Features of Numerical Modeling In Situ Stress State Massive of Rocky and Issues of Verification of the Data

Abstract:

Modern buildings erected on bedrock or is to be equipped directly in an array (in particular hydroelectric power stations, underground storage facilities and soon), are technically complex, often unique objects construction. At the same time, the cost of design and construction of such facilities is very high. In this context, particular relevance is the question of stable and safe operation of facilities. Now, generally recognized that the study of the functioning of large technical systems (such as the base - structure) with a randomly varying characteristics most adequately carried out was done by different types of complex modeling, particularly mathematical, simulation, and in some cases - physical modeling [3]. However, before moving to a system of «building/foundation» is necessary to examine the massif in situ. Modern software systems (such as Plaxis, ZSoil, Comsol, Abaqus, and soon) have are significant opportunities that allow to make calculations with high accuracy. In particular, implemented a specialized model of soils, such as models of Hoek-Brown, Jointed Rock and others [5]. They allow you to get a more objective picture of the state stress of the array according to the degree of fracturing and anisotropy properties. They allow you to get a more objective picture of the state stress of the array according to the degree of fracturing and anisotropy properties. In addition, is possible a reflection of the detailed features of the geological structure in the 3D calculation that gives an idea of the influence of the field to an array of building/foundation. But, it is necessary to understand that the simulation is based on idealization and averaging the physical and mechanical properties of the medium under study. The inevitable errors and inaccuracies in the calculations. As a real rock massif is a complex system, in the work showed of drawing up an analysis of structural models and their implementation using conventional concepts and a more detailed study. The isolation of the structural elements and boundaries in an array of rocky soils should be approached with special attention. This is due, primarily, with the features of the geological structure of the study area: for example, improperly allocate lithological boundaries as in the case of consideration arrays dispersed soils, because rocky soils is a monolithic solid. Select elements should be performed in accordance with the characteristic feature, such as a fracture, blocking and so on. Besides the issue of numerical modeling of rock masses, in the issues of verification data obtained by numerical method. With the increasing complexity of the technical constructions, increasingly there is a need to verify the results of numerical simulations with actual operating voltage value in the array. Since the field of stress research methods is very expensive and labor-intensive, trade-off seems logical to use in the verification of the results of numerical modeling of acoustic emission (AE) [6]. This method may be used in combination of laboratory tests. With this approach, it is possible to achieve significant improvements in the quality of the received information.

• Periodical: Applied Mechanics and Materials (Volume 843)
• Pages: 36-44
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.843.36
• Online since: July 2016
• Authors: Ivan E. Sas, Elena B. Cherepetskaya
• Keywords: In Situ Stress, Massive of Rock, Numerical Modeling, Stress State, Verification Stress State of AE Method

References

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DOI: 10.1134/1.2133948

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