Soil—geotextile

Espinoza RD. Soil-geotextile interaction evalnation of membrane snpport. Geotextiles and Geomembranes 1994 13 281-93. 

The principle behind all permeability criteria is that the flow of water will not be impeded at the soil/geotextile interface, and this means the permeability of the geotextile (kg,extue) ust be greater than the permeability of the soil (k >u),i.e. 

Swan, R. H. (1987), The influence of fabric geometry on soil/geotextile shear strength. Geotextiles Geomembranes, 6,81-87. 

Richards, E. A. and Scott, J. D. (1985), Soil geotextile friction properties. Second Canadian Symposium on Geotextiles and Geomembranes, Canadian Geotechnical Society, Edmonton, Alberta September. 

Athanasopoulos, G. A. (1996), Results of direct shear tests on geotextUe reinforced cohesive soil. Geotextiles and Geomembranes, 14,619-644. 

Alawaji, H. A. (2001), Settlement and bearing capadty of geogrid-reinforced sand over collapsible soil. Geotextiles and Geomembranes, 19, pp. 75-88. 

Mogahzy, Y. E. E., Gowayed, Y., Elton, D. (1994). Theory of soil/geotextile interaction. Textile Research Journal, 64(12), 744—755. 

Mlynarek, j., Rollin, A. L., Lafleur, J. Bolduc, G. 1990. Microstructural analysis of a soil/geotextile system. In Peggs, 1. D. (ed.) Geosynthetics Microstructure and Performance. ASTM STP 1076, American Society for Testing and Materials, Philadelphia, 137-146. 

According to the filtration function, a geotextile filter must be able to retain fine particles of base soil (retention criterion) and avoid the development of excessive pore water pressure on a soil geotextile interface (ie, fi ee flow of liquid through the geotextile plane) (permeabihty criterion). 

Filtration can be defined as a soil—geotextile system in equilibrium that allows for adequate liquid flow with hmited soil loss across the plane of the geotextile over a lifetime of service compatible with the application under consideration (Koerner, 2005). Therefore, the filter function refers to geotextile pore size distribution (PSD) or filtration opening size and to the geotextile cross-plane permeability (or permittivity). 

According to Palmeira et al. (2005), the definition of GR based on water head measurements closer to the geotextile filter interface is recommended to predict the soil—geotextile interaction mechanisms more accurately. 

After the test, the permeabihty of the geotextile normal to the plane, the permeability of the soil—geotextile filtering system, clogging, and blinding levels are evaluated. 

In all hydraulic applications, the base soil—geotextile interaction is a complex process and many factors related to the base soil, the geotextile filter, and the boundary conditions are involved (Table 8.2). 

Table 8.2 Factors affecting soil—geotextile filter interaction (Moraci et al., 2010)...

ASTM D5101. Standard Test Method for Measuring the Soil-geotextile Clogging Potential by Gradient Ratio. ASTM International, USA. 

Faure, Y., Gourc, J.P., Brochier, P., RoUin, A., 1986. Soil-geotextile interaction in filter systems. In Proc. of the 3rd International Conference on Geotextiles, Wien, Austria, vol. II, 671-676. 

Palmeira, E.M., Gardoni, M.G., Bessa da Luz, D.W., 2005. Soil-geotextile filter interaction under high stress levels in the gradient ratio test. Geosynthetics International 12,162—175. 

Lafleur, J., 1999. Selection of geotextiles to filter broadly graded cohesionless soils. Geotextiles and Geomembranes 17 (5—6), 299—312. 

Soil—geotextile interaction in pull-out mode The geotextile length for slope and wall reinforcement is designed to provide anchorage beyond the potential failure surface. Such resistance can be modeled in the laboratory using a puU-out test. The pull-out resistance of the geotextile obtained in the test can be expressed as (Eq. [15.6]) ... 

Tear strength, elongation at tear, stress-elongation behavior, creep, crawl, friction (soil-geotextile)... 

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