Na-PAA	Sodium polyacrylate
SWCC	Soil–water characteristic curve
AEV	Air−entry value
AEVd	Dimensionless parameter of air−entry value
AMD	Acid mine drainage
CCC	Compacted clay cover
WL	Liquid Limit
WLd	Dimensionless parameter of liquid limit
WP	Plastic limit
IP	Plasticity index
womc	Optimum moisture content
ρdmax	Maximum dry density
womcd	Dimensionless parameter of optimum moisture content
CL	Clay with low liquid limit
MH	Silt with a high liquid limit
G	Replacement content of clinoptilolite
P	Content of Na-PAA
SSR	Sum of residual squares
SSS	Seashore saline soil
HPC	High plasticity clay