Prediction of loess soil-water characteristic curve by mercury intrusion porosimetry
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http://jms.imde.ac.cn https://doi.org/10.1007/s11629-019-5929-2
Prediction of loess soil-water characteristic curve by mercury intrusion porosimetry
LI Hua1
https://orcid.org/0000-0002-7468-6573; e-mail: [email protected]
LI Tong-lu1,2* LI Ping1,2
https://orcid.org/0000-0001-6561-1871;
e-mail: [email protected]
https://orcid.org/0000-0002-6010-961X; e-mail: [email protected]
ZHANG Ya-guo2,3
https://orcid.org/0000-0002-9739-715X; e-mail: [email protected]
*Corresponding author 1 Department of Geological Engineering, Chang’an University, Xi’an 710054, China 2 Observation and Research Station for the Chinese Loess Plateau, Ministry of Education, Zhengning 745399, China 3 Department of Civil Engineering, Chang’an University, Xi’an 710054, China Citation: Li H, Li TL, Li P, Zhang YG (2020) Prediction of loess soil-water characteristic curve by mercury intrusion porosimetry. Journal of Mountain Science 17. https://doi.org/10.1007/s11629-019-5929-2
© Science Press, Institute of Mountain Hazards and Environment, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract: Mercury intrusion porosimetry (MIP) is a simple and fast way to obtain the pore distribution of soil and can be used to estimate the soil-water characteristic curve (SWCC). In previous studies, soil was assumed to be a perfect wettability material, and the contact angle (CA) of the soil-water interface was taken as zero in the SWCC prediction method. However, the CA has proved to be much greater than zero even for hydrophilic soils according to some soil wettability experiments, and it has a significant effect on predicting the SWCC. In this research, a method for predicting the SWCC by MIP, which takes the CA as a fitting coefficient, is proposed. The pore size distribution curves are measured by MIP, and the SWCCs of two loess soils are measured by pressure plate and filter paper tests. When the CA is taken as 70° and 50° for the wetting and drying process, respectively, the SWCCs predicted by the pore size distribution curves agree well with the measured SWCCs. The predicted suction range of the proposed method is 0-105 kPa. The consistency of the results suggests that utilizing the MIP test to predict the SWCC with a proper CA is effective for loess. Received: 03-Dec-2019 Revised: 04-Feb-2020 Accepted: 18-Jun-2020
Keywords: Soil-water characteristic curve; Mercury intrusion porosimetry; Contact angle; Loess
Notation Symbol Explanation CA Contact angle CRM Capillary rising method FPT Filter paper test MIP Mercury intrusion porosimetry PPT Pressure plate test PSD Pore size distribution SDM Sessile drop method SWCC Soil-water characteristic curve WPM Wilhelmy plate method d Pore diameter mh Slope of the w2 - t curves of n-hexane mw Slope of the w2 - t curves of water n Porosity of the sample Pm Intruding pressure of MIP Tm Surface tension of the mercury phase Surface tension of the water phase Tw Va Real air volume Va,m Air volume measured with MIP Vm Mercury volume Nondetected pore volume (pores
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