Ng and Pang (2000) stated that increasing the surcharge causes increasing the air entry value in SWCC, but I think it is reverse because increasing the surcharge will decrease big pores of a soil. What is your point of view?
What is surcharge? you mean compaction? If so, then compaction reduces macroporosity and increases air entry pressure which is related to the (1/a) and not (a) parameter of van genuchten model. The smaller the value of (a) the higher the air entry pressure in the soil. Check these papers
Check the explanation of the terms in Eq.1 of the fulltext1.pdf
Check section 4 of the following paper, that uses similarity between SWCC and SFCC:
Azmatch, T.F., Sego, D.C., Arenson, L.U., and Biggar, K.W., 2012. New Ice Lens Initiation Condition for Frost Heave in Fine-Grained Soils. Cold Regions Science and Technology. 82, 8–13.
Check the following paper as well:
Azmatch, T.F., Arenson, L.U., Sego, D.C., Biggar, K.W., 2012b. Soil freezing characteristic curve of Devon Silt. Published in Proceedings of the David C. Sego Symposium, University of Alberta, Edmonton, Alberta, Canada, April 26–27.
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