PERFORMANCE OF A GEOGRID-REINFORCED AND PILE SUPPORTED HIGHWAY EMBANKMENT OVER SOFT CLAY
ANTOINE EDMOND ALBERT;
Abstract
Embankments construction projects on soft soil often gives rise to serious problems. In such conditions, a method of ground improvement is generally required to provide adequate soil-bearing capacity and tolerable post-construction total and differential settlements. Piles and Geogrid, are one of the ground improvement techniques exhibiting successful use in stabilizing soft clay soil.
This study numerically investigated the performance of a monitored earth embankment that was constructed on a very soft to soft clay formation stabilized by Piles and Geogrids.
The ratio between S/d “where: S is the spacing between piles and d is the pile diameter” and settlement varies with the different variables used in the parametric study as follows:
- By fixing the pile spacing and the number of geogrids, and by decreasing the pile diameter, the settlement increases by the following percentages: Using a fixed pile spacing of 3m, the settlement increased approximately 15% by decreasing the S/d by 50%.
Using a fixed pile spacing of 6m, by increasing the S/d by 33% the settlement increased by 4.8%, and by increasing the S/d by 50% the settlement increased by 10%.
- For a fixed diameter of 1.00 m, by increasing the S/d by 33%, the settlement increased by 22% and by increasing the S/d by 50% the settlement increased by 60%. For a fixed diameter of 0.50 m, by decreasing the pile spacing from 3.00 m “S/d =6” to 2.00 m “S/d = 4”, the settlement decreased by 18%.
The huge increase of the settlement by this percentage shows the great effect of changing the pile spacing.
- Using multi-geogrid layers does not have any noticed effect on the vertical settlement, and that proves the main role of geogrids reinforcement as per table (1) which is controlling the horizontal movement and distributes the stresses under the embankment area.
GEOGRIDS stabilize soil mass. Creates a composite soil mass of increased strength, it is to soil what reinforcing steel is to concrete.
This study numerically investigated the performance of a monitored earth embankment that was constructed on a very soft to soft clay formation stabilized by Piles and Geogrids.
The ratio between S/d “where: S is the spacing between piles and d is the pile diameter” and settlement varies with the different variables used in the parametric study as follows:
- By fixing the pile spacing and the number of geogrids, and by decreasing the pile diameter, the settlement increases by the following percentages: Using a fixed pile spacing of 3m, the settlement increased approximately 15% by decreasing the S/d by 50%.
Using a fixed pile spacing of 6m, by increasing the S/d by 33% the settlement increased by 4.8%, and by increasing the S/d by 50% the settlement increased by 10%.
- For a fixed diameter of 1.00 m, by increasing the S/d by 33%, the settlement increased by 22% and by increasing the S/d by 50% the settlement increased by 60%. For a fixed diameter of 0.50 m, by decreasing the pile spacing from 3.00 m “S/d =6” to 2.00 m “S/d = 4”, the settlement decreased by 18%.
The huge increase of the settlement by this percentage shows the great effect of changing the pile spacing.
- Using multi-geogrid layers does not have any noticed effect on the vertical settlement, and that proves the main role of geogrids reinforcement as per table (1) which is controlling the horizontal movement and distributes the stresses under the embankment area.
GEOGRIDS stabilize soil mass. Creates a composite soil mass of increased strength, it is to soil what reinforcing steel is to concrete.
Other data
| Title | PERFORMANCE OF A GEOGRID-REINFORCED AND PILE SUPPORTED HIGHWAY EMBANKMENT OVER SOFT CLAY | Other Titles | أداء شبكات التدعيم و الخوازيق فى دعم الجسور الترابية المنشأة على التربة الطينية اللينة | Authors | ANTOINE EDMOND ALBERT | Issue Date | 2015 |
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