Physical and Mechanical Characteristics of Shallow Expansive Soil due to Freeze-Thaw Effect with Water Supplement

Table 4

Shear strength of expansive soil columns at different depths under different normal stress after the freeze-thaw process.

Depth (cm)	Shear strength (kPa)
	25 kPa			50 kPa			75 kPa			100 kPa
	F1	F2	F3	F1	F2	F3	F1	F2	F3	F1	F2	F3
2	27.9	25.4	27.1	51.7	47.4	49.1	82.5	76.8	80.0	111.2	104.1	108.4
6	27.9	24.6	26.9	51.7	47.0	49.4	82.9	76.4	80.1	110.8	103.7	107.5
10	27.9	24.6	26.7	50.2	46.0	48.3	81.3	75.7	79.2	109.6	102.7	105.8
14	27.4	23.0	25.3	49.9	43.6	45.6	81.7	74.7	77.8	109.4	101.1	103.9
18	25.7	22.4	23.6	47.1	42.4	44.6	79.5	72.9	74.4	106.9	98.6	101.5
22	20.3	22.1	23.2	37.8	40.7	43.2	62.4	66.5	72.5	84.9	89.0	99.3
26	20.4	20.0	22.2	38.0	37.2	42.0	63.3	61.0	71.0	86.5	84.0	95.3
30	20.5	19.8	20.7	38.1	37.6	38.0	63.6	61.5	62.2	86.9	86.4	86.1
34	20.4	20.0	20.6	38.1	37.3	38.4	63.7	61.4	63.0	87.0	85.2	86.2