TY - GEN
T1 - Settlement and Capacity of Piles Under Large Number of Cyclic Loads
AU - Chen, Renpeng
AU - Peng, Chunyin
AU - Wang, Jianfu
AU - Wang, Hanlin
N1 - Funding Information:
Acknowledgements Support from the Hunan Provincial Science and Technology Department (Grant No. 2019RS1030) is acknowledged. The authors express their appreciation to professorate senior engineer Zhenghui Jiang from Zhejiang Institute of Communications CO., LTD for providing the testing site. The help with the experiments from Mr. Yong Xu and Dr. Wei Cheng from the Geotechnical Institute of Zhejiang University is also acknowledged.
Funding Information:
Support from theHunan Provincial Science and Technology Department (Grant No. 2019RS1030) is acknowledged. The authors express their appreciation to professorate senior engineer Zhenghui Jiang from Zhejiang Institute of Communications CO., LTD for providing the testing site. The help with the experiments from Mr. Yong Xu and Dr. Wei Cheng from the Geotechnical Institute of Zhejiang University is also acknowledged.
Publisher Copyright:
© 2022, The Author(s), under exclusive license to Springer Nature Switzerland AG.
PY - 2021/9
Y1 - 2021/9
N2 - This study reports a group of field tests on cyclically loaded piles installed in soft clay in Huzhou, China. Two 29.5 m long pipe piles were instrumented with transducers to measure the accumulated settlement at the pile-head, the pore water pressure and total pressure at the pile-soil interface, and axial load at the pile end, respectively. The major objective of the field testing is to gain a better understanding of the evolution of the pile-head settlement and the effective stress at the pile-soil interface. The results of cyclic loading tests under different combinations of static load and cyclic load are discussed with reference to changes in the pile capacity, the permanent settlement, and the radial stresses. It is found that the permanent settlement of piles can be characterized as quickly stabilized (QS), progressively developing (PD), and dramatically failed (DF) patterns. Under low-level loading (QS pattern), the pile-shaft earth pressure is nearly undisturbed, final gains in effective stress are observed due to slight dissipation of pore pressure. For intermediate-level loading (PD pattern), significant reductions in pore pressure, earth pressure, and effective stress are observed after cyclic loading. Regarding high-level loading (DF pattern), the quick accumulation of pore water pressure leads to a slight increase in earth pressure, resulting in a continuous decrease in effective stress.
AB - This study reports a group of field tests on cyclically loaded piles installed in soft clay in Huzhou, China. Two 29.5 m long pipe piles were instrumented with transducers to measure the accumulated settlement at the pile-head, the pore water pressure and total pressure at the pile-soil interface, and axial load at the pile end, respectively. The major objective of the field testing is to gain a better understanding of the evolution of the pile-head settlement and the effective stress at the pile-soil interface. The results of cyclic loading tests under different combinations of static load and cyclic load are discussed with reference to changes in the pile capacity, the permanent settlement, and the radial stresses. It is found that the permanent settlement of piles can be characterized as quickly stabilized (QS), progressively developing (PD), and dramatically failed (DF) patterns. Under low-level loading (QS pattern), the pile-shaft earth pressure is nearly undisturbed, final gains in effective stress are observed due to slight dissipation of pore pressure. For intermediate-level loading (PD pattern), significant reductions in pore pressure, earth pressure, and effective stress are observed after cyclic loading. Regarding high-level loading (DF pattern), the quick accumulation of pore water pressure leads to a slight increase in earth pressure, resulting in a continuous decrease in effective stress.
KW - Cyclic loading
KW - Field testing
KW - Long-term behaviors
KW - Soft clay
UR - http://www.scopus.com/inward/record.url?scp=85116063340&partnerID=8YFLogxK
U2 - 10.1007/978-3-030-77238-3_79
DO - 10.1007/978-3-030-77238-3_79
M3 - Conference article published in proceeding or book
AN - SCOPUS:85116063340
SN - 9783030772376
T3 - Lecture Notes in Civil Engineering
SP - 1049
EP - 1059
BT - Advances in Transportation Geotechnics IV - Proceedings of the 4th International Conference on Transportation Geotechnics Volume 3
A2 - Tutumluer, Erol
A2 - Nazarian, Soheil
A2 - Al-Qadi, Imad
A2 - Qamhia, Issam I. A.
PB - Springer Science and Business Media Deutschland GmbH
T2 - 4th International Conference on Transportation Geotechnics, ICTG 2021
Y2 - 23 May 2021 through 26 May 2021
ER -