Abstract
Experimental model tests were carried out to study the response of skirted foundation resting on dry sand. The experiments were performed in a large soil container (1000 1000 mm in cross section and 800 mm in height). Skirts with three different lengths (L) varied from 0.5D to 1.5D was attached to the edge of shallow circular foundations having three different diameters (D=60, 90 and 120 mm). Different parameters have been studied; these parameters involve skirt length, foundation size and skirt conditions. Skirts with open end and closed end were used. The relative density was kept constant and equals to 60%. The case of foundation without skirt (L=0) was initially tested and set as a reference for comparison purpose. From the results of experimental tests, it was found that the skirt modifies the load-settlement behaviour, increasing the load carrying capacity and reducing the foundation settlement. The results also indicate that load carrying capacity of skirted foundation increases with increase skirt length as well as foundation size. The results show that using skirt with closed end brought a considerable increase in load carrying capacity than that of open end.
Highlights
The poor ground conditions like loose to medium dense sand pose the problem of low bearing capacity and large settlement of foundation resting on it under relatively lesser loads, it became necessary to develop and apply various methods of soil improvement, for example soil reinforcement, deep compaction, grouting ... etc
Twenty one experimental model tests were carried out on isolated circular foundations (60 mm, 90 mm and 120 mm in diameter) with two types of skirts to investigate the behaviour of skirted foundations resting on dry clean sand
Load carrying capacity value is taken as the load corresponding to a limited settlement that equals to 10% of foundation diameter as proposed by Terzaghi (1943)
Summary
The poor ground conditions like loose to medium dense sand pose the problem of low bearing capacity and large settlement of foundation resting on it under relatively lesser loads, it became necessary to develop and apply various methods of soil improvement, for example soil reinforcement, deep compaction, grouting ... etc. The poor ground conditions like loose to medium dense sand pose the problem of low bearing capacity and large settlement of foundation resting on it under relatively lesser loads, it became necessary to develop and apply various methods of soil improvement, for example soil reinforcement, deep compaction, grouting ... Skirted foundation have proven to be competitive alternatives to more traditional foundation solutions like piles in various types of soils due to their economic benefits which lead to cost saving through reduction in materials and in time required for installation. It is utilized as an alternative to deep foundation in soil has low strength at its surface
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