Adaptation of method of fragments to axisymmetric cofferdam seepage problems

Madanayaka, Thushara Asela, and Sivakugan, Nagaratnam (2017) Adaptation of method of fragments to axisymmetric cofferdam seepage problems. International Journal of Geomechanics, 17 (9). 0601701.

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Abstract

The method of fragments can be used to efficiently obtain solutions to a variety of two-dimensional seepage problems, especially confined flow problems. With this method, the flow domain is divided into fragments that span zones, which are defined between certain critical planes, based on the assumption that the equipotential lines through each such plane are coincident with the plane(s) in question. A dimensionless form factor is then defined for each fragment, and the total flow rate is computed using these form factors in a straightforward manner. An extension of the method of fragments to the axisymmetric cofferdam problem is presented in this paper. A range of numerical simulations was used to generate design charts to obtain the required axisymmetric form factors and exit gradients. These were validated against detailed numerical solutions and against analytical solutions reported in the literature. The design charts presented in this paper are considered to provide very reliable estimates of the seepage conditions and for a wide range of cofferdam geometries of practical interest.

Item ID: 50934
Item Type: Article (Research - C1)
ISSN: 1943-5622
Keywords: method of fragments; circular cofferdam; axisymmetric; flow rate; exit gradient
Date Deposited: 25 Oct 2017 03:09
FoR Codes: 09 ENGINEERING > 0905 Civil Engineering > 090501 Civil Geotechnical Engineering @ 100%
SEO Codes: 87 CONSTRUCTION > 8702 Construction Design > 870201 Civil Construction Design @ 100%
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