COMPARATIVE STUDY ON THE PULL-OUT RESPONSE OF NONWOVEN GEOTEXTILE IN DRY AND SATURATED SANDS

Ching-Chuan Huang ； Shih-Cieh Yin ； Hao-Yi Hsu

《Journal of GeoEngineering》 12卷3期 (2017/09) Pp. 97-107

https://doi.org/10.6310/jog.2017.12(3).1

摘要

A series of pull-out tests is performed to investigate the response of a heat-bonded nonwoven geotextile under both dry and saturated conditions. Modeling of the pull-out behavior for the dry and saturated sand conditions is also conducted based on a hyperbolic curve-fitting technique. A theory regarding the effective pull-out lengths in conjunction with the result of medium-scale direct shear tests on the soil-geotextile interface is used to facilitate the modeling for the pull-out force vs. displacement relationships. Test results show that both the peak pull-out strength and its associated pull-out displacement are lower in the case of saturated sand than those in dry sands due to the lubrication effect of water. The soil-saturation-induced different pull-out behavior is reflected in three key model parameters in the hyperbolic pull-out model. The hyperbolic pull-out model established here successfully simulates the observed behavior in terms of the initial stiffness, the peak pull-out resistance and its associated pull-out displacement for the tests with a pull-out failure mode. For the tests exhibiting tie-break failure, the proposed model tends to under-estimate the pull-out displacement at failure due to a lack of consideration for the tensile elongation of the tested geotextile.

關鍵字

Geosynthetics ； pull-out ； hyperbolic model ； interface frition angle ； dry sand ； saturated sand