Research Information System
16th European Conference on Soil Mechanics and Geotechnical Engineering, ECSMGE 2015, Edinburgh, England, 13 - 17 September 2015, vol.2, pp.565-570, (Full Text)
This paper presents the design, construction and performance of an anchored diaphragm wall utilizing Single Bore Multiple Anchor (SBMA) technology to support one of the largest basement excavations in Moscow, Russia. The geotechnical challenge was to ensure the safe and viable construction of the five-level basement, which required a 25m deep excavation within a heavily urbanized location. For this purpose a 26,500 m2 diaphragm wall, with a total depth of 45m, was designed incorporating 6-levels of temporary ground anchors. A number of trial tests were performed prior to the commencement of the anchoring works in order to establish the in situ ultimate bond capacity in the founding stratum. The ground conditions encountered at the proposed site comprised mixed soils of mainly silt interspersed with sand and clay lenses/pockets. The displacement of the reinforced concrete diaphragm wall and the associated effects of these movements on the adjacent structures were analyzed using finite element methods and compared with measurements of lateral displacements monitored during the course of excavation. The effectiveness of the SBMA technology was demonstrated by the fact that maximum cumulative recorded wall movements were restricted to less than 65 mm for the 25m deep excavation.