Circular diaphragm wall for a deep shaft

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Publication Title
Circular diaphragm wall for a deep shaft

Abstract
This article presents a case study regarding a circular retaining structure adopted for a technological shaft constructed within an aluminium processing plant in Medieșu Aurit, Satu Mare County, Romania. Works were carried out in 2023 in order to accommodate a monolithic reinforced concrete structure with dimensions of 6.3m x 3.95 m, with the bottom slab level of -11.07m (from the reference elevation level, ±0.00m), and a piston with a diameter of approx. 1 m, laid at -18.30m. Geotechnical investigation indicates cohesive and semi-cohesive soils to a depth of 6.4 m, followed by a layer of gravel with sand and boulder to the depth of about. 39.4 m. The groundwater level is located at -6.4m with respect to natural ground level. A self-supporting circular diaphragm wall shaft was the adopted solution, which has been modelled by means of finite element method (FEM) in the two critical stages: Excavation down to -14.7m, taking into account the existence of water and water exhausting down to -11.30m, after high permeability soils in the bottom of the diaphragm wall have been replaced with low permeability layers of soil. The diaphragm wall shaft was executed from the working platform (constructed at level -2.70 m) down to -17.8 m, creating an internal diameter of 8.0 m, inside which, soil was excavated down to -14.70m (under water) and a concrete plug was poured with a thickness of about 3 m (replacing the excavated soil), to ensure up-lift resistance during temporary stage.
Authors
Christian Radu; D. Ciumeica; A. Boureanu; Lorand Sata

Published In

18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)

Theme

D - Current and new construction methods

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