The Influence of Model Parameters of Soil-Water Characteristic Curve to the Seepage

DOI

10.2991/iccahe-16.2016.139How to use a DOI?

Keywords

Soil-Water Characteristic Curve; parameter effects; seepage; hydraulic conductivity; sensitivity analysis; suction value; permeability testing

Abstract

The model parameters of Soil-Water Characteristic Curve and the hydraulic conductivity may be obtained by the method of the back analysis according to the permeability test data. In order to raise the efficiency of the back analysis calculation, it is necessary to study the influence of the parameters of SWCC model to the seepage. The matrix suctions of Q2 loess were measured by the indoor test of the pressure plate extractor, and SWCC of Q2 loess was fitted with the Van Ge-nuchten's three-parameter model. The influences of SWCC model parameters a, n, s, r and Ksat on the range of seepage was studied. The results show that the air-entry value of Q2 loess is 18.48kPa, the saturated volumetric water content is 45.82% and the residual volumetric water con-tent is 3.91%. It is found that the permeability sensitivity is different to different parameters. The influence of SWCC model parameters to the seepage depth from the big to the small is Ksat , s, n, a and r , and that to the thickness of the unsaturated infiltration from the big to the small is Ksat, n, s, a and r. The seepage range is the most sensitive with the change of Ksat, and there is the least sensitive with the change of r. The influence of r is evidently lower than that of other parameters. The seepage range increases with the increase of parameters "a" and Ksat; while the seepage range reduces as parameters n and s are added. Suggest that step size of the parameter is determined ac-cording to its influence degree to the seepage in the process of the back analysis of SWCC model parameters.

Copyright

© 2016, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Yan Liang
AU  - Liang Zhang
AU  - Xin Du
AU  - Changmeng Cheng
AU  - Chao Xie
AU  - Tonglu Li
PY  - 2016/10
DA  - 2016/10
TI  - The Influence of Model Parameters of Soil-Water Characteristic Curve to the Seepage
BT  - Proceedings of the 2016 5th International Conference on Civil, Architectural and Hydraulic Engineering (ICCAHE 2016)
PB  - Atlantis Press
SP  - 891
EP  - 898
SN  - 2352-5401
UR  - https://doi.org/10.2991/iccahe-16.2016.139
DO  - 10.2991/iccahe-16.2016.139
ID  - Liang2016/10
ER  -