Theoretical Research on Grouting in Deep Loose Layers Based on the Cylindrical Diffusion Model of Radial Tube Flow

Table 2

Grouting test results of the 3rd wind inspection hole.

Grouting section no.	(m)	(h)	(MPa)	(m^3)	(m)	Diffusion radius calculation error (%)
ZJ5	175.05~196.11	31.30	4.24~4.80	290	6.83	-14.63
ZJ4	247.34~282.00	26.40	4.89~6.69	220	6.34	-20.75
ZJ3	332.27~364.27	23.50	7.18~9.99	206	6.57	-17.88
ZJ2	430.33~462.43	22.40	8.73~13.40	140	—	—
ZJ1	540.46~574.90	20.50	11.82~13.92	166	—	—

Note: is the depth of the grouting section, is the grouting time, is the injection point pressure, is the grouting amount, and is the theoretically calculated value of the diffusion radius. Owing to the first grouting in the ZJ1 grouting section, the grouting was stopped when only 166 m³ of slurry was injected, and the grouting in the ZJ2 grouting section was stopped when only 140 m³ of slurry was injected, owing to the slurry leakage from the stop-grouting plug.