Experimental Study on the Formation and Characteristics of Mud Filtration Cake in Large-Diameter Slurry Shield Tunneling

Table 2

Characteristics of the mud slurries.

Mud slurry	Bentonite-to-water ratio	Grain diameter (mm)	CMC content (g/L)	Specific gravity
S1	150 : 1000	<0.15	1.5	1.1
S2	150 : 1000	<0.1	2	1.2
S3	150 : 1000	<0.075	2.5	1.3
S4	125 : 1000	<0.15	2	1.3
S5	125 : 1000	<0.1	2.5	1.1
S6	125 : 1000	<0.075	1.5	1.2
S7	100 : 1000	<0.15	2.5	1.2
S8	100 : 1000	<0.1	1.5	1.3
S9	100 : 1000	<0.075	2	1.1