EVALUATION OF SEISMIC PROPERTIES OF WATER-SATURATED
SOILS FOR SOLVING PROBLEMS IN SEISMIC MICROZONING
© 2019 B. A. Trifonov^1,*, V. V. Sevostyanov¹, S. Yu. Milanovskiy², V. V. Nesynov^1
1Sergeev Institute of Environmental Geoscience, Russian Academy of Sciences,
Ulanskii per., 13, str. 2, Moscow, 101000 Russia
^*E-mail: igelab@mail.ru
²Schmidt Institute of Physics of the Earth, Russian Academy of Sciences,
Bolshaya Gruzinskaya ul., 10-1, Moscow, 123242 Russia

The experts involved in seismic microzoning (SMZ) have different opinions on whether to take into ac­count the response of water-saturated fine soils upon the assessment of expected seismic effect. When using the method of seismic stiffness (MSS), a number of researchers consider inexpedient to apply the correction for the groundwater level (GWL). In the present paper, we analyze both the results of our own field studies and those of other researchers involved in the development of SMZ methodology. Particular attention is paid to the GWL influence on the increment of seismic intensity (ДI ) in the S.V. Medvedev's equation upon MSS calculations by transverse s-waves. The research results provided in this paper prove that the correction for AIgwl should not be ignored in calculations of the seismic intensity increment. The authors appear it expedient to continue field tests in the registration of strong movements in water-saturated fine soils.

Keywords: seismic intensity, fine soils, water content of soils, amplification of seismic intensities, seismic microzoning, method of seismic stiffness.

DOI: https://doi.org/10.31857/S0869-78092019574-81

REFERENCES

1. Aleshin, A.S. Seismicheskoe mikroraionirovanie osobo otvetstvennykh ob'ektov [Seismic microzoning of highly responsible objects] Moscow, Svetoch Plyus, 2010, 304 p. (in Russian)

2. Aleshin, A.S. Kontinual'naya teoriya seismicheskogo mikroraionirovaniya [Continual theory of seismic microzoning]. Moscow, Nauchnyi mir, 2017, 301 p.

3. Aptikaev, F.F. Instrumental'naya shkala seismicheskoi intensivnosti GOST R 57546-2017 [Instrumental scale of seismic intensity GOST R 57546-2017]. Moscow, Nauka i obrazovanie, 2012.

4. Barkan, D.D., Trofimenkov Yu.G., Golubtsova M.N. Influence of foundation soils properties in engineer¬ing structures calculation for seismic impact. Svoistva gruntov pri vibratsiyakh [Soil properties on vibrations]. Tashkent, FAN, 1975, pp. 55-69

5. Kriger, N.I., Aleshin, A.S., Kozhevnikov, A.D., et al. Seismicheskie kharakteristiki lessovykh porod v svyazi s geologicheskim okruzheniem i tekhnogenezom [Seismic characteristics of loess soils in relation to geological surroundings and technogenesis]. Moscow, Nauka, 1980, 96 p.

6. Maksimov, A.B. O reaktsii gruntov na intensivnye kolebaniya [Soil response to intense vibration]. Voprosy inzhenernoi seismologii ,1973, no. 10, pp. 50-62.

7. Medvedev, S.V. Inzhenernaya seismologiya [Engineering seismology]. Moscow, Gosstroiizdat, 1962, 284 p.

8. Medvedev, S.V. Otsenka seimsicheskloi ball'nosti v zavisimosti ot gruntovykh uslovii [Assessment of seismic intensity depending on ground conditions]. Proc. Geophysical Institute, 1952, no. 14, pp. 29-52.

9. Mindel', I.G., Trifonov, B.A., Sevost;yanov, V.V., Ragozin, N.A. Osobennosti reaktsii slabykh vodonasys- hchennykh gruntov na dinamicheskie vozdeistviya pri zemletryakh [Specific response of weak water-saturated soils to dynamic impact upon earthquakes]. Geoekologiya, 2014, no. 5, pp. 387-401

10.          Pavlenko, O.V. Seismicheskie volny v gruntovykh sloyakh: nelineinoe povedenie grunta pri sil'nykh zemletryaseniyakh poslednikh let [Seismic waves in soil layers: nonlinear behavior of soil upon recent strong earthquakes]. Moscow, Nauchnyi mir, 2009, 257 p.

11. Khachian E. Applied Seismology. Yerevan, “Gitutyun” publicher NAS RA, 2008, 491 p.

12. Reid, H.F. The mechanics of the earthquakes. The Californian earthquake of April 18, 1906. Rep. of the State Investigation Commission. The Carnegie Inst. Washington, vol. 2, Pt. 1, 1910. 56 p.

13. Sieberg, A. Die Erdbeben. Handbuch der Geophysik, 1930, vol. 4, Berlin, pp. 527-686.