Study of water flow drainage in sandy soil due to surface recharge conditions using a laboratory model

Document Type : Research Article

Authors

1 Assistant Professor, PhD in Geotechnical Engineering, Faculty of Engineering, Yasouj University, Yasouj, Iran.

2 M.Sc in Geotechnical Engineering, Faculty of Engineering, Yasouj University, Yasouj, Iran

3 Associate Professor, Department of Soil Science, Faculty of Agriculture, Yasouj University, Yasouj, Iran

Abstract

In the present study, laboratory methods were used to investigate the drainage conditions of the steady-state with the surface recharging. In the study, fine and coarse sandy soil samples were used to study changes in groundwater level. The test specimen was poured into a large-scale flume, with 5.4 m long, which led to uniform vertical precipitation and vertical drains on both sides. The parameters of precipitation rate, soil gradation and water level within the drains were investigated as variables in this study. The results showed that the maximum change in water height in coarse sand due to increasing water height in drains from 0 to 40 cm is equal to 56.9 cm and 72.5 cm, respectively, which caused an increase of 15.6 cm. However, in fine sand, these changes are very small (2 cm) and equal to 87.2 cm in free drainage conditions and 89.2 cm in the conditions of 40 cm of water height inside the drains. The obtained laboratory results were compared with the Dupuit-Forchheimer analytical relationship. It was concluded that this relationship is able to accurately predict the level of water in the fine sand, but in coarse sand, the relationship underestimates the water table height in the soil.

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References

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Amirkabir Journal of Civil Engineering
Volume 53, Issue 10
January 2022
Pages 4219-4230

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