Experimental Study on the Vertical Bearing Capacity of Stiffened Deep Cement Mixing Piles
Publication: International Journal of Geomechanics
Volume 22, Issue 5
Abstract
A stiffened deep cement mixing (SDCM) pile is a type of composite pile that has a rigid pile at the core that reinforces the deep cement mixing (DCM) pile. An SDCM pile combines the advantages of both a DCM pile (i.e., high lateral friction resistance) and a rigid pile (i.e., high stiffness and strength). This work presents four sets of laboratory model tests that were aimed at investigating the vertical bearing capacity of SDCM piles with different cement contents by monitoring the pile top load, the axial force, the pile settlement, and the pile end resistance. Two failure modes of the SDCM piles were observed during the tests––pile failure (the pile ruptured at the section below the core pile) and punching failure (the pile penetrated into the underlying soil). It was found that the vertical bearing capacity of the SDCM piles increased with cement content, up to the point of punching failure. The pile end resistance increased with the pile top load. When the ultimate bearing capacities of the SDCM piles were reached in the model tests, the ratio between pile end resistance and pile top load ranged from 19.4% to 54.2%, indicating that pile end resistance cannot be ignored.
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Acknowledgments
These experiments were funded by the National Natural Science Foundation of China (Grant Nos. 52078506 and 51908516), the Applied Basic Research Program of the Shanxi Province of China (201901D211209 and 201901D111133), the Natural Science Research Foundation of North University of China (XJJ201902), and the Guangdong Key Laboratory of Oceanic Civil Engineering Open Fund (LMCE202105).
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Published In
International Journal of Geomechanics
Volume 22 • Issue 5 • May 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Aug 2, 2021
Accepted: Dec 20, 2021
Published online: Mar 2, 2022
Published in print: May 1, 2022
Discussion open until: Aug 2, 2022
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