Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Sand Columns


Sand Column Stabilized by Silica Fume Embedded in Soft Soil

Hussein H. Karim; Zeena W. Samueel; Mohammed S. Mohammed

Engineering and Technology Journal, 2016, Volume 34, Issue 6, Pages 1047-1057

This research aims to study the behavior of the sand columns stabilized with silica fume (as an additive with different percentages) and driven in soft soil bed with undrained shear strength (cu) between 16 – 21 kPa. Holesin the shape of columns with diameter 50 mm and length 300 mm have been drilled in a soil bed and backfilled with sand mixed with several proportions of silica fume with 7-days curing. A rigid circular footing with diameter 64.6 mm was located on each column and loaded axially till failure. The results analysis of the model tests indicated an encouraging improvement in load carrying capacity of the columns and considerable reduction in the settlement compared to the conventional stone columns. The bearing improvement ratio and settlement reduction ratio exhibited by the sand columns are 1.18 and 0.71, respectively. The best possible addition of silica fume content in sand–silica fume columns is 7% giving bearing improvement ratio and settlement reduction ratio of 1.56 and 0.5 respectively.

Single Sand Column Stabilized by Lime Embedded in Soft Soil

Ahmed S.A. Al-Gharbawi; Hasan H. Joni; Namir K.S. Al-Saoudi

Engineering and Technology Journal, 2014, Volume 32, Issue 4, Pages 1028-1037

The behavior of isolated sand columns stabilized with lime and embedded in bed of soft soil of untrained shear strength cu between 16 – 19 kPa, is investigated. Holes in the form of columns 50 mm in diameter and 300 mm in length were excavated in a bed of soil and backfilled with sand mixed with various percentages of lime and cured for 7 days. A rigid circular footing 64.6 mm in diameter was placed on each column and loaded axially up to failure. The analysis of the model test results showed encouraging improvements of the load carrying capacity of the columns and significant reduction in the settlement over the conventional stone columns.