Evolution of elastic properties of granular soils under very large of number of multiaxial stress cycles

Alessandro Mandolini, Andrea Diambra, Erdin Ibraim

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

Abstract

Geotechnical structures, particularly in offshore locations, can be subjected to millions of loading cycles during their
whole design life. The stress state of soil elements close to the foundation is also three-dimensional and rotation of principal stresses
invariably occurs as the load is applied on the foundation. There is indeed an unanswered research question whether the soil
mechanical properties evolve under such long-term complex loading conditions, with important consequences for the design of
offshore geotechnical structures. The present research has investigated the effect of the application of a very large number of loading
cycles on the elastic stiffness properties of a sub-angular silica sand (Hostun sand). The experimental work has been carried using a
Hollow Cylinder Torsional Apparatus equipped with a very high-resolution local strain measurement system, composed of six noncontact
displacement transducers (0.1 μm resolution) based on eddy current effect. Several sand samples were prepared under
different initial densities and anisotropic stress level conditions, and then subjected to a large number of loading cycles. Evolution
of both Young’s and shear moduli has been mapped throughout the tests. It is shown that the material conserved its stiffness despite
the application of more than half million of small loading cycles.
Original languageEnglish
Title of host publicationISSMGE
Place of Publicationhttps://www.issmge.org/publications/online-library
Pages447-450
Publication statusPublished - 1 Sep 2017
Event19th International Conference on Soil Mechanics and Geotechnical Engineering: Unearth the Future, Connect Beyond [ ] - COEX Conference Centre, Seoul, Korea, Republic of
Duration: 17 Sep 201722 Sep 2017
Conference number: 19
https://www.icsmge2017.org

Conference

Conference19th International Conference on Soil Mechanics and Geotechnical Engineering
Abbreviated titleICSMGE
CountryKorea, Republic of
CitySeoul
Period17/09/1722/09/17
Internet address

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