Advanced Landfill Liner Systems

This work summarises the results of 27 research projects carried out within a DM15 million integrated research programme in Germany. The results show that the mechanical properties of earthen and cut-off materials can be improved and that testing methods and apparatus are available for the determination of critical values.

This book summarises the results of 27 research projects carried out within a DM15 million integrated research programme in Germany. The results show that the mechanical properties of earthen and cut-off materials can be improved and that testing methods and apparatus are available for the determination of critical values. The research programme provides a deeper understanding of the performance of construction materials and the long-term behaviour of landfill liners and this will all help in the future design of safer landfills.

* Introduction
* List of projects
Research overview
* Mechanical loading on earthen liners,damage due to subsidence
* Water balance, the risk of desiccation in earthen liners
* Contaminant transport, fundamentals and minimisation
* Physical, chemical and biochemical influences on mineral liner materials
* Construction techniques, quality management
* Cut-offs walls
* Safety and system amalysis
* Geotextile protective layer system for geomembranes
* Leachate drainage systems
* Conclusinons and outlook
Project reports
* Development of a safety concept for landfill liner systems
* Influence of mechanical loading on the performance of mineral landfill liners
* Investigation of limiting values of deformability for mineral landfill liners by simulation of deformations in 1:1 scale tests
* Construction tchniques in the construcion of composite landfill liners
* Development of proposals for liner structures - theoretical and experimental investigation
* Redox-dependent mineralogical and chemical changes in clayey landfill basal liners and their soil mechanical effects
* Maintenance of the functioning of landfill drainage systems
* Self-healing behaviour with regard to permeability of mineral sealing materials in disturbed landfill liners/liner systems
* Long-term behaviour of earthen layers in landfill basal liners, moisture balance under thermal effects
* Thermal effects on the barrier efficiency of composite liners - test field measurements
* Non-isothermal water and vapour movement below landfills: laboratory experiments on the computer simulations of desiccation in mineral liners
* Experimental and numerical studies of contaminant transport through mineral liners and resulting improvements in liner materials
* Investigation of the feasibility of mining techniques for the subsequent lining of existing landfills
* Hydraulic control mechanisms for landfill liner systems
* Geomembranes under punctiform loads
* Investigation into the long-term integrity of protective materials for geomembranes in landfill basal liners
* Practice-oriented investigation to improve geotextile protective layer system for geomembranes with regard to their long-term protective efficacy
* Investigations into the influence of the drainage aperture in plastic drainage pipes to optimise their long-term stability under landfill conditions
* Design of capillary barriers for capping of landfillls and contaminated sites
* Effects of overburden pressure and degree of drainage on the soil-water characteristics of earthen liners
* Stress-strain behaviour of high-density slurry materials for groundwater protection cut-off walls around landfills and contaminated land, development of practice oriented test methods and assessment criteria
* Optimising processing techniques for mineral landfill liner construction
* Permeability and stress-strain behaviour fo fibre-reinforced soils for landfill liner systems
* Investigations into the frost susceptibility of mineral landfill liners, problems affecting stability and precautions to be taken
* Influence of filter cake growth and solid matter shift on the quality, feasibility and cost of slurry trence cut-off walls
* Innovative construction materials for waste containment barriers: biochemical durability and contaminant transport
* Designing a method of total area leakage monitoring for landfill liners
* Appendix