Response of flexible monopile in marine clay under cyclic lateral load

Liao, Wei-Cheng; Zhang, Jianjing; Wu, Jinbiao; Yan, Kongming

doi:10.1016/j.oceaneng.2017.10.022

Cited by 46 publications

(17 citation statements)

References 32 publications

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“…It is believed that the negative pressure occurs 10 Advances in Civil Engineering mainly because P4 is located in the opposite direction of the pile movement and a suction situation occurs, which in turn exhibits negative pressure during the test. e phenomenon is similar to that of Liao et al and Bauer et al in the monopile model test in clay [36,41]. e pore water pressure of P5 continued to accumulate with increasing number of cycles, and the increasing trend slightly decreased.…”

Section: E Cumulativesupporting

confidence: 86%

“…In order to obtain the p-y curve, the two steps are involved [36]: (1) according to the measured strain of single pile, the bending moment of single pile is calculated by equation ( 3); (2) p and y are calculated according to equations ( 4) and ( 5), respectively. e two boundary conditions are used for equation ( 5): one boundary condition is the tip of single pile with zero displacement, and another boundary condition is obtained from the displacement measured by using LVDT1 and LVDT2.…”

Section: E Cyclic P-y Curvementioning

confidence: 99%

See 1 more Smart Citation

Experimental Study on Pile‐Soil Interaction Response in Saturated Sand under Long‐Term Horizontal Cyclic Loading

Xing

Duo-yin

Wang

et al. 2021

Advances in Civil Engineering

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To explore the pile-soil interaction response in saturated sand under long-term horizontal cyclic loading, a series of indoor 1 g model tests were carried out with self-made loading equipment. In this paper, the self-made loading system and test program are introduced firstly. Then, the long-term horizontal cyclic loading-induced pile top cumulative displacement, the rotation angle, the mono-pile horizontal cyclic stiffness, the cyclic p-y curve, the pore water pressure, the soil settlement, and cracks around mono-pile are fully studied. Based on the experimental results, the pile-soil interaction response shows a two-stage characteristic with the change in cycle (N), and the short-term effects of horizontal cyclic loading are greater than the long-term effects. In the first 1000 cycles, the cumulative displacement of pile top, the rotation angle of mono-pile, and the pore water pressure could reach more than 90% of the final value. In addition, the cyclic p-y curve obtained by the test is generally smaller than the p-y curve calculated from the API specification, and the soil near the mono-pile will settle with annular cracks under the cyclic loading.

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Section: E Cumulativesupporting

confidence: 86%

Section: E Cyclic P-y Curvementioning

confidence: 99%

Experimental Study on Pile‐Soil Interaction Response in Saturated Sand under Long‐Term Horizontal Cyclic Loading

Xing

Duo-yin

Wang

et al. 2021

Advances in Civil Engineering

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“…In addition, the above studies have been mostly conducted on sand, which may be not suitable for the piles in soft clay. Compared with rigid pile in sand [6,7,10], piles installed in soft clay often behave as flexible soil-pile systems [11], and the accumulation of pore water pressure in soft clay cannot be ignored for it would cause the degradation of soil strength [12].…”

Section: Introductionmentioning

confidence: 99%

A Simplified Method for Analysis of Laterally Loaded Piles considering Cyclic Soil Degradation

Yang

Gao

et al. 2021

Advances in Civil Engineering

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This paper proposes a simplified method to analyze the bearing behavior of pile undergoing cyclic lateral load. Firstly, a modified strain model is proposed by utilizing the Duncan–Chang model to describe the stress-strain behavior of soils in the strain wedge. Then, a cyclic degradation model of soft clay considering the accumulation of plastic strain and pore water pressure is presented based on the cyclic triaxial test. Combining with the modified strain wedge model and degradation model of soil, a simplified method is established for the cyclic laterally loaded pile. The accuracy of the present method is verified by comparing it with existing model tests. The results show that the pile lateral displacement and strain wedge depth increase with the number of cycles and cyclic load amplitude. It is necessary to consider the effect of cumulative pore water pressure during the analysis of cyclic laterally loaded pile embedded in soft clay.

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“…Based on their experimental results, they proposed the p-y curve method, which has been widely accepted by practical engineers. In the past decade, numerous experimental studies for the horizontal loading characteristics of piles in sand have been carried out [ 12 , 13 , 14 ]. In addition to 1g tests, Refs.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Whole Wind Power Structure with Innovative Open-Ended Pile Foundation under Long-Term Horizontal Loading

Liu

Wan

Dai

et al. 2020

Sensors

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The offshore wind energy (OWE) pile foundation is mainly a large diameter open-ended single pile in shallow water, which has to bear long-term horizontal cyclic loads such as wind and waves during OWE project lifetime. Under the complex cyclic loads, the stress and displacement fields of the pile-soil system change continuously, which affects the dynamic characteristics of the pile foundation. Within the service life of the pile foundation, the pile-soil system has irreversible cumulative deformation, which further causes damage to the whole structure. Therefore, it is important to examine the overall dynamic characteristics of wind power foundation under high cycle. In this paper, in the dry sand foundation, taking the Burbo Bank 3.6 MW offshore turbine-foundation structure as the prototype, the horizontal cyclic loading model tests of the wind power pile foundation with the scale of 1:50 were carried out. Considering the factors such as loading frequency and cyclic load ratio, the horizontal dynamic characteristics of the whole OWE pile foundation are studied. The comparison results between the maximum bending moment of pile and the fitting formula are discussed. In conclusion, moment of OWE pile shaft is corresponding to the loading frequency (f = 9 HZ) and loading cycles by fitting formulas. The fatigue damage of the OWE pile does not occurs with low frequencies in high cycles.

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Response of flexible monopile in marine clay under cyclic lateral load

Cited by 46 publications

References 32 publications

Experimental Study on Pile‐Soil Interaction Response in Saturated Sand under Long‐Term Horizontal Cyclic Loading

Experimental Study on Pile‐Soil Interaction Response in Saturated Sand under Long‐Term Horizontal Cyclic Loading

A Simplified Method for Analysis of Laterally Loaded Piles considering Cyclic Soil Degradation

Experimental Study on Whole Wind Power Structure with Innovative Open-Ended Pile Foundation under Long-Term Horizontal Loading

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