ISSN: 1945-7545
CODEN: GTJODJ
Published Online: 24 January 2013
Page Count: 9

Fatigue Cyclic Tests on Artificially Cemented Soil

Viana da Fonseca, A.
Dept. of Civil Engineering, Faculty of Engineering of the Univ. of Porto (FEUP), Porto,

Rios, S.
Dept. of Civil Engineering, Faculty of Engineering of the Univ. of Porto (FEUP), Porto,

Amaral, M. F.
Dept. of Civil Engineering, Faculty of Engineering of the Univ. of Porto (FEUP), Porto,

Panico, F.
Dept. of Civil Engineering, Faculty of Engineering of the Univ. of Porto (FEUP), Porto,

(Received 13 June 2012; accepted 28 November 2012)

Abstract

Artificially cemented soils are frequently used in the infrastructural layers of road or railway platforms but the durability of these structures is often questioned when subjected to cyclic loads. In order to evaluate the fatigue behavior, this paper presents long cyclic triaxial tests over several soil cement mixtures using a very well graded silty sand and Portland cement. In undrained cemented tests, pore pressure decreased as a sign of plastic degradation, resulting that the effective stresses rose during the tests. For that reason, the resilient moduli were normalized to the effective stress, revealing a clear drop on the normalized resilient modulus at a number of cycles depending on the porosity/cement ratio. Notwithstanding, drained and undrained tests presented in this paper performed in uncemented and cemented specimens showed a distinct behavior from granular materials (where the shakedown theory applies) revealing a continuous increase in the accumulated permanent deformations, indicating that long term cyclic triaxial tests, with large number of cycles, may be decisive for a reliable characterization of cyclic triaxial test for bound mixtures.

Keywords:
cemented soils, pore pressure, porosity/cement ratio

Paper ID: GTJ20120113
DOI: 10.1520/GTJ20120113
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