SRICOS: Prediction of Scour Rate in Cohesive Soils at Bridge Piers

Briaud, Jean‐Louis; Ting, Francis C. K.; Chen, H. C.; Gudavalli, Rao; Perugu, Suresh; Wei, Gengsheng

doi:10.1061/(asce)1090-0241(1999)125:4(237)

Cited by 285 publications

(135 citation statements)

References 14 publications

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“…The local scour around piles is a major issue because it is one of the key factors that undermine the stability of structures and lead to failure of the piles. For instance, Briaud et al [8] reported that until 1999, approximately 60% of bridge failures in the United States was because of the local scouring around the piles and Hunt [9] documented more than 1502 bridge failure occurred from 1996 to 2005 in the United States. Numerous studies on local scour around circular pile groups have been conducted by laboratory experiments [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Computational Modeling of Flow and Scour around Two Cylinders in Staggered Array

Kim

Roh

Nabi

2017

Water

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This paper presents a numerical study on flow and local scour around two identical cylinders with diverse spacing ratios (s/D) and alignment angles (α). The spacing ratio of center-to-center distance between cylinders (s) to the cylinder diameter (D) varied from 1.25 to 5.0, including five alignment angles ranged from 0 • to 90 • . The detailed scour processes and information were obtained in a physics-based way by using large eddy simulation coupled with sediment transport in a Lagrangian framework and a morphodynamic model. Turbulent flow properties around two cylinders in staggered array are significantly concerned by the spacing ratio and the alignment angle which reflect complex features of evolution of scour and scour depth. The computed results exhibited the scour depth is associated with the spacing ratio and alignment angles especially at the rear cylinder. For small alignment angles, the growth rate at the rear cylinder increased as the spacing ratio increased, due to a decrease in shielding effect. As the alignment angle increased, the scour depth around the rear cylinder increased until the angle reached approximately 45 • -60 • . Subsequently, the scour depth decreased with the alignment angle. It also revealed that the spacing ratio was more sensitive to the maximum scour than that of the alignment angle. For (s-D)/D > 2.0, the maximum scour depth only depended on the spacing ratio.

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Section: Introductionmentioning

confidence: 99%

Computational Modeling of Flow and Scour around Two Cylinders in Staggered Array

Kim

Roh

Nabi

2017

Water

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“…The diameter (B), the height (D) and the mass density of caisson are 10m, 12.5m, 2700kg/m 3 respectively. Beneath the caisson there is a 3 × 3 pile group, whose diameter, length, spacing, Poisson's ratio and Young's modulus of pile are 1m,25m, 2.5m, 0.3 and 2.06×10 5 MPa respectively. The void ratio, mass density, friction angle and Poisson's ratio of soil are 0.65, 1600kg/m 3 , 28° and 0.3 respectively.…”

Section: Comparison Against 3d Finite Element Simulationmentioning

confidence: 99%

“…Other researchers concentrated on the scour depth analysis and scour pattern around foundations. Richardson (1993) and Briaud et al (1999) proposed methods to predict the scour depth around a bridge pier in cohesive and cohesionless soils, respectively. Ataie-Ashtiani and Beheshti (2006) carried out an experimental study on pile groups and derived a correction factor to predict the maximum local scour depth for the pile groups.…”

Section: Introductionmentioning

confidence: 99%

Scour effects on the dynamic lateral response of composite caisson-piles foundations considering stress history of sand

Huang

Zhong

2015

JGS Special Publication

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Scour effect have a significant impact on the dynamic lateral response of composite caisson-piles foundations (CCPFs) because of the removal of soils around the foundation and the change of stress history of remaining soil. Based on the simplified method with the dynamic Winkler model, a computational method for predicting the dynamic impedance of CCPFs influenced by scour is developed. Subsequently, theoretical results for the response of CCPFs are verified by the 3D finite element method with sponge boundary. Finally, results from a case study show that scour has a great influence on the dynamic stiffness and damping coefficient, and the deeper scour depth increases, the more remarkable influence on the results. Besides the removal of soil around CCPFs resulting from scour effect, it also shows that the change of stress history will further weaken the bearing capacity of composite foundation and enlarge the dynamic response. Thus, ignoring the change of stress history would result in an overestimate of the dynamic impedance. And stress history is also proved to be of great significance to increase the resonant response of composite foundation, while has little influence on the resonant frequency.

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“…The erodibility factor is estimated using the submerged jet test for exposed soil areas after Hanson (1990Hanson ( , 1991 and Allen et al (1997) or flumes, as in Briaud et al (1999) or Wynn & Mostaghimi (2006), for vegetated channels. Soil detachment from the channel perimeter is primarily a function of shear stress induced by the flow.…”

Section: Channel Erodibility Factormentioning

confidence: 99%

Prediction of channel degradation rates in urbanizing watersheds

Allen

Arnold

Skipwith

2008

Hydrological Sciences Journal

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In urbanizing watersheds, as land use changes, and storm sewers and impervious surfaces are increased, both the frequency and magnitude of discharge increase, resulting in stream channel down-cutting and widening and related loss of structures and engineering works. A simple model for assessing the time rate of degradation in watersheds is given. The model relies on a continuous simulation of watershed discharge based on local climate (SWAT-DEG) instead of a dominant discharge approach. Unique to this approach is the use of in situ erosion parameters derived from submerged jet tests, which give both the allowable tractive force as well as erodibility coefficients. The model is used in concert with the WatsonHarvey analysis of channel evolution. Four methods were used to verify and validate the model for estimating rates of degradation. A case study of channel stability assessment using this tool was made in north central Texas (USA). Rates of incision were nonlinear and ranged from 0-76 mm/year.

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SRICOS: Prediction of Scour Rate in Cohesive Soils at Bridge Piers

Cited by 285 publications

References 14 publications

Computational Modeling of Flow and Scour around Two Cylinders in Staggered Array

Computational Modeling of Flow and Scour around Two Cylinders in Staggered Array

Scour effects on the dynamic lateral response of composite caisson-piles foundations considering stress history of sand

Prediction of channel degradation rates in urbanizing watersheds

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