Study on the Mix of Slurry Membrane for Soil Conditioning of EPB Shield and Its Application Effect in Water-Rich Gravel Strata

Table 2

Maximum foaming ratio and bubble half-life with different foaming agent diluent concentrations.

Serial number	Concentration (%)	Maximum foaming rate (times)	Bubble half-life (min)
1	1	28	7.5
2	2	45	11.5
3	3	58	13.5
4	4	56	14
5	5	57	14.5
6	6	57	14.5