The Experts below are selected from a list of 1305 Experts worldwide ranked by ideXlab platform
G. Stoltz - One of the best experts on this subject based on the ideXlab platform.
-
Assessment of long term water flow capacity of Geocomposites
2018Co-Authors: G. Stoltz, G. Bambara, N. Chaouch, D. Croissant, N. Touze-foltz, Angèle HeraultAbstract:In France, to design drainage Geocomposites into drainage and filtration systems, we have a new standard NF G38-061 (Afnor 2017). A major part of this standard is derived from a guide edited by the French Chapter of IGS (Comité Français des Géosynthétiques 2014). To design drainage Geocomposites on the long term, the standard NF G38-061 (Afnor 2017) takes into account the decrease over time of Geocomposite in-plane water flow capacity due to normal stress. Two phenomena are considered: the reduction of the composites thickness (compression of the drainage core) and simultaneously the intrusion of the geotextile filter into the drainage core in the case of soft boundary interface conditions. These two phenomena are assessed following two reduction factors that have to be applied to the in-plane water flow capacity of Geocomposite measured following the standard NF EN ISO 12958 (Afnor 2010). There are current discussion in ISO TC 221 WG4 in the framework of the creation of the NF EN ISO 12958 part 2 - performance test, especially about the time of compression of the specimen in the cell before the in-plane water flow capacity measurement. This paper deals with the methods to assess the long term in-plane water flow capacity of Geocomposites and discusses the time of compression of the specimen in the cell before the in-plane water flow capacity measurement is performed.
-
Equipement pour ouvrages étanchés et ouvrages en terre comprenant un géocomposite drainant associé à un dispositif de détection de fuites, d'infiltration ou d'écoulements d'un fluide.
2018Co-Authors: G. Stoltz, Y. Durkheim, Stefano Bonelli, L. Peyras, V. LamourAbstract:L'invention concerne un équipement pour ouvrages étanchés et ouvrages en terre (1) comprenant : - un géocomposite drainant (2) intégrant des drains (20) destinés à capter et à drainer de l'eau, le géocomposite drainant étant destiné à être positionné au contact d'un corps à protéger - un organe de collecte et d'évacuation (3) des eaux de drainage, les drains du géocomposite drainant étant conçus pour se déverser dans l'organe de collecte et d'évacuation - un dispositif de détection de fuites, d'infiltrations ou d'écoulements d'un fluide comprenant un réseau de capteurs étant constitué de fibres optiques (40) insérées à l'intérieur des drains.
-
Evaluation of the decrease in long term water flow capacity of Geocomposites due to filter intrusion
2014Co-Authors: N. Touze-foltz, Angèle Herault, G. StoltzAbstract:The French regulation on waste landfilling is under review. The use of drainage Geocomposites will be allowed to replace part of the granular drainage layer at the bottom of landfills provided equivalence is demonstrated. In this instance the knowledge of the behaviour of drainage Geocomposites on the long term has to be improved. Water flow capacity in the plane tests were performed with 4 drainage Geocomposites selected for their various types of drainage cores, during 7 days, with two types of contact area, either by applying the load through a rigid plate on the Geocomposite or through a foam layer in the testing equipment of EN ISO 12958. These tests were performed under a 200 kPa load. Results obtained will be given. They allow to evidence the influence of the type of the contact area on the hydraulic performance of the products. Thanks to this work, the intrusion phenomenon of the filter inside the geospacer could also be identified and quantified to be introduced in the long term design of in-plane flow capacity of drainage Geocomposites with other parameters like the compressive creep behavior of the drainage core. These test results were used to update (1) a guide on drainage and filtration recently published by the French chapter of the International Geosynthetics Society, and (2) the French standard NF G38-061 dedicated to the design of geosynthetic drainage systems.
Angèle Herault - One of the best experts on this subject based on the ideXlab platform.
-
Assessment of long term water flow capacity of Geocomposites
2018Co-Authors: G. Stoltz, G. Bambara, N. Chaouch, D. Croissant, N. Touze-foltz, Angèle HeraultAbstract:In France, to design drainage Geocomposites into drainage and filtration systems, we have a new standard NF G38-061 (Afnor 2017). A major part of this standard is derived from a guide edited by the French Chapter of IGS (Comité Français des Géosynthétiques 2014). To design drainage Geocomposites on the long term, the standard NF G38-061 (Afnor 2017) takes into account the decrease over time of Geocomposite in-plane water flow capacity due to normal stress. Two phenomena are considered: the reduction of the composites thickness (compression of the drainage core) and simultaneously the intrusion of the geotextile filter into the drainage core in the case of soft boundary interface conditions. These two phenomena are assessed following two reduction factors that have to be applied to the in-plane water flow capacity of Geocomposite measured following the standard NF EN ISO 12958 (Afnor 2010). There are current discussion in ISO TC 221 WG4 in the framework of the creation of the NF EN ISO 12958 part 2 - performance test, especially about the time of compression of the specimen in the cell before the in-plane water flow capacity measurement. This paper deals with the methods to assess the long term in-plane water flow capacity of Geocomposites and discusses the time of compression of the specimen in the cell before the in-plane water flow capacity measurement is performed.
-
Evaluation of the decrease in long term water flow capacity of Geocomposites due to filter intrusion
2014Co-Authors: N. Touze-foltz, Angèle Herault, G. StoltzAbstract:The French regulation on waste landfilling is under review. The use of drainage Geocomposites will be allowed to replace part of the granular drainage layer at the bottom of landfills provided equivalence is demonstrated. In this instance the knowledge of the behaviour of drainage Geocomposites on the long term has to be improved. Water flow capacity in the plane tests were performed with 4 drainage Geocomposites selected for their various types of drainage cores, during 7 days, with two types of contact area, either by applying the load through a rigid plate on the Geocomposite or through a foam layer in the testing equipment of EN ISO 12958. These tests were performed under a 200 kPa load. Results obtained will be given. They allow to evidence the influence of the type of the contact area on the hydraulic performance of the products. Thanks to this work, the intrusion phenomenon of the filter inside the geospacer could also be identified and quantified to be introduced in the long term design of in-plane flow capacity of drainage Geocomposites with other parameters like the compressive creep behavior of the drainage core. These test results were used to update (1) a guide on drainage and filtration recently published by the French chapter of the International Geosynthetics Society, and (2) the French standard NF G38-061 dedicated to the design of geosynthetic drainage systems.
Taro Kanemaru - One of the best experts on this subject based on the ideXlab platform.
-
effects of geosynthetic reinforcement type on the strength and stiffness of reinforced sand in plane strain compression
Soils and Foundations, 2007Co-Authors: Warat Kongkitkul, Daiki Hirakawa, Fumio Tatsuoka, Taro KanemaruAbstract:The effects of geosynthetic reinforcement type on the strength and stiffness of reinforced sand were evaluated by performing a series of drained plane strain compression tests on large sand specimens. The reinforcement type is described in terms of the degree of unification of the constituting components (for Geocomposites) as well as the tensile strength and stiffness, the covering ratio and others (for Geocomposites and geogrids). Sand specimens reinforced with different geosynthetic reinforcement types exhibited significantly different reinforcing effects. A Geocomposite made of a woven geotextile sheet sandwiched firmly with two sheets of non-woven geotextile, having a 100% effective covering ratio, exhibited reinforcing effects higher than typical stiff and strong geogrids. With some Geocomposite types, the reinforcing effects increase substantially by better unifying longitudinally arranged stiff and strong yarns and non-woven geotextile sheets. When fixed firm to the yarns, the non-woven geotextile sheets function like the transversal members of a geogrid by locally transmitting load activated by interaction with the backfill to the yarns. These Geocomposites can exhibit reinforcing effects equivalent to those with stiff and strong geogrids. Local strain fields of the specimens are presented to show that, for reinforced sand, the peak stress state reached is always associated with the development of shear band(s) in the sand and a higher peak strength is achieved when the strain localisation starts at a larger global axial strain due to better reinforcing effects.
Joseph Scalia - One of the best experts on this subject based on the ideXlab platform.
-
properties of geosynthetics exhumed from a final cover at a solid waste landfill
Geotextiles and Geomembranes, 2010Co-Authors: Craig H Benson, Emre I Kucukkirca, Joseph ScaliaAbstract:Abstract Samples of Geocomposite drain (GCD), geomembrane (GM), and geosynthetic clay liner (GCL) were exhumed from a final cover at a solid waste landfill to assess their condition after 4.7–5.8 yr of service. Permittivity of the GCD diminished by a factor of 3.9, but the transmissivity was higher than published by the manufacturer. Ply adhesion of the GCD diminished by a factor of 2.0. Geonet ribs in the Geocomposite drain (GCD) contained a light coating of fines and plant roots, but there was no evidence of significant clogging. The geotextile on the upper surface of the GCD met the commonly used criterion for filtration (AOS
N. Touze-foltz - One of the best experts on this subject based on the ideXlab platform.
-
Assessment of long term water flow capacity of Geocomposites
2018Co-Authors: G. Stoltz, G. Bambara, N. Chaouch, D. Croissant, N. Touze-foltz, Angèle HeraultAbstract:In France, to design drainage Geocomposites into drainage and filtration systems, we have a new standard NF G38-061 (Afnor 2017). A major part of this standard is derived from a guide edited by the French Chapter of IGS (Comité Français des Géosynthétiques 2014). To design drainage Geocomposites on the long term, the standard NF G38-061 (Afnor 2017) takes into account the decrease over time of Geocomposite in-plane water flow capacity due to normal stress. Two phenomena are considered: the reduction of the composites thickness (compression of the drainage core) and simultaneously the intrusion of the geotextile filter into the drainage core in the case of soft boundary interface conditions. These two phenomena are assessed following two reduction factors that have to be applied to the in-plane water flow capacity of Geocomposite measured following the standard NF EN ISO 12958 (Afnor 2010). There are current discussion in ISO TC 221 WG4 in the framework of the creation of the NF EN ISO 12958 part 2 - performance test, especially about the time of compression of the specimen in the cell before the in-plane water flow capacity measurement. This paper deals with the methods to assess the long term in-plane water flow capacity of Geocomposites and discusses the time of compression of the specimen in the cell before the in-plane water flow capacity measurement is performed.
-
Evaluation of the decrease in long term water flow capacity of Geocomposites due to filter intrusion
2014Co-Authors: N. Touze-foltz, Angèle Herault, G. StoltzAbstract:The French regulation on waste landfilling is under review. The use of drainage Geocomposites will be allowed to replace part of the granular drainage layer at the bottom of landfills provided equivalence is demonstrated. In this instance the knowledge of the behaviour of drainage Geocomposites on the long term has to be improved. Water flow capacity in the plane tests were performed with 4 drainage Geocomposites selected for their various types of drainage cores, during 7 days, with two types of contact area, either by applying the load through a rigid plate on the Geocomposite or through a foam layer in the testing equipment of EN ISO 12958. These tests were performed under a 200 kPa load. Results obtained will be given. They allow to evidence the influence of the type of the contact area on the hydraulic performance of the products. Thanks to this work, the intrusion phenomenon of the filter inside the geospacer could also be identified and quantified to be introduced in the long term design of in-plane flow capacity of drainage Geocomposites with other parameters like the compressive creep behavior of the drainage core. These test results were used to update (1) a guide on drainage and filtration recently published by the French chapter of the International Geosynthetics Society, and (2) the French standard NF G38-061 dedicated to the design of geosynthetic drainage systems.