Secant piles pit enclosure made with deep soil mixing columns and CFA piles

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Publication Title
Secant piles pit enclosure made with deep soil mixing columns and CFA piles

Abstract
This article presents an alternative solution for an excavation pit within a residential project in Târgu Mureş (Romania). Secant deep soil mixing columns in addition to CFA piles, proves to be a very effective, environmentally friendly (lower carbon footprint), cost and time saving solution, compared to traditional secant piles pit enclosure. Main challenge was to find an effective solution to build a proper dimensioned retaining wall considering not only the excavation depth, surrounding buildings, nearby streets and traffic but also restrained site dimensions. Given the non-cohesive soil layer, which is 2 metres thick, and due to the presence of ground water within, it was important just to seal this layer, to prevent water in- flow into the excavation pit. Deep soil mixing columns were 600 mm diameter and were done by the means of a special tool having three levels of mixing paddles. Calibration of grout flow, advancement speed and mixing rpms were very important for obtaining the proper BRN (blade rotation number) adapted to the soil conditions on the site. All criteria were monitored real-time using monitoring devices installed on the drilling rig and pumps. Design criteria, technology presentation and effective response of the solution are presented further.
Authors
A. Boureanu; D. Ciumeica; A. Magureanu; 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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