Study on the Floating of Large Diameter Underwater Shield Tunnel Caused by Synchronous Grouting

Table 1

The test results of the optimized grout ratio.

Ratio number	Bleeding rate	Degree of fluidity (cm)	Initial setting time (h)	Compressive strength (7 d)	Compressive strength (28 d)	Water-land strength ratio (7 d)	Water-land strength ratio (28 d)
1	10%	28.1	8.5	0.71	/	Small	/
2	5%	23.5	9.5	0.79	1.38	0.49	0.37
3	10.1%	26.0	8	0.65	3.66	0.86	0.36
4	6.6%	24.5	7	0.67	4.56	0.76	0.40

Notes: means it is less than the instrument range.