Effect of Groundwater Seepage on Uplift Resistance of Buried Pipelines

Chakraborty, Debarghya and Kumar, Jyant (2014) Effect of Groundwater Seepage on Uplift Resistance of Buried Pipelines. In: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES INDIA SECTION A-PHYSICAL SCIENCES, 84 (4). pp. 595-605.

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Abstract

The uplift resistance of pipelines buried in sands, in the presence of inclined groundwater flow, considering both upward and downward flow directions, has been determined by using the lower bound finite elements limit analysis in conjunction with nonlinear optimization. A correction factor (f (gamma) ), which needs to be multiplied with the uplift factor (F (gamma) ), has been computed to account for groundwater seepage. The variation of f (gamma) has been obtained as a function of i(gamma (w) /gamma (sub) ) for different horizontal inclinations (theta) of groundwater flow; where i = absolute magnitude of hydraulic gradient along the direction of flow, gamma (w) is the unit weight of water and gamma (sub) is the submerged unit weight of soil mass. For a given magnitude of i, there exists a certain critical value of theta for which the magnitude of f (gamma) becomes the minimum. An example has also been presented to illustrate the application of the results obtained for designing pipelines in presence of groundwater seepage.

Item Type:	Journal Article
Publication:	PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES INDIA SECTION A-PHYSICAL SCIENCES
Publisher:	NATL ACAD SCIENCES INDIA
Additional Information:	Copyright for this article belongs to the NATL ACAD SCIENCES INDIA, 5 LAJPATRAI RD, ALLAHABAD 211002, INDIA
Keywords:	Limit analysis; Optimization; Pipelines; Plasticity; Seepage; Uplift resistance
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	20 Dec 2014 04:03
Last Modified:	20 Dec 2014 04:03
URI:	http://eprints.iisc.ac.in/id/eprint/50463

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