Solution of earth retaining structure using Cutter Soil Mixing technology: 'Parking Saint Nicolas' Project at Cannes, France

摘要

This paper presents the most relevant design and execution aspects of a peripheral retaining structure for the construction of "Parking Saint Nicolas ", an underground parking lot located at Cannes, France. The retaining wall to the construction of the four underground floors was executed through soil-cement panels by the application of deep soil mixing technology, particularly the Cutter Soil Mixing (CSM) technology, reinforced with vertical steel piles. Taking in account the constrains related to the urban surrounding, including the proximity of buildings and streets, were implemented two levels of reinforced concrete slab bands at the levels of floors "0" and "-2", creating a rigid support system of the four elevations. The slab bands were incorporated on the final structure of the building and with this solution was dispensed the execution of ground-anchors with big lengths that would lead to the occupation of the neighbour underground. This solution brought some economic benefits, especially due to the incorporation of elements used in the final structure at the preliminary stage of the work. The main objectives of the retaining wall solution were allow the vertical excavation assuring simultaneously the stability of nearby structures and infrastructures, and also reduce the inflow of water into the interior of the excavation during the construction phase. The main results of modelling, instrumentation, monitoring and quality control of the work are also presented.