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Numerical Analysis of Confining Effect Due to Geosynthetics Wrapping Compacted Soil Specimen  

Kim, Eun-Ra (Dept., of Civil Eng., Chonbuk National Univ.)
Kang, Ho-Keun (School of Mechanical and Aerospace, Gyeongsang National Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.20, no.2, 2004 , pp. 37-46 More about this Journal
Abstract
This paper presents the modeling of geosynthetic-reinforced soils and discusses the reinforcement effect arising from confining the dilatancy deformation of the soil by geosynthetics. A series of compressive shear tests for compacted sandy soil specimens wrapped by geosynthetics are carried out by quantitatively examining the geosynthetic-reinforcement effect, and it occurred from the confinement of the dilative deformation of compacted soils during shearing. In the test, the initial degree of compaction is changed for each series of sandy soil specimens so that each series has different degree of dilatancy characteristics. Herein, the axial forces working to the geosynthetics so as to prevent dilative deformation of compacted soils during shearing are measured. Furthermore, the elasto-plastic modeling of compacted soils and a rational determination procedure of input parameters needed in the elasto-plastic modeling are presented. In this paper, the subloading yielding surface(Hashiguchi(1989)) is introduced to the elasto-plastic modeling which could describe the irreversible deformation characteristics of compacted soils during shearing. Finally, the elasto-plastic finite element simulation is carried out and the geosynthetic-reinforcement effect is discussed.
Keywords
Compacted soils; Elasto-plastic modeling; Geosynthetic-reinforcement;
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