Analysis of Foundation Pit Support Selection and Design Problems in Deep Soft Soil Area

Table 4

Physical indexes of soil and average cone resistance of static cone penetration test.

Layer no.	Name of soil layer	General thickness (m)	State	Water content (%)	Void ratio	Liquidity index	Cone tip resistance (MPa)
②2	Clayey silt	4	Plastic	31	0.87	—	2.49
④2	Mucky clay	16	Flow plastic	50	1.42	1.34	0.54
⑥1	Argillaceous powder; Silty clay	17	Flow plastic	46	1.33	1.49	0.77
⑥2	Silty clay	9	Soft plastic	35	0.98	0.97	1.20

The main soft soil layer is ④₂ muddy clay and ⑥₁ muddy silty clay. See Table 5 for the recommended soil strength parameters in the survey report.