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Numerical modeling of dredging effect on berthing structure

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Abstract

Piles and diaphragm wall-supported berthing structure on marine soils are loaded laterally from horizontal soil movements generated by dredging. The literature on the adequacy of the finite element method modeling of berthing structure to analyze their behavior during dredging is limited. This paper describes a finite element approach for analyzing the lateral response of pile and diaphragm wall during dredging. Piles are represented by equivalent sheet-pile walls and a plane strain analysis using the finite element method is performed. Results from the finite element method are compared with full-scale field test data. Full-scale field test was conducted on a bearing structure to measure the lateral deflection on pile and diaphragm wall for their full length using inclinometer during dredging in sequence. The finite element method results are in good agreement with full-scale field results. Conclusions are drawn regarding application of the analytical method to study the effect of dredging on piles and diaphragm wall-supported berthing structures.

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Abbreviations

c u :

Undrained cohesion (FL−2)

d :

Pile diameter

E s :

Young’s modulus of concrete (FL−2)

E sc :

Young’s modulus of concrete after considering creep (FL−2)

EA :

Axial modulus (F)

E s I s :

Rigidity modulus of soil (FL2)

E p I p :

Rigidity modulus of pile (FL2)

E w I w :

Total rigidity modulus of both soil and pile (FL2)

K o :

Coefficient of earth pressure at rest condition (dimensionless)

N :

Standard penetration test value (dimensionless)

S :

Spacing between piles (L)

t :

Equivalents thickness (L)

φ:

Angle of internal frication (degrees)

φc :

Creep coefficient (dimensionless)

ψ:

Dilatancy angle (degrees)

ν:

Poisson ratio (dimensionless)

γsat :

Saturated unit weight of soil (FL−3)

γsub :

Submerged unit weight of soil (FL−3)

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Authors and Affiliations

  1. Department of Civil Engineering, NIT, Tiruchirappalli, 15, India

    Kasinathan Muthukkumaran

  2. Department of Ocean Engineering, IIT Madras, Chennai, 36, India

    Ranganathan Sundaravadivelu

Authors
  1. Kasinathan Muthukkumaran
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  2. Ranganathan Sundaravadivelu
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Correspondence to Kasinathan Muthukkumaran.

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Muthukkumaran, K., Sundaravadivelu, R. Numerical modeling of dredging effect on berthing structure. Acta Geotech. 2, 249–259 (2007). https://doi.org/10.1007/s11440-007-0040-1

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  • DOI: https://doi.org/10.1007/s11440-007-0040-1

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