Study on Deformation Law of Deep Foundation Pit with the Top-Down Method and Its Influence on Adjacent Subway Tunnel

Table 2

Soil layer information.

Soil layer number	Name of soil	Depth, H (m)	Cohesion, c (kPa)	Friction angle, φ (°)	Elastic modulus, E (MPa)	Poisson ratio, µ	Unit weight, γ (kN/m^3)	SPT	Saturated uniaxial compressive strength (MPa)
	Fill	−1.5∼−4.2	18	11	5	0.35	18.6	—	—
	Silt	−2.6∼−4.6	8	10	3	0.3	18.7	3–5	—
	Cobble	−2∼−5.6	—	—	15	0.24	27	—	—
	Silty clay	−5∼−16	28	10	8	0.33	19.3	8–10	—
	Silty clay	−11.4∼−27.8	28	11	8	0.32	19.3	12–14	—
	Silty clay	−15∼−34	30	13	8.5	0.33	19.4	13–14	—
	Silty clay	−3.1∼−20	30	16	10	0.3	19.6	15–17	—
	Silty clay	−8.3∼−27.4	35	18	11.5	0.32	19.5	16–18	—
	Strongly weathered limestone	−16.5∼−61.5	—	—	90	0.2	26	—	—
	Moderately weathered limestone	—	—	—	500	0.2	30	—	93.1