University of Khartoum

The Effect of Compacted Fill Layers on Soil Bearing Capacity

The Effect of Compacted Fill Layers on Soil Bearing Capacity

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Title: The Effect of Compacted Fill Layers on Soil Bearing Capacity
Author: Ali, Elsadig Yahia
Abstract: This research was investigated and evaluated the influence of compacted layers of soil on bearing capacity by using plate load test. A sample brought from HATTAB source was tested and its engineering properties were measured. It was classified as low plastic, clayey gravel with CBR 16%. The Bearing capacity and the settlement are main criteria for designing the foundation of a structure. A trench was prepared and filled with the selected sample in four layers. A Plate load test was carried out on each layer. A Sand cone test was also done for each layer to determine the field density value. The analysis of the results obtained from the experimental program showed that, the settlement of layer No 1 was 69.2 mm then decreased to 40.5 mm, 33 mm, 25.8 mm at layer No 2, layer No 3, and layer No 4 respectively. The bearing capacity of layer No 1 was (1090 kN/m²) then increased at layer No 2 (1117 kN/m²) and at layer No 3 (1199 kN/m²) and remained constant at layer No 4 (1199 kN/m²). Different settlements were observed beneath layer No 3 and layer No 4 in spite of equal collapse loads at both. The reason is due to the difference in degrees of compaction through the mass of each layer 94% and 96% respectively. Finally, significant increment in bearing capacity can be achieved by adding more compacted layers, but it was observed when adding layer No 4 bearing capacity increment was almost negligible, accordingly the process of adding a fifth layer will not be economically accepted.
URI: http://khartoumspace.uofk.edu/123456789/25544


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