Ulster University Logo

Ulster Institutional Repository

Effects of granular columns in compacted fills

Biomedical Sciences Research Institute Computer Science Research Institute Environmental Sciences Research Institute Nanotechnology & Advanced Materials Research Institute

Sivakumar, V., Boyd, JL, Black, J. A. and McNeil, J. A. (2010) Effects of granular columns in compacted fills. Proceedings of the Institution of Civil Engineers Geotechnical Engineering, 163 (GE4). pp. 189-196. [Journal article]

Full text not available from this repository.

DOI: 10.1680/geng.2010.163.4.189

Abstract

Compacted fills are frequently used in engineering construction where site levels need to be raised. Increased environmental restrictions, coupled with the growing cost of virgin aggregate, have prompted more widespread reuse of site-won fill from earthworks. It is well established that the subsequent behaviour of the fill is highly related to the nature of its placement, which, if not correct, can lead to significant future difficulties. When placed, fills are generally unsaturated; however, over time they may experience an increase in water content owing to infiltration arising from rainwater, surface runoff or groundwater recharge. This saturation process can be accompanied by substantial changes in volume or reduction in shear strength; these can result in large and often non-uniform ground movements, which typically cause loss of serviceability. Previous research has indicated that such effects may be reduced through the use of ground improvement techniques such as granular columns. The work reported in this paper examines the performance of both engineered and unengineered compacted fills, prepared at four different initial moisture contents within 2% of optimum prior to saturation. Specimens were prepared by mixing kaolin and well-graded medium sand at a ratio of 1:9. Two loading conditions were considered: (a) monotonic loading and (b) static loading, during which saturation occurred. The performance of the ground improvement was examined by introducing a single 32 mm diameter granular column. In addition, the possibility of column strengthening was also considered by encasing the column in geogrid reinforcement and cement stabilisation. The results have shown that the inclusion of granular columns in unengineered cohesive fill improved the overall bearing capacity and settlement performance; however, a marginal reduction in performance was observed in the engineered fill specimens.

Item Type:Journal article
Keywords:geotechnical engineering / sustainability
Faculties and Schools:Faculty of Art, Design and the Built Environment
Faculty of Art, Design and the Built Environment > School of the Built Environment
Research Institutes and Groups:Built Environment Research Institute
Built Environment Research Institute > Centre for Sustainable Technologies (CST)
ID Code:14804
Deposited By:Dr Jane Boyd
Deposited On:11 Aug 2010 12:02
Last Modified:11 Aug 2010 12:02

Repository Staff Only: item control page