Mechanics Parameter Optimization and Evaluation of Curtain Grouting Material in Deep, Water-Rich Karst Tunnels

Table 3

The amplitude of the seepage velocity decreases.

Permeability coefficient ratio	1	2	4	6	8	10	12	14	16	18	20
Seepage velocity	14.8	13.7	11.3	9.49	8.26	7.31	6.55	5.94	5.45	5.02	4.65
Decrease amplitude (%)		9.27	24.73	36.29	44.62	50.94	56.05	60.15	63.51	66.40	68.82