Experimental Study of Solutions to Reduce the Effect of Soil Swelling on Concrete Lining of Conveyance Canals

Document Type : Research Article

Authors

1 Department of Civil Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran.

2 Geotechnical Group, Faculty of Civil Engineering, University of Tabriz, Tabriz, Iran

Abstract

Damage to canal concrete lining is one of the common problems in irrigation and drainage network projects. Results of several studies show that swelling of unsaturated expansive soils usually led to these damages. In a recent paper, this phenomenon is studied by physical modeling. In this paper, two different ways are studied to control and reduce the effect of swelling soil on canal lining. The first way is the optimization of the number and location of joints on canal lining and the second is the investigation of the effect of canal wall slope on soil-lining interaction behavior. For this purpose, the irrigation and drainage network of the Tabriz plain canal that is under construction on expansive soil is selected as a reference for the geometric properties of the canal section. The physical models are constructed on a small scale (1/10) in the laboratory and two techniques are used in tests: the PIV method and instrumentation. By using of PIV method displacement vectors, volumetric contours, and the magnitude of them in bed soil are obtained and drawn. In addition, the results of physical modelings show the effect of joints to control and distribute of expansive soil-canal lining interaction forces. In the other hand the strain gauges recorded data show that the relative displacement of panels and destructive bending moments of lining are decreased by considering joints on location of maximum internal forces in the canal section. Also it is inferred that the variation of canal wall slope is not an effective way to reduce the lining damages.

Keywords

Main Subjects

References

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Amirkabir Journal of Civil Engineering
Volume 53, Issue 1
April 2021
Pages 149-170

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