Behavior of Laterally Loaded Piles under Scour Conditions Considering the Stress History of Undrained Soft Clay

Lin, Cheng; Han, Jie; Bennett, Caroline; Parsons, Robert L.

doi:10.1061/(asce)gt.1943-5606.0001112

Cited by 36 publications

(39 citation statements)

References 5 publications

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“…(9) and (10), another parameter (the effective unit weight) after scour should be determined by Eq. (11) as Lin et al (2014) presented…”

Section: Modified Lateral Subgrade Modulus After Scourmentioning

confidence: 99%

“…In this analytical model, the lateral subgrade modulus that was correlated to the undrained shear strength of soft clay was modified to account for the stress history effect after scour. The procedures of the modification are similar to those presented by Lin et al (2014), while the latter work focused on the scour effect on the behavior of laterally loaded piles in soft clay. In general, the present work has been developed on the basis of the previous studies (Gabr et al 1997;Lin et al 2014) to improve the analyses for bridge pile buckling under different scour conditions.…”

mentioning

confidence: 97%

“…However, the effect of soil stress history after scour was not considered in these studies. In reality, the remaining soils around a foundation after scour event undergo an unloading process (Brown and Castelli 2010;Lin et al 2010Lin et al , 2014. In other words, the overconsolidation ratios (OCRs) of the remaining soils are increased due to scour.…”

mentioning

confidence: 98%

“…In other words, the overconsolidation ratios (OCRs) of the remaining soils are increased due to scour. Moreover, as the OCR is the major factor influencing the ultimate soil resistance of soft clay (Lin et al 2014), the effect of stress history of soft clay on bridge pile buckling under extreme scour conditions should be further examined.…”

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confidence: 99%

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Extreme scour effects on the buckling of bridge piles considering the stress history of soft clay

2015

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Scour is a natural phenomenon caused by the erosion or removal of streambed or bank material from bridge foundations due to flowing water. As the buckling capacity of bridge piles varies inversely with the square of the unsupported pile height, an extreme scour at the pile caused by floodwater could result in a buckling failure of the pile and collapse of the bridge. The common way to analyze the scour-affected buckling stability of bridge piles is to remove the scoured soil layers while possible changes in stress history of the remaining soils are ignored. In reality, however, the remaining soils undergo an unloading process due to scour, and its overconsolidation ratios are increased. In this study, an analytical model with modified lateral subgrade modulus is presented to investigate the extreme scour effect on the buckling of bridge piles in soft clay considering the stress history of the remaining soils. A case study is used to compare the calculated results by considering and ignoring the stress history effect. The results show that ignoring the stress history of the soft clay will overestimate the buckling capacity of bridge pile foundation under scour.

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“…(9) and (10), another parameter (the effective unit weight) after scour should be determined by Eq. (11) as Lin et al (2014) presented…”

Section: Modified Lateral Subgrade Modulus After Scourmentioning

confidence: 99%

mentioning

confidence: 97%

mentioning

confidence: 98%

mentioning

confidence: 99%

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Extreme scour effects on the buckling of bridge piles considering the stress history of soft clay

2015

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“…Although extensive research efforts have been paid on sour effect on pile lateral responses [6][7][8][9], most of these studies have been largely limited to small-diameter piles, with ignorance of the stress history effect under scour conditions. The response of the laterally loaded pile under scouring is usually analyzed by two simplified approaches (I): simply removing the scour layers without changing the strength and stiffness of the remaining soils [7,8], or (II) solely considering the effects of stress history on the soil strength [10][11][12]. The approach (I) ignores the stress history effect due to scouring, which overestimates the undrained shear strength of the remaining soils (as shown in Figure 1), and Figure 1), and thus leads to a non-conservative estimation of monopile response.…”

Section: Introductionmentioning

confidence: 99%

Scour Effects on the Lateral Behavior of a Large-Diameter Monopile in Soft Clay: Role of Stress History

Lai

Wang

et al. 2019

JMSE

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Scouring of soil around large-diameter monopile will alter the stress history, and therefore the stiffness and strength of the soil at shallow depth, with important consequence to the lateral behavior of piles. The existing study is mainly focused on small-diameter piles under scouring, where the soil around a pile is analyzed with two simplified approaches: (I) simply removing the scour layers without changing the strength and stiffness of the remaining soils, or (II) solely considering the effects of stress history on the soil strength. This study aims to investigate and quantify the scour effect on the lateral behavior of monopile, based on an advanced hypoplastic model considering the influence of stress history on both soil stiffness and strength. It is revealed that ignorance about the stress history effect (due to scouring) underestimates the extent of the soil failure wedge around the monopile, while overestimates soil stiffness and strength. As a result, a large-diameter pile (diameter D = 5 m) in soft clay subjected to a souring depth of 0.5 D has experienced reductions in ultimate soil resistance and initial stiffness of the p-y curves by 40% and 26%, and thus an increase of pile head deflection by 49%. Due to the inadequacy to consider the stress history effects revealed above, the existing approach (I) has led to non-conservative estimation, while the approach (II) has resulted in an over-conservative prediction.

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Influence of scour on the vertical response of rock‐socketed piles in layered saturated rock–soil mass

Chen

Guo

et al. 2022

Num Anal Meth Geomechanics

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The influence of scour on the vertical response of rock‐socketed piles in a layered saturated rock–soil mass is studied through the finite element‐boundary element coupling method. By utilizing the theoretical solution of layered saturated media as the kernel function, the boundary element method (BEM) is used to deduce the boundary integral equations of rock–soil mass. Meanwhile, the pile is modelled with the three‐node bar element and the global stiffness matrix of the pile is assembled by the finite element method (FEM). Then according to the scour type, the flexibility matrix of the foundation is recombined and extended, which is consistent with the stiffness matrix dimension of the pile. In consideration of the force balance and continuity conditions at the pile‐soil‐rock interface, the FEM–BEM coupling equation is established to solve the interaction between layered rock–soil mass and rock‐socketed pile that considers different scour types. A corresponding MATLAB program is compiled to verify the correctness of the present theory by comparisons with the existing literature solutions, field tests and the finite element solutions. The influences of the scour type, scour depth, socketed length as well as pile‐rock mass modulus ratio and rock mass stratification on the vertical response of a rock‐socketed single pile are further discussed through several numerical examples.

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Behavior of Laterally Loaded Piles under Scour Conditions Considering the Stress History of Undrained Soft Clay

Cited by 36 publications

References 5 publications

Extreme scour effects on the buckling of bridge piles considering the stress history of soft clay

Extreme scour effects on the buckling of bridge piles considering the stress history of soft clay

Scour Effects on the Lateral Behavior of a Large-Diameter Monopile in Soft Clay: Role of Stress History

Influence of scour on the vertical response of rock‐socketed piles in layered saturated rock–soil mass

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