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Field tests of rock-socketed monopile in coastal area subjected to lateral cyclic loading
Abstract Field tests were carried out to study the lateral cyclic loading characteristics of rock-socketed monopile in coastal area, and the variation law of pile body accumulative displacement, unloading stiffness, and pile body bending moment with the cyclic number and cyclic loading amplitude were obtained by actual measurement. Test results show that the cyclic loading history with sa small amplitude has a certain effect on the cyclic accumulative displacement and the degradation of unloading stiffness, and both the peak bending moment and locking moment of the pile body increase with the increase of cyclic numbers. By using the normalization method and formula fitting method, it is found that, the accumulative rate of cyclic displacement, the degradation rate of unloading stiffness, and the variation rate of peak bending moment of single piles in weathered rock layers are significantly smaller than those of sand foundation or clay foundation. The cyclic p-y curves at different depths are derived, and the different hysteretic characteristics between shallow cyclic p-y curve and deep cyclic p-y curve are explored. Finally, the static load test after cyclic tests was carried out, and it was found that the lateral bearing performance of the rock-socketed monopile was greatly degraded after a total of 3000 times of lateral cyclic loading.
Highlights The traditional p-y curve is not suitable for weathered rocks. Field tests using shape sensor and FBG sensors was conducted to study the cyclic loading response of rock socketed monopile. The effect of cyclic load amplitude and history on the cyclic loading response of rock socketed monopile is investigated. The cyclic p-y curves of rock socketed pile are derived, providing useful insights into the pile-rock dynamic interaction.
Field tests of rock-socketed monopile in coastal area subjected to lateral cyclic loading
Abstract Field tests were carried out to study the lateral cyclic loading characteristics of rock-socketed monopile in coastal area, and the variation law of pile body accumulative displacement, unloading stiffness, and pile body bending moment with the cyclic number and cyclic loading amplitude were obtained by actual measurement. Test results show that the cyclic loading history with sa small amplitude has a certain effect on the cyclic accumulative displacement and the degradation of unloading stiffness, and both the peak bending moment and locking moment of the pile body increase with the increase of cyclic numbers. By using the normalization method and formula fitting method, it is found that, the accumulative rate of cyclic displacement, the degradation rate of unloading stiffness, and the variation rate of peak bending moment of single piles in weathered rock layers are significantly smaller than those of sand foundation or clay foundation. The cyclic p-y curves at different depths are derived, and the different hysteretic characteristics between shallow cyclic p-y curve and deep cyclic p-y curve are explored. Finally, the static load test after cyclic tests was carried out, and it was found that the lateral bearing performance of the rock-socketed monopile was greatly degraded after a total of 3000 times of lateral cyclic loading.
Highlights The traditional p-y curve is not suitable for weathered rocks. Field tests using shape sensor and FBG sensors was conducted to study the cyclic loading response of rock socketed monopile. The effect of cyclic load amplitude and history on the cyclic loading response of rock socketed monopile is investigated. The cyclic p-y curves of rock socketed pile are derived, providing useful insights into the pile-rock dynamic interaction.
Field tests of rock-socketed monopile in coastal area subjected to lateral cyclic loading
Feng, Lingyun (author) / Lv, Wei (author) / Chen, Shuiyue (author) / Liu, Junwei (author)
2022-10-21
Article (Journal)
Electronic Resource
English
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