scholarly journals Prediction of the Geomechanical State of the Fixed Ground Basis of a Mining Building

2019 ◽  
Vol 105 ◽  
pp. 01036
Author(s):  
Mikhail Sokolov ◽  
Mikhail Karablin
Keyword(s):  
Strain State ◽  
Stress Strain ◽  
Stress Strain State ◽  
Geological Surveys ◽  
Geomechanical State ◽  
Injection Technology

The results of engineering and geological surveys to the ground base of a mining and technical building, composed of man-made filled-up ground, are presented. A simulation of the stress-strain state of a fixed ground base was carried out. The analysis of changes in the geomechanical state of the ground massif as a result of injection compaction is presented, on the basis of which recommendations are given on adjusting the parameters of the injection technology.

scholarly journals SIMULATION OF DISPLACEMENT OF LANDSLIDES ON THE MATERIALS OF GEODESIC OBSERVATIONS AND ENGINEERING-GEOLOGICAL SURVEYS

2021 ◽  
Vol 26 (2) ◽  
pp. 5-17
Author(s):  
Alexandra A. Islyamova ◽  
◽  
Valery S. Khoroshilov ◽  
Keyword(s):  
Strain State ◽  
Open Pit ◽  
Published Data ◽  
Successful Implementation ◽  
Stress Strain ◽  
Engineering Structures ◽  
Stress Strain State ◽  
Geological Surveys ◽  
Landslide Body ◽  
Simple Slope

The article discusses the possibilities of applying modeling of the stress-strain state of slopes to predict landslide hazard, which is very important for the successful implementation of all subsequent stages of design, construction and operation of engineering structures. The article considers the exist-ing approaches and methods used in the process of solving the problem, and determines the study as the type of mathematical modeling of the stress-strain state of a landslide body by the finite element method. It is shown that the selection of specific mathematical expressions for all subsequent calcula-tions is carried out depending on the specific type of landslide. The mechanisms of deformation and destruction of the slope under the action of gravitational forces are shown using the data of geodetic observations and engineering-geological surveys. As a result of the studies performed, calculations were made on several models illustrating the behavior of the soil massif of a landslide-prone slope. Stress patterns were obtained for a simple slope with a steepness of 35°, which coincide with the pre-viously published data of the physical experiment for the real open pit slope.

scholarly journals Predicting the Stress-Strain State of the Fractured Rock Massif on the Example of Interchamber Pillars

2019 ◽  
Vol 9 (2) ◽  
pp. 4228-4233
Keyword(s):  
Strain State ◽  
Numerical Models ◽  
Fractured Rock ◽  
Strength Properties ◽  
Rock Massif ◽  
Qualitative Description ◽  
Stress Strain ◽  
Stress Strain State ◽  
Geological Surveys ◽  
Spatial Geometry

The article describes the finding of the qualitative differences in the formation of the stress-strain state of a disturbed rock massif on the example of interchamber pillars with various methods of accounting for the structural disturbance and different spatial geometry of the cracks. Three numerical models are created with different methods of accounting for the disturbances in the massif continuity: in the first model, the strength of the massif is described by the Hoek and Brown criterion; the second and the third models are rock massifs for which violations in the continuity are formed explicitly, using ready-made templates of the systems of cracks presented in the Phase2 software product. The results obtained for the different models illustrate the inaccuracies occurring in assessing the disturbance of rock massif using score criteria. Models with underrated strength properties of the rock inaccurately describe the real mechanisms of the fractured massif: the qualitative description is not consistent with the results of field observations and geological surveys of rocks in general.

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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