Experimental Study on Mechanical Behaviors of Loess Based on Two Different Modes of Oil Contamination

Table 4

Results of direct shear tests under the two different modes of oil contamination.

Modes of oil contamination	Dry densities of soil samples (g/cm^3)	Mechanical characteristics	Oil contents of soil samples (%)
			0	2	4	8	12	16
The first mode	1.35	Cohesion (kPa)	38.53	24.45	19.64	27.31	34.02	15.15
	1.45		59.06	47.60	30.68	34.76	51.46	24.99
	1.55		96.82	74.44	57.14	49.45	69.44	40.14
	1.35	Friction angle (degree)	17.33	14.77	15.07	20.36	17.38	16.99
	1.45		21.06	16.25	17.25	16.78	18.89	17.89
	1.55		24.04	17.57	17.71	20.39	19.67	21.66
The second mode	1.35	Cohesion (kPa)	38.53	34.09	38.53	36.60	23.09	32.35
	1.45		59.06	58.65	53.57	48.21	44.44	42.50
	1.55		96.82	95.13	95.05	86.03	93.04	75.41
	1.35	Friction angle (degree)	17.33	22.11	20.79	23.98	25.18	23.94
	1.45		21.06	27.06	28.31	30.07	26.12	32.69
	1.55		24.04	27.29	28.76	32.66	29.77	33.49