scholarly journals Influence of the location of unloading piles in backfill on the stress-strain state of the bolverk

2021 ◽  
pp. 165-175
Author(s):  
Daria A. Podkorytova
Keyword(s):  
Internal Friction ◽  
Strain State ◽  
Earth Pressure ◽  
Active Earth Pressure ◽  
Stress Strain ◽  
Angle Of Internal Friction ◽  
Stress Strain State ◽  
Ground Pressure ◽  
Unloading Effect

 This article is devoted to the reconstruction and strengthening of structures of the bolverk type. The paper describes the calculation of the active ground pressure on the berth wall of the bolverk type when the latter is reinforced by unloading piles in the backfill of the wall. The aim of the work is to assess the change in the degree of impact of active ground pressure when changing the distance from the unloading piles to the mooring wall. This author calculated, which are identified and shown with the help of nomograms and graphs based on active earth pressure from the main characteristics of the soil, spacing of discharge piles, the angle of internal friction, the distance from the unloading of the piles to the wall; the options considered overlapping discharge zones without overlap; the resulting coefficients reduce the load under various conditions of construction. The proposed calculation allows us to estimate the unloading effect of the use of piles in the backfill of existing berth walls of the bolverk type.

scholarly journals Calculation of the slope of the filling reinforced geosynthetic structure on frozen soils

2020 ◽  
Vol 7 (3) ◽  
Author(s):  
Alexey Kazharskii ◽  
Sergey Kudryavtsev ◽  
Anastasiia Borisova
Keyword(s):  
Strain State ◽  
Retaining Wall ◽  
Stress Strain ◽  
Angle Of Internal Friction ◽  
Retaining Structure ◽  
Stress Strain State ◽  
Shear Characteristics ◽  
Restoration Work ◽  
The Stability

The article studies the problem of assessing the possible causes of deformations of the retaining gabion wall, performing calculations of the stability of the retaining wall for the period of restoration work, as well as developing a project to stabilize the deformed section. The aim of the work is to assess the possible causes of deformations of the retaining gabion wall for a certain period of time, to perform calculations of the stability of the retaining wall for the period of restoration work, as well as to develop a project to restore the deformed section. At the first stage of the work, the stability and reliability of the measures for temporary embankment protection were checked for the period of dismantling the gabion retaining wall and building a new retaining structure. At the second stage of work, a design of a retaining structure was developed at the site of the dismantling carried out. As an alternative design of the gabion retaining wall, an armored structure made of geogrid was considered. The analysis of possible causes of deformations is carried out. The calculation of the stability of the retaining wall before/after the measures to strengthen the slope was performed. Calculations of an armored soil wall from a geogrid were carried out in the Midas GTS NX software package, which allows you to perform stability calculations, determine the stress-strain state of the base and structure, determine deformations, forces, etc. The solution to the problem of determining the stability of the structure was made by the method of strength reduction. The search for a solution is carried out on the basis of a sequential decrease (increase) in the shear characteristics of the soil (specific adhesion and the angle of internal friction). The calculation of stability and determination of the stress-strain state are performed. The results of the conducted studies have shown the effectiveness of using geogrids with soil wrapping as an measure to strengthen the slope. The condition for ensuring the stability of the retaining wall is provided if the recommendations for the construction of the retaining structure are followed.

КОНСТРУКТИВНО-ТЕХНОЛОГІЧНІ ОСОБЛИВОСТІ ХВОСТО-ВИХ БАЛОК СІТЧАСТОГО ТИПУ З ПОЛІМЕРНИХ КОМПО-ЗИЦІЙНИХ МАТЕРІАЛІВ ВЕРТОЛЬОТІВ ТРАНСПОРТНОЇ КАТЕГОРІЇ

2020 ◽  
pp. 15-30
Author(s):  
А. Г. Гребеников ◽  
И. В. Малков ◽  
В. А. Урбанович ◽  
Н. И. Москаленко ◽  
Д. С. Колодийчик
Keyword(s):  
Finite Element ◽  
Strain State ◽  
Layer Structure ◽  
Metal Structure ◽  
Element Model ◽  
Stress Strain ◽  
Element Analysis ◽  
Mesh Structure ◽  
Stress Strain State ◽  
Mesh Structures

The analysis of the design and technological features of the tail boom (ТB) of a helicopter made of polymer composite materials (PCM) is carried out.Three structural and technological concepts are distinguished - semi-monocoque (reinforced metal structure), monocoque (three-layer structure) and mesh-type structure. The high weight and economic efficiency of mesh structures is shown, which allows them to be used in aerospace engineering. The physicomechanical characteristics of the network structures are estimated and their uniqueness is shown. The use of mesh structures can reduce the weight of the product by a factor of two or more.The stress-strain state (SSS) of the proposed tail boom design is determined. The analysis of methods for calculating the characteristics of the total SSS of conical mesh shells is carried out. The design of the tail boom is presented, the design diagram of the tail boom of the transport category rotorcraft is developed. A finite element model was created using the Siemens NX 7.5 system. The calculation of the stress-strain state (SSS) of the HC of the helicopter was carried out on the basis of the developed structural scheme using the Advanced Simulation module of the Siemens NX 7.5 system. The main zones of probable fatigue failure of tail booms are determined. Finite Element Analysis (FEA) provides a theoretical basis for design decisions.Shown is the effect of the type of technological process selected for the production of the tail boom on the strength of the HB structure. The stability of the characteristics of the PCM tail boom largely depends on the extent to which its design is suitable for the use of mechanized and automated production processes.A method for the manufacture of a helicopter tail boom from PCM by the automated winding method is proposed. A variant of computer modeling of the tail boom of a mesh structure made of PCM is shown.The automated winding technology can be recommended for implementation in the design of the composite tail boom of the Mi-2 and Mi-8 helicopters.

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