feature stories | managing geotechnical risks: landslide at athmenia 1 Axi s down strea m Client: Ministry of Water Resources Client’s representative: Agence Nationale des Barrages (ANBT) Consultants: Dar Al-Handasah (Shair and Partners) in association with JacobsGIBB Inc. Project: Final design and supervision of construction of the reservoir Dam of Oued, Athmenia Contractor: JV ENKA-KOUGC-GECET-NASTON (Turkey/Algeria) with RONA and KASKTAS (Turkey) Location: Oued Athmenia, Eastern Algeria 5 2 3 4 Layer 1 st nd Nature Lacustrine limestone and clay Slide zone soft clay / weathered claystone Compact claystone Geological Age Pliocene Miocene Miocene 2 3rd The geological formation of the site is sedimentary. The borehole results produced the three-layered geological profile. 1 Dam site prior to excavation works, the limestone formation is visible on the left abutment 2 K1 site excavation in April 2004, seen from the side of the slide 3 Magnitude of the fissures in the mass of the slide 4 Micropile retaining screen reinforced with metalic tubes, during construction 5 Close to completed repair works seen from the right bank; the micropile retaining screen perpendicular to the slide’s direction and the four stabilizing anchor rows 44