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An Experimental Investigation on the Uplift and Oblique Pullout Capacity of Belled Piles in Sand

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Abstract

In the present paper an attempt is made to evaluate the axial pullout and oblique pullout capacity of hollow aluminum belled piles embedded in sand. A series of model tests were conducted on a model piles with different length of piles of 240 mm, 360 mm and 480 mm respectively and length of the pile to diameter of pile (L/D) ratios employed are 5, 7.5 and 10 respectively. A pile of shaft diameter 48 mm is used and the ratio of diameter of bell to diameter of shaft (Db/Ds) is varied as 1.5 and 2 respectively. The bell angle is varied as 30°, 45oand 60° respectively. It is further extended to study the influence of oblique pull out capacity by varying the inclination angle as 0°, 30°, and 45° with vertical axis of the piles. The present experimental investigation is conducted in a model box of size equal to 1.2 m × 0.75 m × 1.5 m. All the model tests are conducted at a relative density of 60% corresponding to medium dense state of sand. It is found that as L/D ratio, Db/Ds ratio and bell angle increases, the uplift capacity was found to increase. Also as the oblique angle increases the pullout capacity was found to decrease in belled pile and in case of monopile the pullout capacity was found to increase. The percentage of vertical and horizontal movement reported was found to vary between 1to8% of length of pile and 2 to 50% of diameter of the pile respectively.

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The authors declare that no funds, grants, or other support were received during the preparation of this manuscript.

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Authors and Affiliations

  1. Civil Engineering Department, UVCE, Bangalore, Karnataka, India

    K. V. S. B. Raju,  Kiran & Pavankumar Savadatti

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  1. K. V. S. B. Raju
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  2. Kiran
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  3. Pavankumar Savadatti
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Contributions

All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Dr. K V S B Raju, Kiran and Pawankumar Savadatti. The first draft of the manuscript was written by all the authors and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Kiran.

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Raju, K.V.S.B., Kiran & Savadatti, P. An Experimental Investigation on the Uplift and Oblique Pullout Capacity of Belled Piles in Sand. Geotech Geol Eng 41, 2451–2465 (2023). https://doi.org/10.1007/s10706-023-02408-6

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