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The Effect of Displacement Rate on Shear Characteristics of Geotextile-involved Ceosynthetic Interfaces  

김진만 (Hyundai Institute of Construction Technology)
Publication Information
Journal of the Korean Geotechnical Society / v.19, no.1, 2003 , pp. 173-180 More about this Journal
Abstract
In spite of its potential importance in the assessment of geosynthetic-related dynamic problems, no serious attempt has yet been made to investigate a probable dependence of dynamic friction resistance of the geosynthetic interface on shear displacement rate. Hence, an experimental study of geosynthetics was carried out on a shaking table, and the relationship between dynamic friction resistance and shear displacement rate of geosynthetic interfaces was investigated. A cyclic, displacement rate-controlled experimental setup was used. The subsequent multiple rate tests showed that interfaces that involve geotextiles have such unique shearing characteristics that shear strengths tend to increase with displacement rate. In contrast, once submerged with water, the shear strength appears to be no longer dependent on the displacement rate, partly due to lubrication effect of water trapped inside the interface. The results of the experimental study can be used in the seismic safety assessment of a landfill cover and slope where the geosynthetic materials are exposed to a relatively low normal stress.
Keywords
Dynamic resistance; Geosynthetics; Geotextile; Shaking table; Shear characteristics;
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