The Influence of Model Parameters of Soil-Water Characteristic Curve to the Seepage
- 10.2991/iccahe-16.2016.139How to use a DOI?
- Soil-Water Characteristic Curve; parameter effects; seepage; hydraulic conductivity; sensitivity analysis; suction value; permeability testing
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.
- © 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/).
Cite this article
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 -