Effects of Nonaqueous Phase Liquids Pollution on the Permeability and Microstructure of In-Filed and Laboratory Soaked Contaminated Clay Soils

Table 8

Permeability test results of contaminated and uncontaminated soil samples.

Soil layer	Permeability coefficient k (10^−7cm/s)
	uncontaminated clay k0 rigid wall	The field contaminated soil rigid wall k1	Indoor soaking contaminated clay k2 (t = 522 d) Improved rigid walls		k1/k0	k2/k0	k2/k1
	t = 0 d	t = 0 d	t = 379 d	t = 522 d	—	—	—
Layer (2)	2.32	3.01	—	—	1.297	—
Layer (3)	5.24	6.37	7.71	8.03	1.215	1.532	1.261
Layer (4)	0.83	1.67	1.34	1.52	2.012	1.831	0.910
Layer (5)	1.73	1.84	—	—	1.064	—	—