Effect of perforations on the bearing capacity of shallow foundation on clay

Run Liu, Meng Meng Liu, Ying Hui Tian, Xinli Wu

Research output: Contribution to journalArticle

Abstract

As a type of shallow foundation, a mudmat serves as the seabed support structure for subsea wells, pipeline manifolds, and pipeline terminations. The shallow foundations are usually designed with perforations to facilitate installation and removal, but the influence of these perforations has not been fully understood. This paper presents a method to analyze the bearing capacities of both two-dimensional (2D) and three-dimensional (3D) perforated shallow foundations using finite element analysis. The soil was idealized as a Tresca material, with the undrained strength increasing linearly with depth. The outcome indicates that perforations have nonnegligible effects on the bearing capacity of shallow foundations. The bearing capacity decreases with increasing perforation ratio, R, and the degree of reduction increases with the increase of the dimensionless ratio kB/Suo, where k is the shear strength gradient, B is the width of the foundation, and Suo is the shear strength at the mudline. For 2D shallow foundations, there exists a critical perforation ratio, Rc; when the perforation ratio is lower than the critical perforation ratio, the perforated foundation does not lose its bearing capacity. For 3D shallow foundations, the bearing capacity decreases directly with the increase of perforation ratio, R.

Original languageEnglish (US)
Pages (from-to)746-752
Number of pages7
JournalCanadian Geotechnical Journal
Volume56
Issue number5
DOIs
StatePublished - Jan 1 2019

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Bearing capacity
Clay
Shear strength
Pipelines
Soils
Finite element method

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering

Cite this

Liu, Run ; Liu, Meng Meng ; Tian, Ying Hui ; Wu, Xinli. / Effect of perforations on the bearing capacity of shallow foundation on clay. In: Canadian Geotechnical Journal. 2019 ; Vol. 56, No. 5. pp. 746-752.
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Effect of perforations on the bearing capacity of shallow foundation on clay. / Liu, Run; Liu, Meng Meng; Tian, Ying Hui; Wu, Xinli.

In: Canadian Geotechnical Journal, Vol. 56, No. 5, 01.01.2019, p. 746-752.

Research output: Contribution to journalArticle

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