Phenomenon and Critical Conditions of Chamber Soil Sliming during EPB Shield Tunneling in Water-Rich Weathered Diorite: Case Study of Jinan Metro, China

Table 2

Geological parameters of the interval tunnel.

Soil	ρ (g/cm^3)	(%)	(%)	(%)	Dry	σc saturated (MPa)	k (m/s)
Backfill soil	1.78	22.1	—	—	—	—	—
Silty clay	1.93	23.5	34.4	21.3	—	—	3.25 × 10^−8
Completely weathered diorite	1.96	20.9	27.4	18.8	—	—	3.4 × 10^−5
Sandy strongly weathered diorite	2.15	—	—	—	17.5	11.9	2.3 × 10^−5
Moderately weathered diorite	2.31	—	—	—	58.3	48.6	—

ρ = natural density;  = natural moisture content;  = liquid limit;  = plastic limit; σ_c = uniaxial compressive strength; k = hydraulic conductivity.