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Title: Investigating Bearing Capacity and Settlement of Shallow Strip Footing on Sand Overlaying Soft Thick Clay
Authors: Fay A. AlTamimi 
Supervisor: Dr. Waleed Abdullah
Degree Awarded: M.Sc in Civil Engineering
Keywords: analytical approach; bearing capacity; failure mode; numerical analysis; settlement; soft clay.
Issue Date: 2019
Publisher:  Kuwait university - college of graduate studies
Abstract: Durability of structures is significantly influenced by the stability of the foundation soils. Soft clay, with its low shear strength and high compressibility characteristics may lead to shear failures and large consolidation settlements under loading. Due to these problems, expensive and extensive improvement of the clayey soil foundation has been applied for huge infrastructure projects in Boubyan Island. However, for limited loadings of residential structures, alternative and inexpensive ground improvement was needed, to enhance the performance of the soft clay foundation soils. This research aims for investigating the performance of the soft clay foundation soils in Boubyan Island under typical residential loadings. Attention was directed towards increasing the bearing capacity, and reducing the amount of settlement in a short period of time. Sand fill material overlaying the soft clay layer was proposed to enhance the performance of the soft clay. The research is aimed at investigating changes in the failure mode as well as the bearing capacity and settlement thorough the application of variable sand cover thicknesses (between 1 to 11 m), foundation loading (100 ton) and foundation size (strip foundation with widths of 1, 2, and 3 m). Some data were collected from Boubyan Seaport Project MPW (2009) and the other by Das (2007). Analysis was performed by applying analytical and numerical models. Short and long term analysis of bearing capacity and settlement were analyzed. Results of both analyses showed that the addition of the sand fill could significantly improve the bearing capacity of the strip footing. It was noticed that as the thickness ratio H/B increases, the ultimate bearing capacity increases till it reaches limiting values at (H/B)critical, where the value of (H/B)critical was varied depending on footing width B. On the other hand, as the ratio H/B increased, an improvement in consolidation time and consolidation settlement was recognized. Modes of failure for both un-drained and drained behavior were also introduced in graphs to illustrate the alteration of the failure zones using different values of H/B.
Appears in Programs:0620 Civil Engineering

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