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Mathematical Problems in Engineering
Volume 2017, Article ID 2768952, 7 pages
https://doi.org/10.1155/2017/2768952
Research Article

Segmental Modification of the Mualem Model by Remolded Loess

1Department of Airport Engineering and Architecture, Air Force Engineering University, Xi’an 710038, China
2School of Economics and Management, Chang’an University, Xi’an, Shaanxi 710064, China

Correspondence should be addressed to Le-fan Wang; moc.qq@770378923

Received 1 November 2016; Accepted 26 December 2016; Published 15 January 2017

Academic Editor: Konstantinos Karamanos

Copyright © 2017 Le-fan Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The measured diffusion coefficient and soil-water characteristic curve (SWCC) of remolded loess were used to modify the Mualem model for increasing its accuracy. The obtained results show that the goodness of fit between the Mualem model and the variable parameter-modified Mualem method comparing with the test results was not high. The saturation of 0.65 was introduced as the boundary to divide the curve of the measured diffusion coefficient into two segments. When the segmentation method combined with the variable parameter method was used to modify the Mualem model, the fitting correlation coefficient was increased to 0.921–0.998. The modified parameters and corresponding to remolded loess were calculated for different dry densities. Based on the exponential function between and dry density and the linear relation between and dry density, the segmentally modified Mualem model was established for remolded loess by considering variation in dry density. The results of the study can be used for directly determining the unsaturated infiltration coefficient and for indirectly determining the SWCC through diffusion coefficient.