Low-amplitude dynamic tests of fine gravel in a resonant column

Zaven Ter-Martirosyan,Evgeny Sobolev,George Anzhelo,A Volkov,A Pustovgar,T Sultanov,A Adamtsevich

doi:10.1051/e3sconf/20199704024

Zaven Ter-Martirosyan, Evgeny Sobolev + Show 5 more

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https://doi.org/10.1051/e3sconf/20199704024

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Abstract

Construction of industrial and civil buildings, taking into account the dynamic effects on the foundations, requires special experiments on the mechanical properties of soils. This article presents the results of studying the dynamic properties of coarse gravelly soils using the resonant column method. These studies are relevant, since the determination of the dynamic properties of coarse-grained soils under laboratory conditions is associated with a restriction on the size of the fractions in the sample volume. This circumstance leads to the fact that at the moment most of the laboratory tests of the dynamic properties of coarse-grained soils are performed on smaller aggregate fractions, which, in general, significantly reduces the resulting mechanical properties of soils. It does not reflect the real operation of the foundation of buildings during dynamic effects. This paper presents a description of the available laboratory equipment, the sequence of preparation of samples of coarse grained crushed stone soil and sample assembly in the working chamber of the installation. The article contains the main graphs characterizing the change in shear modulus and damping coefficient depending on shear deformations. It is noted that the results obtained are particularly relevant for modeling the dynamic effects of natural and man-made character on the foundations of industrial and civil buildings, the bases of which are composed of coarse-grained soils. Dynamic parameters considered in this paper, can and must be used in numerical calculations by finite element method with the use of modern groundwater models in geotechnical software systems.

Highlights

Engineering surveys and design of the foundations of industrial and civil buildings in seismic areas require special types of studies of the dynamic properties of soils
Data processing consisted in calculating for all steps of dynamic loading the relative shear deformations γ, determining its value τmax at the resonant frequency ω and calculating for this frequency the velocity of the transverse waves Vs and determining the dynamic shear modulus G and the absorption coefficient D
Based on the results of special laboratory studies performed on the dynamic properties of coarse soils, the following main conclusions can be made

Summary

Introduction

Engineering surveys and design of the foundations of industrial and civil buildings in seismic areas require special types of studies of the dynamic properties of soils. Not an easy task becomes more complicated when designing bases composed of coarse-grained soils lying within the limits of the compressible strata. Such bases can be represented by gravel (rounded) or crushed stone (angular) coarse-grained particles of rocks [1,2,3]. Considerable experience has been gained in the study of the dynamic properties of sandy and clayey soils both in laboratory and in field conditions. The main problem of studying the dynamic properties of coarse soils in the laboratory is the limitation on the size of the inclusions allowed in the soil sample. Studies of the mechanical properties of coarse-grained soils are often carried out completely and completely by «aggregate», obviously worsening the parameters obtained during the tests [8, 9]

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Conclusion