PERFORMANCE OF SHORING WALL IN DEEP EXCAVATION, CORNICHE TOWERS, ABU DHABI: A CASE STUDY

A case study of mixed use of diaphragm wall and secant pile wall as an earth retaining structure for deep excavation is reported. A shoring wall of approx. 26m deep from existing ground level is designed for proposed construction of four basements and multi-story building in Abu Dhabi. Diaphragm wall of 1m width and Secant pile wall of 1.2m diameter have been analysed by using finite element method with Plaxis 2D software in which they have been modelled as plate elements, ground anchors as node to node-to-node elements with embedded piles for fixed length, strut pipes as fixity points and soil layer and rock layers modelled as Harding Soil and Mohr Coulomb models respectively. During the excavation period, a monitoring instrumentations system including strain gauges for measuring loads on strut pipes and inclinometers for measuring the deflection of shoring wall have been implemented. Minor deflections have been observed in comparison to design estimation thereby confirming successful and safe performance of shoring wall.