Disturbed state model for sand-geosynthetic interfaces and application to pull-out tests
✍ Scribed by Pal, Surajit; Wathugala, G. Wije
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 202 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0363-9061
No coin nor oath required. For personal study only.
✦ Synopsis
Successful numerical simulation of geosynthetic-reinforced earth structures depends on selecting proper constitutive models for soils, geosynthetics and soil}geosynthetic interfaces. Many constitutive models are available for modelling soils and geosynthetics. However, constitutive models for soil}geosynthetic interfaces which can capture most of the important characteristics of interface response are not readily available. In this paper, an elasto-plastic constitutive model based on the disturbed state concept (DSC) for geosyn-thetic}soil interfaces has been presented. The proposed model is capable of capturing most of the important characteristics of interface response, such as dilation, hardening and softening. The behaviour of interfaces under the direct shear test has been predicted by the model. The present model has been implemented in the "nite element procedure in association with the thin-layer element. Five pull-out tests with two di!erent geogrids have been simulated numerically using FEM. For the calibration of the constitutive models used in FEM, the standard laboratory tests used are: (1) triaxial tests for the sand, (2) direct shear tests for the interfaces and (3) axial tension tests for the geogrids. The results of the "nite element simulations of pull-out tests agree well with the test data. The proposed model can be used for the stress-deformation study of geosynthetic-reinforced embankments through numerical simulation.