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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
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