Mehrab Jesmani (Author), Hamed Faghihi Kashani (Author), Mehrad Kamalzare (Author)

Abstract

The shear modulus, known as Gmax, is a key parameter for predicting the static and dynamic behavior of soils. Its value decreases by increasing the shear strain. This is because of reducing the soil’s stiffness as a result of increasing the shear deformation. The increasing of the shear modulus by increasing the shear strain is affected by some of the soil properties, such as the Void ratio (e), the Over consolidated ratio (OCR), the Normal stress (σ), the Plasticity index (PI), the Water content (ω%), the Shear strain rate, the Soil structure, and the Loading history, etc. In this paper, undrained, direct shear tests were conducted to study the effect of the plasticity index (PI) and the normal stress (σ) on the shear behavior and the shear modulus of remolded clays. The results show that the normalized shear modulus at a constant strain will generally increase as the σ and PI increase, and the common empirical equations for undisturbed soils at γ = 0~0.1 might be applicable for the disturbed soils too.

Keywords

plasticity index;normal stress;shear modulus;disturbed clayey soils;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UM FGPA - Faculty of Civil Engineering, Transportation Engineering and Architecture
UDC: 551:624.13
COBISS: 257453312 Link will open in a new window
ISSN: 1854-0171
Parent publication: Acta geotechnica Slovenica
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Other data

Secondary language: Slovenian
Secondary title: Vpliv plastičnosti in normalne napetosti na nedrenirane strižne module glinenih zemljin
Secondary abstract: Strižni modul, znan kot Gmax, je ključni parameter za napovedovanje statičnega in dinamičnega obnašanja zemljin. Njegova vrednost se zmanjšuje s povečanjem strižne deformacije. To je zaradi zmanjšanja trdnosti zemljin kot posledice povečanja strižne deformacije. Na povečanje strižnega modula s povečanjem strižne deformacije vplivajo nekatere lastnosti tal, kot so količnik por (e), prekonsolidacijsko razmerje (OCR), normalna napetost (σ), indeks plastičnost (PI), vsebnost vode (w%), strižno deformacijsko razmerje, struktura tal, zgodovina obremenjevanja, itd. V članku so prikazani rezultati direktnih nedreniranih strižnih preiskav porušenih glin, ki so bile izvedene z namenom proučevanja vpliva indeksa plastičnosti (PI) in normalne napetosti (σ) na njihove strižne lastnosti in strižni modul. Rezultati kažejo, da normalizirani strižni moduli pri konstantni napetosti v splošnem naraščajo z naraščanjem indeksa plastičnosti in normalne napetosti in da je lahko splošna empirična enačba za intaktne zemljine pri γ = 0~0.1 uporabna tudi za porušene zemljine.
Secondary keywords: geološki materiali;glineni materiali;zemljine;plastičnost;strižne lastnosti;strižni modul;normalna napetost;
URN: URN:SI:UM:
Type (COBISS): Scientific work
Pages: str. 47-59
Volume: ǂVol. ǂ7
Issue: ǂno. ǂ1
Chronology: 2010
ID: 10940516