Modified Maag’s Spherical Diffusion Model of Vacuum Penetration Grouting

Table 3

Theoretical and experimental values of the diffusion radius under different vacuum degrees and soil conditions.

Sand stratum	(kPa)	(mm)	(mm)	(mm)
Medium	60	145	136	−6.2
	40	90	122	35.5
	20	70	110	57.1
Fine	60	110	91	−17.2
	40	80	86	7.5
	20	55	79	43.6
Silty	60	75	48	−36
	40	60	46	−23.3
	20	45	44	−2.2

Where, is vacuum degree; is experimental value; is theoretical value of modification model; is difference of and .