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http://dx.doi.org/10.7843/kgs.2013.29.2.15

Analysis of Permanent Deformation under Repetitive Load Based on Degraded Secant Modulus  

Ahn, Jaehun (School of Civil and Environmental Engrg., Pusan National Univ.)
Oh, Jeongho (Dept. of Railroad Facility Engrg., Korea National Univ. of Transportation)
Shin, Hosung (Dept. of Civil and Environmental Engrg., Univ. of Ulsan)
Publication Information
Journal of the Korean Geotechnical Society / v.29, no.2, 2013 , pp. 15-21 More about this Journal
Abstract
The analysis of long-term performance of pavement sections under wheel loads is normally conducted in two separated steps. First the resilient behavior of the pavement is calculated assuming the pavement is a layered or discrete elastic medium, and then the permanent deformation is evaluated based on empirical permanent displacement equations. Material properties required in both steps can be obtained from cyclic triaxial tests, in other words, resilient and permanent deformation tests. While this analytical approach is simple and convenient, it does not consider the modulus degradation caused by cyclic loads, and some types of reinforcements such as geosynthetic cannot be modeled in this type of analysis. A model for degraded secant modulus is proposed and suggested to be used for the analysis of permanent behavior of unpaved roadway sections. The parameter for suggested model can be obtained from cyclic triaxial tests, regular practice in pavement engineering. Examples to estimate the model parameters are presented based on both laboratory permanent deformation test and large-scale plate load test.
Keywords
Secant modulus; Permanent deformation; Subgrade; Pavement; Numerical analysis;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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