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Romania has a large number of waste dumps and unconfirmed landfills and their closing should be a priority. An adequate design of a closing system should consider parameters such as friction resistance on the various involved interfaces, between geosynthetic materials and soils. These parameters can be determined experimentally by direct shear tests or using the inclined plane test. In the Geotechnical and Foundation laboratory of UTCB an inclined plane apparatus (a device which, despite its simplicity, does not exist in Romania) has been developed. The inclined plane test is used to determine the interface characteristics of two geosynthetic materials or a geosynthetic material in contact with a soil. This test is used mainly in situations where vertical stresses are low, such as cover systems for landfills or for erosion control of slopes. The paper presents the principle of this method and how to determine the angle of friction at the interface in accordance to SR EN ISO 12957-2 "Determination of friction characteristics. Part 2: Inclined plane test". It also presents the calibration of an inclined plane device made in the Geotechnical and Foundation laboratory, together with the experimental program and the results obtained with this device, as well as a comparison with the results of a previous direct shear experimental program. [ABSTRACT FROM AUTHOR]

The issues regarding waste landfills are still actual in Romania, but also worldwide, due to the increasing volumes of waste and their impact on the environment. In landfill design geosynthetic materials are used, some of them being required by law. Their use and especially the design of the projects in which they are implemented is often poor. The paper presents some of the actual issues on geosynthetic materials used in landfills, illustrated by some case studies. [ABSTRACT FROM AUTHOR]