Numerical Modeling of the Degradation of the Normal Stress Under Large Number of Shearcycles

Author:

Bellayoune Assia1,Messast Salah2,Boulon Marc3

Affiliation:

1. Ph.D.Student , Skikda , Algeria

2. Professor of Civil Engineering, Civil Engineering Department , LMGHU Laboratory , University 20 August 1955 of Skikda , Algeria

3. Professor of civil engineering, Laboratory 3S-R , University Grenoble Alpes , France

Abstract

Abstract The evaluation of friction is an important element in the verification of stability and the determination of the bearing capacity of piles. In the case of cyclic stress, the soil-pile interface has a relaxation which corresponds to a fall in the horizontal stress which represents the normal stress at the lateral surface of the pile. This paper presents an explicit formulation to express the degradation of the normal stress after a large number of shear cycles as a function of cyclic parameters. In this study we are interested in the exploitation of the cyclic shear tests carried out by Pra-ai [1] with imposed normal rigidity (CNS) in order to demonstrate the phenomenon of falling of the normal stress. The approach presented in this paper consists in proposing a simple expression for estimating the degradation of normal stress as a function of cyclic shear parameters after a large number of cycles. The validation of this approach is verified by the application of this formulation to a real case where the comparison of the simulations made by this approach with those recorded on site shows the good adaptation of this approach to this type of problems.

Publisher

Walter de Gruyter GmbH

Subject

General Medicine

Reference28 articles.

1. 1. Pra-ai, S 2013. Trials and modeling of cyclic soil-structure cyclic shear with a large number of cycles. Application to piles. Doctorat Thesis. University of Gernoble-APES.

2. 2. Lim, JK and Lehane, B 2014. Shearing Resistance During Pile Installation In Sand. Journal of Geotechnical Engineering 168(3), 1-9.

3. 3. Messast, S, Boulon M, and Flavigny, E 2008. Constitutive Modeling Of The Cyclic Behaviorof Sands In Drained Condition. Studia Geotechnica And Mechanica 1(2), 131-137.

4. 4. El Arja, H, Abchir, Zand Burlon, S 2018. Contributions To The Dimensioning Of The Piles Under Cyclic Axial Loadins. National Days of Geotechnical and Geology Engineering.

5. 5. Dob, H, Messast, S, Boulon, M and Flavigny, E 2016. Treatement of the high numbre of cycles as a pseudo-cyclic creep by analogy with the soft soil creep model. Geotech Geol Eng 34, 1985-1993.

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