Purpose. To create a model allowing integration of the diverse features identified for the rock massif behavior by differentiation of various theories and real phenomena into a single information-analytical flow.Methods. System analysis of computational experiments' results was based on the use of recursive calculation methodology for assessing accuracy of the obtained results with different methods of geometric and physical description applied to individual elements of simulation in the computational domain.Findings. Sample tables were obtained containing the acceptable values of weight characteristics for the various simulated elements in the generalized computational domain. A recursive algorithm for the analysis of the studied objects description' efficiency in the solution of geomechanics problems by grid numerical methods was formulated and implemented as a computational module. The authors created a system for the assessment of the results obtained via computational experiment at the time of full-scale investigation, which provides a comprehensive analysis of changes in the rock massif state during the operation of the selected support system. The conditions of combining the design characteristics of the simulated support elements functioning in a single load-carrying system under dynamic redistribution of forces were obtained.Originality. The resulting generalized model of mine working and elements affecting its condition allows to determine most accurately the nature of changes in the stress-strain state of geotechnological system regardless of the originally a priori specified limitations. Practical implications.The unified approach can be used in the search for the optimal parameters of implementing combined working supports in the area of mining operations and beyond.
Purpose. Substantiating the method for forecasting rock pressure manifestation in the system "layered massifworking support" on the basis of displacement patterns detection at any arbitrary point of the preparatory working circuit during the computational experiments. Methods.Computational experiments were carried out on the basis of the finite element method using the solid computational domain, provided superlimiting non-linear behavior of the simulated materials. The use of numerical grid methods allows creating geometrically and physically complex simulation models and manipulate their state within a wide range.Findings. The calculations defined that with weak links between adjacent strata, acting shear stresses destroy them in the vicinity of working, and the contiguous rock strata deform with mutual sliding. Analysis of reduced stress area allows to substantiate with accuracy sufficient for mining computations a unified average structure of the computational domain that most comprehensively reflects all the main features of a real mining massif which are likely to influence computational error. This choice ensures the introduced error value within 10% in the entire range of mechanical parameters change of the rock massif strata.Originality. Stress-strain state of frame support and patterns of its change with increasing mining depth are nonlinear, especially with nearby rock strata entering the superlimiting state; formation of the plastic hinges system along the frame support circuit, which causes the development of such replacements that exclude the possibility of further working exploitation.Practical implications. The proposed method allows to determine the optimal indicators of maintaining a working driven in the finely-layered rock massif, which makes it possible to significantly reduce operation costs.
The purpose of the article is to theoretically substantiate and improved travel insurance systems in Ukraine in accordance with international insurance standards. Methodology.The research methodology consists in the use of general scientific and special research methods: the method of theoretical generalization and comparison, hermeneutic – to study the legal aspects of insurance services in the field of in- ternational tourism, comparative – to identify differences between: foreign and domestic insurance practices in international tourism. The scientific novelty of theobtained results lies in the substantiated expediency of introducing internationalexperience in the organization of the tourism insurance system in Ukraine. The mechanism of introduction of the international experience of the organization of system of insurance of tourism in Ukraine is offered. Conclusions. The study of the essence and concept of insurance in the field of tourism, allowed to determine the specifics of insurance activities in Ukraine. The article presents an analysis of the problems of travel insurance in Ukraine, improved the system of tourism in- suranceinUkraine,inaccordancewithinternationalinsurancestandards.
The purpose of this study is to determine the nature of influence of the rheological properties of the rocks on the results of computational experiments simulating the mine workings contour condition during the breakage face advance. To determine the deformations along the mine workings contour, the calculations have been made of the junction area between the preparatory and stope face mine workings by the finite element method for various parameters of the material models. These data provided the basis for analysis of the patterns development of the rheology modelling influence on the stress-strain state of the geomechanical system. The obtained patterns are described by a function of many variables, and this function determines the limit and degree of rheology effect on the results of calculations. For the first time this pattern takes into account the heterogeneity of the rheological characteristics of rocks and the specifics of the computational domain geometry. The use of the obtained patterns makes it possible to simplify significantly the process of modelling in time and space of the geomechanical systems, which have a complex structure describing the interaction of several objects.
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