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

Table 4

Results of slurry optimization experiment.

Type	No.	Water	Bentonite		CMC		Density	Viscosity
		(g)	(%)	(g)	(%)	(g)	(g/cm^3)	(s)
Initial tests	1	4000	1	40	0	0	1.017	15.26
	2	4000	2	80	0	0	1.022	15.63
	3	4000	3	120	0	0	1.027	16.50
	4	4000	4	160	0	0	1.032	17.61
	5	4000	5	200	0	0	1.037	19.01
	6	4000	6	240	0	0	1.044	22.81
	7	4000	7	280	0	0	1.048	27.96
	8	4000	8	320	0	0	1.053	32.81
	9	4000	9	360	0	0	1.059	49.96
	10	4000	10	400	0	0	1.063	77.23
	11	4000	11	440	0	0	1.071	138.56
	12	4000	12	480	0	0	1.074	238.00
Combination tests	13	4000	5	200	0.15	0.3	1.036	22.73
	14	4000	5	200	0.3	0.6	1.037	23.88
	15	4000	5	200	0.5	1	1.036	25.54
	16	4000	5	200	0.7	1.4	1.037	30.58
	17	4000	8	320	0.15	0.48	1.056	47.46
	18	4000	8	320	0.3	0.96	1.062	59.46
	19	4000	8	320	0.5	1.6	1.054	79.36
	20	4000	8	320	0.7	2.24	1.062	117.43
	21	4000	10	400	0.15	0.6	1.062	88.18
	22	4000	10	400	0.3	1.2	1.071	133.30
	23	4000	10	400	0.5	2	1.072	185.30
	24	4000	10	400	0.7	2.8	1.071	245.60