EVALUATION OF SOIL STABILITY BY NUMERICAL MODELING

Abstract

The relevance of the research.The construction of industrial facilities in areas with difficult relief and geological structure requires calculations of the stress-strain state in order to obtain estimates of the zones of irreversible deformation development. This problem can be solved using numerical modeling. In this paper, we consider a section of the planned construction of the Volochaevskoe electric depot of the Dzerzhinsky line of the Novosibirsk subway. The difficult relief and low strength characteristics of the construction zone require special attention to assess the soil bearing capacity and the slopes stability of closely located ravines. Numerical modeling is used to assess the stress-strain state of the medium using geophysical data on the structure and mechanical properties. These data provided information on stress concentration zones and the possible development of irreversible deformation. The main aim of the researchis to determine the stress-strain state and evaluate the stability of the upper part of the geological section using petrophysical and geophysical data obtained by seismic and electrical exploration. The object: geological section along the extension section of the Dzerzhinsky line of the Novosibirsk subway of the Volochaevskoe electric depot. Methods. Numerical modeling is used to calculate the stress-strain state in the construction zone. The problem is solved in an elastoplastic setting. Geometric and geomechanical parameters of the environment are obtained in the analysis of petrophysical and geophysical data. Result.The paper considers the section of the medium crossing the construction site of the electric depot «Volochaevskoye» of the Dzerzhinsky line of the Novosibirsk subway. Two geomechanical models are introduced:the first horizontally layered built on the basis of seismic data,the second is more complex, it includes data on heterogeneities found on the basis of the electrical resistivity distribution. The study area is characterized by a general deformation associated with zones of reduced strength. They are found in a complex analysis of electrical exploration and petrophysics. The stress-strain state does not significantly change taking into account these zones. Localization zones of irreversible deformation and fracturing can be formedin the upper part of the earth's crust. It was established that zones with a sharp difference in relief represent the greatest danger and will be destroyed first.

Keywords

• geomechanics
• numerical modeling
• stress-strain state
• deformation
• fracture
• geophysical research
• novosibirsk