Experimental Study on Thermal Insulation Effect of the Buried Oil-Gas Pipelines in Permafrost Regions

Table 3

Key physical parameters of humus soil.

	(%)		(%)	(%)		(cm/s)
2.16	55.6	0.88	52.1	88.0	35.9

Note: : specific gravity; : optimal water content; : maximum dry density; : plastic limit; : liquid limit; : plasticity index; : permeability coefficient.