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Abstract

In this study, soil/geotextile interaction is characterized by the following general equation-τ = τ_a + tan δ*( σ_nor) ⁿ -where τ and σ_nor are shear and normal stresses on the failure plane at failure, τ_a is the soil/fabric adhesion component, and δ* and n are friction indexes. This equation provides a general relationship in which the classical Mohr-Coulomb law is considered as a special case. It holds for a wide range of normal stresses and describes soil/geotextile interaction in terms of material-related parameters. A theoretical interpretation of the effects of critical factors affecting soil / geotextile interaction is based on this equation. The four main factors examined are soil/geotextile adhesion, normal stress, deformation of junctions at the soil/fabric interface, and surface roughness. To evaluate interactive deformational modes of soil / geotextile systems, a pull-out test device was designed and constructed and used to test woven and nonwoven textiles. Identified interactive modes were divided into three main categories: pure slippage, complete rupture, and combined slippage and longi tudinal deformation. This categorization supported by the equation above can help rationalize the complex mechanism involved in pull-out conditions.

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Theory of Soil / Geotextile Interaction

Abstract

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