MONITORING THE STABILITY OF VERTICAL SHAFT FOR POTASSIUM MINES

2020 ◽  
Vol 3 (1) ◽  
pp. 304-317
Author(s):  
N.M. KACHURIN ◽  
◽  
I.A. AFANASIEV ◽  
V.S. PESTRIKOVA ◽  
P.P. STAS ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Rock Mass ◽  
Strain State ◽  
Theoretical Studies ◽  
Vertical Shaft ◽  
Support Material ◽  
Safe Operation ◽  
Predictive Assessment ◽  
The Stability ◽  
Experimental And Theoretical Studies

As a result of experimental and theoretical studies, the regularities of the interaction of vertical shafts of potash mines with the rock mass were clarified, which allows predictive assessment of the consequences of violations of construction geotechnology projects and to develop effective measures to restore lining and ensure safe operation of shafts. At the same time, during the construction of vertical shafts, deviations from projects occur without modeling the possible consequences of such violations of projects. However, for a predictive assessment of the consequences of violations of construction geotechnology projects and the development of effective recommendations for the restoration and ensuring the safe operation of shafts, it is necessary to use a system of control and measuring monitoring of the support material, and mathematical modeling of its stress-strain state.

scholarly journals Numerical simulation of the stress-strain state of complex-reinforced elements

2019 ◽  
Vol 13 (2) ◽  
pp. 110-115
Author(s):  
Olena Krantovska ◽  
Mykola Petrov ◽  
Liubov Ksonshkevych ◽  
Matija Orešković ◽  
Sergii Synii ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Strain State ◽  
Theoretical Calculations ◽  
Experimental Studies ◽  
Theoretical Studies ◽  
Stress Strain ◽  
Narrow Strip ◽  
Stress Strain State ◽  
Graphical Environment ◽  
Experimental And Theoretical Studies

The article describes a developed technique of a numerical simulation of the stress-strain state of complex-reinforced elements, which allows you to create models of double-span continuous. The performed experimental and theoretical studies allowed us to carry out the testing of the developed design model and to justify the reliability of the proposed numerical simulation methodology. The results of the experimental studies were compared with those of the theoretical studies. The theoretical calculus algorithm was developed by using the finite element method. Theoretical calculations were performed by using the mathematical-graphical environment software system LIRA-SOFT and the mathematical and computer program MATLAB. On the basis of the experimental research, the iso-fields of displacements and stresses in the materials of an eccentrically compressed beam with a small bend of the slab were constructed, which collapse behind the inclined narrow strip of concrete and displacements and stresses in the materials of the eccentrically stretched beam, which is destroyed due to the yield of the upper mounting armature.

Intrinsic Defects in GaAs - the Case of El2

1987 ◽  
Vol 104 ◽  
Author(s):  
H. J. Von Bardeleben ◽  
D. Stievemard
Keyword(s):  
Electronic Structure ◽  
Stable Configuration ◽  
Theoretical Studies ◽  
Absorption Bands ◽  
Teller Distortion ◽  
Jahn Teller ◽  
The Stability ◽  
Additional Support ◽  
Jahn Teller Distortion ◽  
Experimental And Theoretical Studies

ABSTRACTThe arsenic antisite-arsenic interstitial pair model for the stable configuration of the EL2 defect in GaAs has stimulated new experimental and theoretical studies, the results of which lead to additional support for this model. Recent theoretical studies, taking into account the effect of a Jahn Teller distortion of the T2 Asi levels have given an insight into the stability and the electronic structure of the defect pair. Further, ODENDOR studies have directly confirmed this model and allowed one to specify the lattice location and the charge state of the Asi ion. The pair structure of this defect implies a reconsideration of the charge states of the EL2 defect, as well as the origin of the optical absorption bands for which transitions on the Asi ion and intracenter bands have also to be considered. The model leads further to a description of the metastable configuration : an arsenic molecule at the gallium vacancy site, the electronic structure of which is calculated. The vacancy related defects, known from electron irradiation studies, are not detected in LEC grown GaAs as native defects.

scholarly journals AX2: Type of compounds and an overview of theoretically investigated TiO2

2020 ◽  
Vol 9 (2) ◽  
pp. 79-87
Author(s):  
Dušica Jovanović ◽  
Jelena Zagorac ◽  
Branko Matović ◽  
Aleksandra Zarubica
Keyword(s):  
Band Gap ◽  
Wide Band ◽  
Theoretical Studies ◽  
Chemical Bonds ◽  
Wide Band Gap ◽  
Specific Temperature ◽  
Temperature And Pressure ◽  
The Difference ◽  
The Stability ◽  
Experimental And Theoretical Studies

AX 2-type compounds can be ionic, covalent or molecular types of structure, which depends on the size of atoms and the polarization properties. The materials of such type of the structure have different properties that can find the application in various areas of science and industry. Titanium dioxide, as a material of AX 2-type of the structure is a wide band gap semiconductor that has been widely investigated due to its photocatalytic properties and applicability for various purposes, such as the production of solar cells, decontamination of pollutants, elimination of microorganisms, suppression of cancer cells, etc. Experimental and theoretical studies of this metal oxide can give different data on the stability of individual crystalline modifications and their transitions. This study has presented an overview of theoretically examined TiO 2 modifications and current problems that can be encountered (such as various band gap values obtained by different methods and functionals; the difference between the stability of modifications examined on ab initio level and experimentally; the character of chemical bonds and transitions at the specific temperature and pressure conditions…) and overrun by optimal corrections added in calculations.

scholarly journals Analysis of activation features of geodynamic processes and formation of impact hazard at Nikolaevsk deposit

2019 ◽  
Vol 129 ◽  
pp. 01019
Author(s):  
Aleksandr Sidlyar ◽  
Boris Saksin ◽  
Marina Potapchuk ◽  
Vitaliy Usikov ◽  
Mikhail Lo-mov
Keyword(s):  
Mathematical Modeling ◽  
Rock Mass ◽  
Strain State ◽  
Acoustic Monitoring ◽  
Structural Features ◽  
Stress Fields ◽  
Joint Analysis ◽  
Safety Measures ◽  
Geodynamic Processes ◽  
The Impact

Based on the results of a joint analysis of seismic-acoustic monitoring data and the geological and structural features of the Niko-laevsk deposit, the main regularities of the formation of technogenic stress fields that determine its impact hazard have been identified. Additionally, using the method of mathematical modeling, a study was done of the stress-strain state of the rock mass taking into account the tectonically ac-tive fault TD-3 and safety measures were proposed to reduce the impact hazard of the rock mass at the Nikolaevsk deposit.

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