, Candidate of Technical Sciences (Ph.D.), Associate Professor, Department of Mechanical Engineering, Faculty of Engineering Technology, Al-Balqa Applied University, Amman, Jordan, This email address is being protected from spambots. You need JavaScript enabled to view it.

Sukhariev Vitalii Vitaliiovych, Candidate of Technical Sciences (Ph.D.), Senior Researcher in the Department of Mechanics of Mineral Processing Machines and Processes, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine (IGTM, NAS of Ukraine), Dnipro, Ukraine This email address is being protected from spambots. You need JavaScript enabled to view it.

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