Site Measurement and Study of Vertical Freezing Wall Temperatures of a Large-Diameter Shield Tunnel

Table 3

Construction parameters for triple-shaft mixing pile.

Name	Technical parameter	Name	Technical parameter
Rate of sinking (m/min)	0.4∼1.0	Cement grading	P.O 42.5 R
Uplift velocity (m/min)	0.4∼1.0	Cement content	Strongly reinforced region 20%, weekly reinforced region 10%
Grouting pressure (MPa)	1∼2	Grout coordinate ratio	Water: Cement = 1.5 : 1