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Slope reinforcement in the waste disposal site Ahrental (Tyrol, Austria)

Project overview:

Within the scope of an intended expansion of the authorised dumping ground Ahrental, situated to the south of Innsbruck (Austria), a huge slope reinforcement had to be constructed along the main access road of the site. The slope itself was known for its instabilty noticeable by frequent rock falls and small scaled slumping. The implemented actions included the removal of a large part of the instable slope (cut mass app. 44.000 m³) and the construction of a 380 m long and up to 29 m high reinforcement consisting of a sum of 518 pre-stressed rock anchors with a total length of over 14 km.

The reinforcement design was based on the results of geotechnical mapping, a comprehensive site investigation with borehole drillings and an intense geotechnical monitoring. The anchor lengths were defined during construction by means of further bore hole drillings and a complete geotechnical documentation of the rock structures in the cut. 

Services provided:

  • Geological mapping
  • Site investigation with bore hole drillings
  • Development of an underground model 
  • Development of a reinforcement design (anchor wall with prestressed anchors [live loads 650 - 1300 kN], shotcrete, IBO self-drilling anchors etc.)
  • Elaboration of a tender
  • Statics engineering 
  • Geotechnical dokumentation and geotechnical site supervision during construction
  • Geotechnical monotoring (inclinometers, extensometers, load cells)

Client:   Innsbrucker Kommunalbetriebe AG, Abteilung Abfallwirtschaft

Period: 1994 - 1996