Behaviour of weak soils reinforced with soil cement columns formed by the deep mixing method: Rigid and flexible footings. (May 2015)

• Record Type: Journal Article
• Authors: A. Rashid, Ahmad Safuan; Black, Jonathan A.; Kueh, Ahmad Beng Hong; Md Noor, Norhazilan
• Is Part Of: Measurement. Volume 68(2015:May)
• Page Start: 262
• Page End: 279
• Publication Date: 2015-05
• Subjects: Bearing capacity -- Deep Mixing (DM) -- Rigid and flexible footings -- Particle Image Velocimetry (PIV); Weights and measures -- Periodicals; Measurement -- Periodicals; Measurement; Weights and measures; Periodicals; 530.8
• DOI: 10.1016/j.measurement.2015.02.039
• Languages: English
• ISSNs: 0263-2241

Abstract

Highlights: Bearing capacity (BC) was better by 168% for the fully penetrated of the untreated case. Bearing capacity for partially penetrated was better by 80% of the untreated case. Similar BC and failure mechanism was achieved under the rigid and flexible footing. Ultimate Limit State analysis provides good agreement with laboratory results. The columns failed by a combination of shear and bending failure. Abstract: This paper presents a comparison of the failure behaviour of the Deep Mixing (DM) method under models of rigid and flexible foundations. A series of physical model tests at 1 g were performed in this study consisting of unreinforced and fully and partially penetrated soil–cement columns. For the improvement case, the columns of 23.5 mm diameter and lengths of 200 and 100 mm were installed in the ground model with an improvement area ratio, ap, of 26.0%. The failure mechanism was measured using close range photogrammetry and Particle Image Velocimetry (PIV). For verification, the bearing capacity performance and failure mechanisms were then compared with the Ultimate Limit State numerical analysis and the existing analytical solution proposed by Boussida. The results show a good agreement between the bearing capacity value obtained from the experiment and the numerical software.