scholarly journals FEATURES OF STRESS-STRAIN STATE OF MINE SUPPORT WHEN FILLING ROCK FALLS WITH PHENOLIC RESINS

2021 ◽  
Vol 2 (3) ◽  
pp. 266-273
Author(s):  
Andrey A. Krasnovsky
Keyword(s):  
Strain State ◽  
Rock Falls ◽  
Stress Strain ◽  
Phenolic Resins ◽  
Various Boundary Conditions ◽  
Stress Strain State ◽  
Mine Support ◽  
Geological Conditions ◽  
Calculation Results ◽  
Distribution Of Stress

The problem of finding the stress-strain state of the mine support and surrounding rocks when filling the voids with phenolic resins has been formulated and its mathematical modeling has been carried out. The pattern of distribution of stress fields in mine support and rock mass and their change depending on the geometric dimensions of the area filled with phenolic resins have been determined under various boundary conditions. It is shown that the use of phenol resins contributes to an increase in mine support stability, which allows using the developed technology for the elimination of rock caving in different mining and geological conditions. The calculation results have been discussed.

Improving Safety when Extracting Water-soluble Ores by Optimizing the Parameters of the Backfill Mass

2021 ◽  
pp. 53-59
Author(s):  
M.M. Khayrutdinov ◽  
◽  
Ch.B. Kongar-Syuryun ◽  
A.M. Khayrutdinov ◽  
Yu.S. Tyulyaeva ◽  
...  
Keyword(s):  
Strain State ◽  
Raw Materials ◽  
Research Work ◽  
Integrated Approach ◽  
Water Soluble ◽  
Mining Operations ◽  
Stress Strain ◽  
Mining System ◽  
Stress Strain State ◽  
Geological Conditions

The results of the scientific and research work devoted to modeling the stress-strain state of the mining system of an underground mine using the finite element method in the FLAC3D software are presented in the article. The possibility of using room-and-pillar mining with backfill with the abandonment of chain pillars is justified. The results are presented concerning the research results of the quantitative assessment of the mass using the von Mises equation and Norton' power law of creep to estimate the contour stress. It becomes possible to determine the sequence of mining of the deposit area and the stage-by-stage filling of the stopes at the stage of mining design due to the high accuracy of modeling the stress-strain state of the mass near mining operations using FLAC3D software. The proposed approach is possible when evaluating the geotechnical state of the rock mass when using the mining systems with various methods of support of the mined-out area: natural; artificial; with the collapse of ores and enclosing rocks, as well as when calculating the combined method of deposit development. A differentiated approach to assessing the state of the mass is possible considering difficult mining and geological conditions, conditions of increased rock pressure, abundant water influx, increased fracturing of rocks by introducing additional conditions into the model depending on its geotechnical state. Variant of the comprehensive exploitation of mineral resources was proposed considering the total value of natural and man-made geo-resources of the area being mined. The possibility of rational use of the mined-out space with the use of various positive qualities of geo-resources at their manmade transformation is also considered. An assessment of the mineral and raw materials potential of the mined area is given with a proposal for the prospects of increasing the integrated approach of excavation, increasing the life of the mining enterprise and the complexity of developing this area.

scholarly journals Stress-strain state analysis of the design of full-turning vertical empennage for aero-spacecraft

2021 ◽  
Vol 22 (1) ◽  
pp. 36-42
Author(s):  
Andrey A. Chistyakov ◽  
Valery P. Timoshenko
Keyword(s):  
Numerical Simulation ◽  
Strain State ◽  
Dynamic Pressure ◽  
Operating Conditions ◽  
Structural Scheme ◽  
Stress Strain ◽  
Mechanical Loads ◽  
Stress Strain State ◽  
Distributed Load ◽  
Calculation Results

In this work, the most rational schemes to designing the skin of a full-turning vertical empennage element (stabilator) have been studied. Skin designing schemes were chosen according to aero-spacecraft operating conditions in the re-entry trajectory. During designing process, the requirements for reusable structures of tourist-class aero-spacecrafts were taken into account, such as: maximum simplicity and endurance of the product. To determine the mechanical loads acting on the keel during its movement in the air, a numerical simulation of the aerodynamic flow-around the stabilator profile at 5 arbitrary points on the flight path was carried out. The parameters used for the analysis are: flight velocity, density and viscosity of the air. Of the 5 obtained fields of dynamic pressure acting on the stabilator, the field that creates the largest distributed load was used as the boundary condition for the analysis of the stress-strain state of the structure. The problem of mechanical loading of the stabilator was solved separately for each of the previously studied structural schemes of the skin. Based on the obtained calculation results the optimal skin structural scheme was chosen by comparing the displacements on the line connecting ribs.

Stress-Strain State of Reinforced Concrete Overpass under Load

2020 ◽  
Vol 18 (2) ◽  
pp. 68-81
Author(s):  
I. S. Bondar ◽  
M. Ya. Kvashnin ◽  
D. T. Aldekeeva
Keyword(s):  
Reinforced Concrete ◽  
Strain State ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Rolling Stock ◽  
Freezing And Thawing ◽  
Stress Strain ◽  
Stress Strain State ◽  
Operational Load ◽  
Calculation Results

Beam spans are the most vulnerable elements of the bridge system, as they are exposed to direct effects of mobile load, environmental and climatic factors (temperature and humidity effects, including freezing and thawing, shrinkage, humidity, etc.). Appearance of defects of the structure is inevitable; the refore civil engineers face a topical problem of strengthening of damaged structures of bridges. The article discusses some results of calculated values and instrumental measurements of stress-strain state (SSS) of reinforced concrete beam span structures of railway overpass under operational load caused by different rolling stock units. The objective of this study is to control stress-strain state of railway overpass for identification and elimination of defects at early stages. The calculation results obtained, carried out by finite-element method (FEM) in the program ABAQUS/Standard correlate well with experimental data. These results can be used for monitoring the state of artificial structures on main lines of JSC NC KTZ.

scholarly journals Analysis of Stress-Strain State and Contact Pressures on Surfaces of Kaplan Runner Blade Bearing Bronze Bushes

2021 ◽  
Vol 24 (3) ◽  
pp. 45-51
Author(s):  
Viktor H. Subotin ◽  
◽  
Oleksandr S. Burakov ◽  
Oleksii V. Dushyn ◽  
Viktor M. Iefymenko ◽  
...  
Keyword(s):  
Software Package ◽  
Strain State ◽  
3D Model ◽  
Automated Design ◽  
Stress Strain ◽  
Stress Strain State ◽  
Runner Blade ◽  
Calculation Results ◽  
The Given ◽  
Contact Pressures

An analysis of the existing and prospective blade seal designs for Kaplan runners was performed. The selected design type provides the maximum ecological safety for Kaplan runners. A 3D model of runner hub sector with the trunnion, inner and outer bushes of blade trunnion was generated taking into account the cyclic symmetry of the runner design based on the modern automated design engineering system. A diagram of application of external loads from the blade and lever to the given 3D model of the Kaplan runner hub segment was developed. The contact problem was formulated to determine the stress-strain state as well as the contact pressures at the inner and outer bronze bushes of the Kaplan runner blade trunnions in different operating conditions. The problem was formulated for the finite element method, taking into consideration the diagram of external load application and contact restraints to the given 3D model of the Kaplan runner hub sector in the software package for engineering calculations. Using calculation results, principal stress distribution diagrams and the distribution diagram for the contact pressure at the outer and inner bronze bushes of blade trunnions were obtained. Strength calculation results were processed using the data of principal stress distribution diagrams, and the contact pressure values at the inner and outer bronze bushes of blade trunnions were determined. A methodology for further use of the given analytical model in the evaluation of stress-strain state of Kaplan runners involving modern automated design engineering systems and software package for engineering calculations was developed. The comparison of stress-strain states of the blade trunnion bushes was performed for the old and new designs of the Kaplan runner seal.

scholarly journals CALCULATION OF THE INTENSE DEFORMED CONDITION OF SOIL FOR TAMPER WITH CHANGEABLE GEOMETRY OF THE CASE

2015 ◽  
Vol 3 (1) ◽  
pp. 27-33
Author(s):  
Владимир Моргунов ◽  
Vladimir Morgunov
Keyword(s):  
Strain State ◽  
Construction Sites ◽  
Stress Strain ◽  
Stress Strain State ◽  
Geological Conditions

The paper describes a new design for foundation compaction in vytrambovannyh pits, which allows to reduce material shell rammer on construction sites with a variety of engineering and geological conditions, as well as consider the problem of finding the parameters of the stress-strain state of subgrade compaction around this

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