Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Relative density


Effect of the Slenderness Ratio of Piles on Ultimate Lateral Resistance in Sandy Soil

Iman A. Ali; Saad F. Abbas; Karim H. Ibrahim

Engineering and Technology Journal, 2021, Volume 39, Issue 12, Pages 1740-1747
DOI: 10.30684/etj.v39i12.105

This research presents the results of 14 tests, where the pile is subjected to static lateral loads. The tests are carried out on pile models with different length / diameter ratios embedded in sand with different relative densities. The influence of embedment length to diameter ratios (L/D), relative density and mode of failure of the pile on the ultimate lateral resistance of piles are investigated. A series of different ratios of embedded length to constant diameter ranging from 12 to 30 was used to perform this study. From the results of the experimental models, it is found that, the length to diameter ratio is a significant variable that influences the ultimate resistance of the piles, where lateral static loads were employed to the single pile by a static lateral load using a device designed for this purpose, and due to the static lateral load the pile was deflected. The ultimate lateral resistance of a pile is investigated to specify the behavior of the pile under the effect of lateral loads as a rigid or flexible pile.

Ordinary and Encased Stone Columns with Two Different Relative Densities

Namir K. S. Al-Saoudi; Mohammad M. M. Al-Kaissi; Sarah E. K. Al-Baiaty

Engineering and Technology Journal, 2013, Volume 31, Issue 13, Pages 2415-2432

Stone columns technique is most commonly used in increasing bearing capacity,
reduces and controls the compressibility and accelerates the rate of consolidation of soft
saturated clay. During the last four decades, the technique has been utilized worldwide
and proved successful results. Several modifications have been proposed to increase the
efficiency of this technique such as addition of additives, use of special patterns of
reinforcements, encasing the stone columns with geonet or geogrid to provide extra
confinement that enhances the bearing capacity and reduces the settlement drastically
without compromising its effect as a drain.
The present paper focuses on the behavior of soft saturated clay reinforced with
ordinary and geogrid encased stone columns. The investigation was performed both
experimentally through small scale models and through numerical techniques. The
influence of relative density of the back fill material and the presence of the encasement
are the main parameters investigated.
Ordinary stone columns revealed an increase of 20% in the carrying capacity when
the relative density of the backfill stone aggregates increased from 23% to 71%,
furthermore the efficiency of the encasement was more pronounced at lower relative
density.