Geological background of the estimation of natural stresses in soil body

Vestnik MGSU 1/2015
  • Chernyshev Sergey Nikolaevich - Moscow State University of Civil Engineering (National Research University) (MGSU) Doctor of Geologo-Mineralogical Sciences, Professor, Department of Engineering Geology and Geoecology, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 44-53

Initial and boundary conditions are always given for solving the problem of calculating the interaction of tunnels and other underground structures with soil and rocks. The same conditions are set for calculating the surface buildings. These initial data for calculation are divided into three groups: 1) the geometrical shape of the layers of rocks (geological structure); 2) the parameters of the strength and compressibility of rocks; 3) compressive stresses in the array. These data all over the world are set with engineering surveys. In engineering surveys there are good methods of determining the source of the data 1 and 2. But there is no available methodology for determining the natural stress state. Therefore, compressive and tensile stresses are usually determined by mathematical modeling. The calculation of the compressive stresses is done on the basis of the following hypotheses: compressive stresses are created by the weight of rocks; they go down in proportion to the density of rocks; the main normal stress is has a vertical direction; normal stress in horizontal direction is smaller. The value of the horizontal stress is was calculated using Poisson’s ratio. This hypothesis of the nineteenth century was used another 50 years ago, when it was not known exactly about the movement of the continents and when compressive stresses in the earth’s crust have not yet been measured. Today a universal application of this hypothesis is not correct. Now the application of this hypothesis in many cases is not correct. In this research paper an attempt is made to specify the area, in which the above hypothesis can be used. This is done on the basis of current scientific evidence. Abroad this way of calculating tunnels and other underground structures and bases of buildings should be done taking into account the real field of natural stresses. The geological characteristics of the location of the axes of stresses in soil body are based on the study of fractures. Also the article shows the influence of the surface topography of the territory on stress in soil. In order to draw conclusions the author uses his observations of the construction in Siberia and Mongolia, as well as publications of other scientists. The author notes that in engineering surveys for construction of tunnels, high-rise dams, high rise buildings there is no good method of determining the natural stresses in rocks and soils, which is equal in accuracy to the methods of construction of geological sections and methods for determining the estimated characteristics of the soil. This gap needs to be filled. The possible direction of work is: to combine the methods of direct measurements of compressive stresses with indirect geophysical methods and computer modeling.

DOI: 10.22227/1997-0935.2015.1.44-53

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