Modified Maag’s Spherical Diffusion Model of Vacuum Penetration Grouting

Table 2

Diffusion radii of Maag’s spherical model and vacuum modification model.

(kPa)	Sand soil	(cm)	(mm)	(mm)	(mm)
60	Medium	251.5	136	85.9	50.1
	Fine	134.0	91	64.4	26.6
	Silty	60.6	48	36	12
40	Medium	138.5	122	85.9	36.1
	Fine	82.7	86	64.4	21.6
	Silty	38.5	46	36	10
20	Medium	58.7	110	85.9	24.1
	Finer	37.0	79	64.4	14.6
	Silty	18.3	44	36	8

Where, is vacuum degree; is head change caused by vacuum; is radius of vacuum modification model; is radius of Maag’s spherical model; is absolute difference between and .