A test method to study scour effects on the lateral response of rigid piles in sand under real scour conditions

Liu, Jinzhong; Chen, Xuguang; Liu, Xixi

doi:10.1016/j.oceaneng.2022.112292

Cited by 8 publications

(7 citation statements)

References 37 publications

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“…The diffusion angle of the curved slip surface is about 18° which is half of the internal friction angle φ of the soil, that is, φ /2. The middle part consists of vertical slip surfaces 21 in the range of the lower part of the wall body, which conforms to the vertical slip failure mechanism of the under‐reamed pile proposed by Majer 27 . The bottom part consists of slip surfaces with vase‐shaped curves around the bottom nodular part, which is attributed to the local compaction of the sand preventing the slip surface from extending around.…”

Section: Testing Results and Analysissupporting

confidence: 66%

“…Based on Equation ( 8), the skin friction τ sd can be obtained. Then, an updated 𝑃 ′ 𝑡𝑑 acting on the top of unit d can be calculated using Equation (21).…”

Section: Iterative Load Transfer Proceduresmentioning

confidence: 99%

“…Based on Equation ( 8), the skin friction τ sz can be obtained. Then, an updated 𝑃 ′ 𝑡𝑧 acting on the top of unit z can be calculated using Equation (21). Step (VIII): According to the solution ideas of steps (iv) and (v), all the unknown components of the non-nodular units above the middle nodular unit z can be continuously solved until the calculation reaches unit 1 at the top of the foundation.…”

Section: Iterative Load Transfer Proceduresmentioning

confidence: 99%

“…During the soil installation process, an appropriate sand preparation method is required to meet the requirements of sand relative density. The sand rain method is a common method for sand preparation, and sand with different relative densities can be obtained by controlling the height of the falling sand 21 . In this test, the sand preparation is based on the sand rain method, and the relative sand density was determined by ring knife sampling with five sampling points for each 5‐cm depth soil layer.…”

Section: Experiments Setupmentioning

confidence: 99%

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Uplift behavior of nodular diaphragm wall: Experiment and theory

Wu,

Zhang,

et al. 2024

Num Anal Meth Geomechanics

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The nodular diaphragm wall (NDW) is a novel foundation that can provide significant uplift load resistance compared to a typical diaphragm wall foundation. With the advantages of low noise, cost‐effectiveness, high work efficiency, and construction abilities close to existing buildings, NDW has excellent engineering application prospects in urbanization construction. However, the scarce knowledge on the uplift resistance, failure mode, and calculation method of the NDW has hindered its application in practice. In this paper, indoor model tests based on particle image velocimetry (PIV) technology are carried out to investigate the uplift behavior of three NDW models with different amounts and locations of nodular parts. The load transfer mechanisms of the three NDW models are discussed in detail, and special attention is given to the failure mode analysis. In addition, a theoretical analysis is implemented based on the load transfer approach. The transfer function and associated critical parameters are discussed in detail. Accordingly, an iterative procedure is proposed to interpret the load transfer information of an uplift NDW in multilayered soils under different loading levels. The findings derived in this paper are helpful to the uplift deformation, capacity calculation, and design of NDW in practical engineering.

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Section: Testing Results and Analysissupporting

confidence: 66%

“…Based on Equation ( 8), the skin friction τ sd can be obtained. Then, an updated 𝑃 ′ 𝑡𝑑 acting on the top of unit d can be calculated using Equation (21).…”

Section: Iterative Load Transfer Proceduresmentioning

confidence: 99%

Section: Iterative Load Transfer Proceduresmentioning

confidence: 99%

Section: Experiments Setupmentioning

confidence: 99%

See 2 more Smart Citations

Uplift behavior of nodular diaphragm wall: Experiment and theory

Wu,

Zhang,

et al. 2024

Num Anal Meth Geomechanics

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“…This approach is practical but may fail to account for the differences in loading height and dynamic characteristics between wind and wave loads. Therefore, some researchers have simplified the wave load as a concentrated cyclic load acting at the height of sea level, and the wind load is regarded as a low-frequency cyclic load or static load acting at the top of the tower [5][6][7]. Nevertheless, these studies did not thoroughly explore the influence of the ratio between the wind and wave load amplitudes on cumulative deformations, which is referred to as the wind-wave load contribution ratio.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on monopile-supported offshore wind turbine subjected to long-term wind and wave cyclic loading

Zheng,

Zhang,

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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Offshore wind energy has recently gained much attention. During its service life, a monopile-supported offshore wind turbine (OWT) is subjected to long-term wind and wave lateral cyclic loads with different cycle characteristics, inducing accumulated deformation of the OWT system to exceed the serviceability limit state and causing safety accidents. In this study, a 1g scaled model test with a similarity ratio of 1:100 was conducted to investigate the lateral response of a monopile-supported OWT in sand under long-term wind and wave cyclic loads. Two sets of centrifugal gear cyclic loading devices applied stable long-term wind and wave cyclic loads and different cyclic load amplitudes and directions were achieved by adjusting the input voltage and counterweight masses. Four groups of long-term cyclic loading tests were conducted for the monopile-supported OWT, considering different wind load simplification methods and various wind-wave load contribution ratios. The lateral displacement and accumulated tilt of the OWT were monitored using two laser displacement transducers installed at different heights. The results show that a simplistic treatment of wind loads as static loads results in an overestimation of the cumulative rotational deformation, and an increase in the wind-wave load contribution ratio decreases the cumulative tilts of the OWT structures.

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