Experimental Study on the Soil Conditioning Materials for EPB Shield Tunneling in Silty Sand

Table 5

Testing conditions for soil conditioning.

No.	Soil pressure (MPa)	Water content (%)	Soil conditioner	Injection ratio of volume
1	0.1	10	Foam	0–100%
2	0.1	10	Slurry	0–30%
3	0.1	30	Foam	0–100%
4	0.1	30	Slurry	0–30%
5	0.25	10	Foam	0–100%
6	0.25	10	Slurry	0–30%
7	0.25	30	Foam	0–100%
8	0.25	30	Slurry	0–30%