Method for Determining Critical Slip Surface of Cohesive Soil Slope Based on the Principle of Simple Penetration Test

Table 1

Soil layer conditions and physical and mechanics parameters of soil body [12].

Depth (m)	Soil classification	Density (g/cm^3)	Elastic modulus (MPa)	Poisson’s ratio	Cohesion (kPa)	Internal friction angle (°)
0–0.8	Silty clay	1.58	21	0.45	49.8	30.7
0.8–1.5	Loam	1.654	28	0.38	95.8	28.7
1.5–2	Sand loam	1.675	28	0.38	95.5	28.3
>2	Silty loam	1.825	36	0.33	136.3	27.5