A PROBABILISTIC ASSESSMENT OF CLAY LINER HYDRAULIC CONDUCTIVITY

The overall objective of this study was to review the issues relating to the setting of permeability limits and evaluate the use of probabilistic assessment techniques for assessing the degree of compliance with specifications. Specifically, the objectives were:
- Establish the precision and variability inherent in selected sampling and testing methods for a constructed clay landfill wall by statistical techniques;
- Review the applicability of indirect testing in the prediction of permeabilities; and
- Provide recommendations for the future use of probabilistic techniques in relation to verification of quality of construction of clay structures in landfills.

The hydraulic conductivity requirement for mineral liners used in landfill applications is generally required to be no greater than 1x10-9 m/s. However, the assessment of lining system performance is often carried out using stochastic techniques with a probability density function used to describe the clay hydraulic conductivity values used. This paper presents the results of a programme of sampling and laboratory testing of an engineered clay liner in which sampling methods, testing methods and statistical modelling techniques were investigated to assess their importance with respect to liner performance.



Copyright: © IWWG International Waste Working Group
Quelle: Specialized Session E (Oktober 2007)
Seiten: 10
Preis: € 10,00
Autor: Dr. D. Russell V. Jones
D.H. Hall

Artikel weiterleiten In den Warenkorb legen Artikel kommentieren


Diese Fachartikel könnten Sie auch interessieren:

FIELD TESTS ON LANDFILL CLAY BARRIER SUBMITTED TO LOCAL SUBSIDENCE
© IWWG International Waste Working Group (10/2007)
Since 2003, the french radioactive waste agency ANDRA is responsible for the site for the storage of very low level nuclear waste, located in the Aube, in France. This kind of disposal facility requires a lot of precautionary measures. To ensure the radioactive waste containment, the confinement of the capping cover of the storage cells is obtained by the association of a compacted clay layer and a geomembrane (Camp et al., 2005). The cross section of the barrier is presented on the Figure 2. Due to the structure of the capping system, there is a risk of damage of the geomembrane due to the compaction of the overlying clay layer. So, compaction energy has to be relatively weak not to damage this one.

EFFICIENCY OF DIFFERENT GEOTEXTILES FOR THE PROTECTION OF THE GEOMEMBRANE AT LANDFILLS
© IWWG International Waste Working Group (10/2007)
Characterisation of the efficiency of geotextiles to protect geomembranes against puncture within the installation of the drainage layer at the landfill bottom liner is a key parameter to ensure the respect of the active barrier performance defined in the legislation. Geotextiles are then used within the constitution of the active barrier of landfills in order to protect the geomembrane against puncture due to the installation of the gravels drainage layer and of the coming waste mass weight above the barrier. These geotextiles have to be designed for this use. To date, two tests are normalised: static and dynamic puncture tests. The results of these tests are indicated on all the technical documents describing a protection geotextile.

MINERAL TRANSFORMATIONS IN STEEL SLAG USED AS LANDFILL COVER LINER MATERIAL
© IWWG International Waste Working Group (10/2007)
Slags from steel making are in many cases valuable materials that can be reused. Potential areas for reuse are construction applications, e.g. in roads, pavements for dormant trafficas parking lots, or for dense liners in a landfill base or cover constructions. The reuse of residuals avoids landfilling of those materials and minimizes the exploitation of natural raw materials for construction purposes. Often, construction costs can be reduced.

COUPLED SOLUTION TO HEAT INDUCED DEGRADATION OF CONTAINMENT BARRIERS
© IWWG International Waste Working Group (10/2007)
The regulatory controls for preventing contaminants migrating into the surrounding environment call for a containment barrier system generally provided by means of leachate collection systems, liners, leak detection systems (LDS) and secondary liners to give effect to the LDS.

Ertüchtigung der Basisabdichtung bzw. Zwischenabdichtung der Deponie Steinmühle - Pilotprojekt mit Trisoplast in der Basis
© Wasteconsult international (12/2010)
Infolge der Neuordnung des Deponierechtes seit 2002 haben sich die Anforderungen an die Abfallwirtschaft und an die Deponietechnik stark geändert, so dass der Bedarf an Deponien der Klasse 1 immer stärker in den Focus der Entsorgungswirtschaft rückt. Diesem Umstand trägt die Entsorgungswirtschaft insoweit Rechnung, dass immer mehr Betreiber die Ertüchtigung oder auch die Neuanlage einer Deponie der Klasse 1 erwägen. Im folgenden Beitrag wird die in Deutschland erste Ertüchtigung einer bestehenden Deponie mit dem Abdichtungsmaterial Trisoplast in der Basis beschrieben.

Name:

Passwort:

 Angemeldet bleiben

Passwort vergessen?