Analysis of Foundation Pit Design of Metro Station in Complex Environment

Table 1

A list of stratigraphic distribution in Luboyuan Station.

The cause of the times	Stratum name	Feature	Thickness (m)
Q4^ml	Miscellaneous soil	Miscellaneous colors, mainly grayish-yellow and gray; loose to slightly dense; mainly composed of construction waste, containing a large number of bricks, stones, concrete blocks, and a small amount of silty clay; the surface is partially concrete floor	1.00∼4.10
	Plain filling soil	Grayish-yellow, grayish-brown; loose to slightly dense; mainly composed of clayey soil, see shells and screw fragments, mixed lime, and a small amount of macadam	0.60∼2.20
Q4^al+l	Muddy silty clay	Gray, grayish-brown; flow plastic; soil quality is uneven, with horizontal bedding, sandwiched with silt and a thin layer of silty sand, showing thousands of layers of cake; the middle and lower part of the sand content is gradually higher, with high pressure, occasionally see shell fragments and rotten plants	0.80∼22.40
	Silty sand (medium dense)	Gray, bluish-gray; medium dense; poor gradation; mineral composition is mainly quartz, feldspar, see mica debris, local sandwiched with a thin layer of silty clay	1.80∼15.00
	Silty sand (dense)	Gray, bluish-gray; dense; poor gradation; mineral composition is mainly quartz, feldspar, see mica debris, local sandwiched with a thin layer of silty clay	1.30∼17.40
	Silty clay with silty sand	Grayish brown; soft plastic; soil quality is uneven, with horizontal bedding; the thickness of the single layer is about 5 mm to 20 m, the thickness of the single layer is about 2∼5 mm silt and silty sand, and the thickness ratio is about 4 : 1	0.90∼3.1