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Table 3 The measured effective strength parameters and the relevant indexes for Q1 loess

From: Investigation for the initiation of a loess landslide based on the unsaturated permeability and strength theory

Specimen

no.

Moisture content

Volumetric moisture content

Matric suction

Total effective cohesion

Effective friction angle

w/(%)

θ w /(%)

u a -u w /(kPa)

c′/(kPa)

φ′/(°)

D1

5

7.9

225.2

105.7

30.0

D2

10

15.8

116.9

67.9

30.1

D3

15

23.7

60.3

42.0

30.5

D4

20

31.6

24.3

19.4

29.4

D5

25

39.5

0.0

7.9

29.6

D6

30

47.4

0.0

5.0

29.5

Strength parameters

φ b = 25.3°

c′ 0 = 5.0 kPa

φ′ = 30.0°