Effects of Specimen Size in Transmissivity Tests of Biplanar Geonets and Geocomposites

Zimmel, E.; Li, M.; Youngblood, Jerry E.

doi:10.1061/41165(397)225

Geo-Frontiers 2011 2011

DOI: 10.1061/41165(397)225

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Effects of Specimen Size in Transmissivity Tests of Biplanar Geonets and Geocomposites

E. Zimmel¹,

M. Li²,

Jerry E. Youngblood³

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“…Using Darcy's law, all values of flow rate are corrected by the amount of water flowing in the sand (the coefficient of permeability of sand, k s ¼ 5 3 10 À5 m/s, is taken from the product datasheet). Zimmel et al (2011) showed that specimen size can significantly affect standard transmissivity tests. Using either ASTM D4716-08 or ISO 12958:2010, transmissivity measurements were performed with a small-scale apparatus (at most 0.305 m wide).…”

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confidence: 99%

Multiscale transmissivity study of drain-tube planar geocomposites: effect of experimental device on test representativeness

Bourgès-Gastaud¹,

Blond²,

Touze-Foltz³

2013

Geosynthetics International

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Hydraulic transmissivity is the most important design parameter of geocomposites used for in-plane drainage applications. This paper presents an in-depth investigation of the hydraulic behaviour of drain-tube planar geocomposites (DTPGs) and characterises the locations and causes of head losses based on a multiscale experimental approach using three different apparatus. In particular, a transmissivity rig that accommodates specimens up to 1 m2 was developed to define the minimum representative surface area required to characterise DTPGs. The experimental data acquired in this study support a theoretical relationship linking head losses that occur within DPTGs to flow rate. This relationship is used to analyse the results obtained with other transmissivity rigs and to identify the key locations where head losses develop. In addition, evidence that Colebrook’s equation can be applied to corrugated tubes is presented. Based on this study, it is concluded that the measured DTPG transmissivity is significantly affected by specimen length and by the experimental device used to make the measurement. For example, the DTPG transmissivity measured in accordance with ASTM D4716-08 was found to be 14% lower than the actual DTPG transmissivity

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confidence: 99%

Multiscale transmissivity study of drain-tube planar geocomposites: effect of experimental device on test representativeness

Bourgès-Gastaud¹,

Blond²,

Touze-Foltz³

2013

Geosynthetics International

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Hydraulic transmissivity of geocomposite confined with soils

et al. 2021

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Effects of Specimen Size in Transmissivity Tests of Biplanar Geonets and Geocomposites

Cited by 2 publications

References 1 publication

Multiscale transmissivity study of drain-tube planar geocomposites: effect of experimental device on test representativeness

Multiscale transmissivity study of drain-tube planar geocomposites: effect of experimental device on test representativeness

Hydraulic transmissivity of geocomposite confined with soils

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