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|Title||Soil Pressure Behind Retaining Wall with Narrow Backfill|
High traffic demands have led to widening of existing highways to accommodate increased traffic volume. However, due to the high cost of widening the roads and limited space available at the site, construction of earth retaining walls is often done under a constrained space. This leads to retaining walls with narrow backfill. This type of walls is referred as “Narrow” retaining walls. Various studies suggest the mechanics of narrow retaining walls differs from traditional walls and the lateral earth pressures in narrow retaining walls are no longer properly predicated by using conventional at-rest or active equations. This research presents the study of retaining wall in case of narrow backfill. Both of theoretical study and experimental work were conducted to calculate the effect of soil pressure at different backfill width ratios. Theoretical study was carried out using numerical analysis (plaxis software program). Different cases were simulated at different aspect ratio (w/H) ranging between 0.2 to 1.4 by 0.2 increment. In addition, the experimental work was performed to verify the obtained results by numerical modeling. The experimental work was conducted using a centrifugal model and Geo-kon device was employed to measure the soil pressure. The results indicated that, due to boundary constraint, the earth pressure decreases as the decrease of the wall aspect ratio also, the results show that lateral earth pressure coefficient considerably becomes constant at aspect ratio of 0.6 and less than rankine earth pressure coefficient at active condition. This implies that earth pressure theories would overestimate the earth pressures and the design based on the values of conventional earth pressure is somewhat overly conservative and uneconomical when applying to the design of narrow walls. Accordingly, different charts were developed due to experimental work and theoretical study to calculate the lateral earth pressure for narrow backfill.
|Publisher||the islamic university|
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