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Published in:
2021 | OriginalPaper | Chapter
Influence of Size and Depth on Load Capacities of Shallow Foundations Under Limiting Settlement Criteria
Authors : Sanjana Sajeev, Tanisha Shetty, Mir Basith Ali, Ramesh Vandanapu, Vidya Mohanan
Published in: Advances in Geotechnics and Structural Engineering
Publisher: Springer Singapore
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Abstract
Structural engineers always look for options in selecting the foundation sizes for buildings. For a project in Abu Dhabi (United Arab Emirates), where very weak clayey sand layer (average SPT N-value of 4) was encountered between 6.0 and 8.0 m depth below ground, it was required to ensure that stress influence zone shall limit within 6.0 m. Alternatively, it was required to estimate the load due to the influence of weak layer with the limiting settlement of 12 mm as per local guidelines. Bearing capacity, settlement and depth of influence zone were calculated for isolated square footings of four sizes using Geo5 software. One of the main objectives was to understand the influence of the weak layer from different scenarios. It was found that that as the size of footing increases, the depth of footing at which the depth of influence zone crosses the weak layer decreases. Settlements were found to increase at a closer proximity of the very weak layer.