Design Charts for Double‐Walled Cofferdams

Banerjee, Sunirmal

doi:10.1061/(asce)0733-9410(1993)119:2(214)

Cited by 10 publications

(5 citation statements)

References 5 publications

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“…The double-wall cofferdam consists of two parallel sets of sheet piles driven into the ground around the excavation, and concrete dams and bridge pier foundations are the common applications (King and Cockroft 1972). In these applications, cofferdam length is much larger than its breadth; therefore, it is reasonable to analyze them as a two-dimensional problems (Banerjee 1993).…”

Section: Application Of Fragment Type Cmentioning

confidence: 99%

Approximate equations for the method of fragment

Madanayaka

Sivakugan

2016

International Journal of Geotechnical Engineering

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The method of fragment is a simple and approximate technique for solving confined seepage flow problems. In this method, the flow domain is divided into few fragments along the equipotential lines that are assumed to be vertical and a dimensionless form factor is defined for each fragment. The flow rate and the exit hydraulic gradient can be computed using the form factors. Griffiths proposed three types of fragments that are adequate to solve most configurations, incorporating anisotropy in permeability, and presented design charts for determining the form factors. In this paper, through extensive numerical modeling simulations, equations are developed for the form factors and they are validated. These equations enable quicker computations and the method of fragment be implemented in spreadsheets.

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Section: Application Of Fragment Type Cmentioning

confidence: 99%

Approximate equations for the method of fragment

Madanayaka

Sivakugan

2016

International Journal of Geotechnical Engineering

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“…Buhan et al [11] used the limit equilibrium design theory to calculate the load limit on a cofferdam, considering the weir core fill and sheet piles on both sides as an elastic continuous medium and shell, while also analyzing the deformation based on different boundary conditions. Banerjee et al [12] analyzed the effect of steady-state seepage on a double-row sheet pile cofferdam structure by adding a seepage safety factor to the theoretical calculations. Lei et al [13] determined that the damage patterns of slopes reinforced by single and double rows of stabilizing piles differ based on the distribution of potential sliding surfaces, bending moments, and thrusts.…”

Section: Introductionmentioning

confidence: 99%

Stability Study of a Double-Row Steel Sheet Pile Cofferdam Structure on Soft Ground

Jiang

Guo

Wang

et al. 2023

Water

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The stability of a double-row steel sheet pile cofferdam structure under soft ground conditions was investigated in this study, using the temporary cofferdam of the Shenzhen–Zhongshan cross-river channel as the engineering background. The stability of the cofferdam design solution was calculated with a model that incorporates factors such as the coordination of independent pile top displacement, as well as the m-value for backfilled sand and the thrown rock body. The internal force and displacement results of the cofferdam under different working conditions are obtained. And the entire construction process was analyzed using the finite element method. The results indicate that the overall stability and overturning stability of the cofferdam satisfy relevant safety requirements, with minimum safety factors of 1.744 and 1.400, respectively. The maximum displacement of the inner and outer steel sheet piles is 34 mm, the maximum bending moment is 249.30 kN·m, and the maximum shear force is 266.66 kN. The displacements of sheet piles were within an acceptable range, and the internal forces remained below the load capacity of the selected sheet pile type for the design. Based on these findings, the cofferdam structure can be considered safe and satisfying the specified requirements. This work may have instructive value for cofferdam design and construction.

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“…The research on water-stop curtains mainly includes two aspects: analytical methods and numerical simulations. Regarding research using analytical methods, Banerjee S et al [11,12] and Bereslavskii [13] deduced the analytical solution for a steady seepage field, based on the theory of fluid dynamics, which was used to study the distribution characteristics of a seepage field. Shen et al [14] derived a series of simple formulas to calculate the head difference between two sides of the stop curtain.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Study on the Distribution Characteristics of Precipitation Seepage Field in Water-Rich Ultra-Thick Sand and Gravel Layer

Li,

Cheng,

Liu

et al. 2023

Water

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The distribution characteristics of a seepage field generated by precipitation affects the deformation damage of the geological body and engineering geological stability, especially a seepage field with a water-rich ultra-thick sand and gravel layer. In order to study the seepage field distribution characteristics of a water-rich ultra-thick sand and gravel layer, taking Luoyang Metro Line 1 as the engineering background, combined with the actual monitoring data of on-site precipitation, numerical simulation was used to study the seepage characteristics of the pit project precipitation with a suspended water-stop curtain. Through the study, the distribution characteristics of the seepage field under different precipitation depths and aquifer thicknesses were obtained, and the changes in pore water pressure characteristics, flow velocity and water inflow, depending on the precipitation depth and aquifer thickness, were analyzed. The research results show that, when comparing the calculated and measured results of the water level drop in the foundation pit, the average value of the error of the water level drop value in the pit and the descending well is 11.7%, which indicates that the calculation model meets the needs for its use in calculation and analysis. Under the conditions of a suspended water-stop curtain and precipitation, for the pore water pressure characteristics, the variation amplitude of the pore water pressure inside the pit increases with the precipitation depth and aquifer thickness. For the maximum flow velocity, all characteristics are present at the bottom of the suspended water-stop curtain, near the inside of the pit. The maximum flow velocity increases linearly with the precipitation depth and there is a threshold when the aquifer thickness is five times the precipitation depth. For water inflow, it increases with the increase in the precipitation depth and aquifer thickness, but, with a continuous increase in the aquifer thickness, the magnitude of water inflow growth decreases.

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Design Charts for Double‐Walled Cofferdams

Cited by 10 publications

References 5 publications

Approximate equations for the method of fragment

Approximate equations for the method of fragment

Stability Study of a Double-Row Steel Sheet Pile Cofferdam Structure on Soft Ground

Numerical Simulation Study on the Distribution Characteristics of Precipitation Seepage Field in Water-Rich Ultra-Thick Sand and Gravel Layer

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