Analysis of changes in the stress-strain state at a point in geoenvironment

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详细

Under natural conditions, the stress-strain state of the geological environment is formed according to the Coulomb–Mohr law (for principal stresses). The lithospheric pressure (by analogy with atmospheric one) is created at each point of geological massif under the weight of overlying deposits. Stabilization of the ground state at each point of the geoenvironment is ensured by self-organization of the stress-strain state in accordance with the Mohr–Coulomb law, which links the pressure and ground strength at a given point. The stress-strain state of soils in samples was analyzed using laboratory compression tests (with determination of acting pressure and soil strength characteristics) and compared to that in natural conditions at a point of the massif. The conditions for reaching a limit state and the manifestation of destructive soil deformations at a point are considered.

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作者简介

G. Postoev

Sergeev Institute of Environmental Geoscience, Russian Academy of Sciences

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Email: postoev.german@yandex.ru
俄罗斯联邦, Moscow

参考

  1. [GOST 12248-96. Soils and rocks. Methods of determination of deformational and strength properties of soils and rocks.] Moscow, 1996 (in Russian).
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  3. Emel’yanov, L.M. [Calculation of retaining structures]. Guidebook. Moscow, Stroyizdat, 1987, 288 p. (in Russian)
  4. Lysenko, M.P. [Composition and physico-mechanical properties of soils and rocks]. Moscow, Nedra Publ., 1980, 272 p. (in Russian)
  5. Medkov, E.I. [Phases of soil resistance]. Mekhanika gruntov, osnovaniya i fundamenty, Moscow, Transzheldorizdat Publ., 1959, issue 100, pp. 26–61. (in Russian)
  6. Рostoev, G.P. [Dissipative structures in the soil massif by the example of the formation of deep landslides]. Inzhenernaya geologiya, 2018, vol. XIII, no. 3, pp. 54–61, https://doi.org/10.25296/1993-5056-2018-13-3-54-61. (in Russian)
  7. Postoev, G.P. [Regularities in gravitational deformation of ground massifs]. Geoekologiya, 2009, no. 6, pp. 534–543. (in Russian)
  8. Postoev, G.P., Kazeev, A.I., Kutergin, V.N. [Soil strength parameters determined by compression test]. Geoekologiya, 2018, no. 3, pp. 36–42. (in Russian)
  9. Postoev, G.P., Kazeev, A.I., Kuchukov, M.M. [Geological regularities of formation of dissipative geological structures — landslide blocks]. Geoekologiya, 2021, no. 4, pp. 33–40. (in Russian)
  10. Postoev, G.P., Kazeev, A.I., Kuchukov, M.M. [Coulomb–Mohr’s law and transformation of the stress-strain state of the landslide-prone slope]. Geoekologiya, 2022, no.4, pp.16–25. (in Russian)
  11. Postoev, G.P., Kazeev, A.I., Kuchukov, M.M. [Рhysical laws of stress distribution in geoenvironment]. Geoekologiya, 2020, no. 6, pp. 22–31. (in Russian)
  12. Postoev, G.P., Kuchukov, M.M., Kazeev, A.I., Orlova, N.A. [The geological criterion 0.009 in the development of geodynamic processes]. Sergeev’s readings, 2023, issue 24, pp. 23–28. (in Russian)
  13. Tsytovich, N.A. [Soil and rock mechanics. Ed. 4]., Moscow, Gosstroyizdat, 1963, 636 p. (in Russian)

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2. Fig. 1. Schematic diagram of axial compression of soil under conditions of impossibility of lateral expansion with measurement of reactive lateral pressure: 1 — rigid wall of the device chamber; 2 — soil sample; 3 — upper stamp; 4 — device for measuring reactive lateral pressure; 5 — lower stamp.

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3. Fig. 2. Graph of the relationship between lateral σ3 and axial σ1 pressures during compression of cohesive soil.

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4. Fig. 3. Graphical representation on the shear diagram of the soil strength characteristics at a point and the ultimate pressures for the stabilized state according to the Coulomb–Mohr law.

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5. Fig. 4. Schematic engineering-geological section along the central section of the formation zone of a new landslide block in 2007 at the Khoroshevo landslide site (Moscow) [9]. 1 and 2 — clays of the Volgian and Oxfordian stages of the Jurassic system, respectively; 3 — sands of Quaternary deposits; 4 — slip surface; 5 — landslide body; 6 — borehole. Circles with centers O1 and O2 are the boundaries of the DGS (shown by green lines).

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