Optimizing the location of contraction–expansion joints in concrete canal lining

Abstract In the present paper, the interaction between subgrade soil and canal lining under different operating conditions has been analysed using finite element models. Analysis was made by determining stress–strain relationships of soil–concrete lining. Based on the results of the analysis, the best location for providing contraction–expansion joints on the lining was determined in a way to minimize the risk of cracking for any operating condition of canals of different sizes. According to the findings, providing a longitudinal joint at the lower 1/3 depth of small to medium size canals would eliminate any possibility of cracking by reducing the bending moment to 1/10 in comparison with a lining having no joint at the same location. To generalize the results, effects of subgrade soil characteristics such as modulus of elasticity and Poisson's ratio on the magnitude of the bending moments and deformations have been investigated. It was proved that the results are valid for all possible soil characteristics. Copyright © 2008 John Wiley & Sons, Ltd.

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