RT Journal T1 Soil freezing process and different expressions for the soil-freezing characteristic curve A1 JunPing Ren, Sai K. Vanapalli, Zhong Han PB Sciences in Cold and Arid Regions FD 2017-06-01 YR 2017 JF Sciences in Cold and Arid Regions JO Sciences in Cold and Arid Regions VO 9 IS 3 SP 221 DO 10.3724/SP.J.1226.2017.00221 K1 frozen soil;soil-freezing characteristic curve;Clapeyron equation;soil-water characteristic curve;unfrozen water content LK {http://www.scar.ac.cn/EN/article/article_81.shtml}