Effect Analysis of Steel Sheet Pile Supporting for Utility Tunnel Foundation Pit in Water-Rich Soft Soil

Table 1

Geological characteristics of foundation pit.

Layer	Soil description	Composition properties	Mechanical characteristics	Thickness (m)
1-0	Mixed fill soil	Loose or slightly dense state, cohesive soil mixed with rubble and sand	—	0.2–4.5
1	Silty clay	Soft-plastic or plastic state, smooth and shiny soil section, no shaking response	High toughness and dry strength, high compressibility	0.7–2.8
2	Silt	Plastic-flow state, smooth with grease luster soil section, no shaking response		9.4–21.3
3-1	Clay	Plastic state with soft-plastic part, smooth and shiny soil section, no shaking response	High toughness and dry strength, medium compressibility	0.6–14.7
3-2	Clay	Soft-plastic state with the plastic part, smooth with grease luster soil section, no shaking response	High toughness and dry strength, high compressibility	3.1–16.6