UPGRADING THE STABILITY OF THE EDER MASONRY DAM WITH PRESTRESSED VERTICAL ANCHORS

摘要

The 47 m high Eder masonry dam was built of graywacke quarry-stones and lime trass mortar in 1908-1914. Some years ago the dam stability was reinvestigated which the consequence that the storage level had to be lowered. Prestressed permanent anchors, reaching from the top of the dam down to approximately 30 metres into the bedrock, were installed in order to achieve dam stability according to todays standards. The anchors, placed with 2.25 m spacing, were prestressed with an anchorforce of 4 500 kN each. The paper describes the stability analyses and the installation of the prestressed anchors.