Cover of a landfill for drilling mud

A basin shaped mud landfill with a size of approx 80 x 100 m had to be covered. The approx. 4m thick mud was not drained and, therefore, had a pulpy consistency in wide areas. The covering system which was carried out basically consisted of a carrier and drainage layer made of geogrids and brushwood fascines, sand for the profilation of a roof profile, and a sealing consisting of a bentonite liner. A robust composite material (woven plus nonwoven) was installed on top of the fascine layer to form the separation layer. Thus the usage of five different geotextile layers in total, arranged in three planes, allowed the economic and safe construction of an efficient covering system on top of an extremely difficult subsoil. This paper shall present and explain the marginal conditions which were relevant for the dimensioning and selection of the different geotextile materials. A comparison with other possibilities not using geotextiles will show the advantages of the chosen and executed solution. Slides will illustrate the construction procedure and the solution of construction details.