Soil Improvement of EPBS Construction in High Water Pressure and High Permeability Sand Stratum

Table 5

Optimal mixing ratio of sodium bentonite-CMC and mud-polyacrylamide solution.

Sodium bentonite concentration	CMC mass ratio	Polyacrylamide solution concentration	Supersaturated sand: sodium bentonite-CMC mud: polyacrylamide volume ratio
10%	0.5%	3-4%	100 : 2.5 : 0.5