To improve the rationality of seepage field analysis of rock tunnel

a new type of similar materials and the raw material ratio of surrounding rock

grouting circle and initial lining

etc

applied in rock tunnel seepage model test

have been developed through lots of proportioning tests taking the permeability coefficient as the core control variable. The surrounding rock similar material is compounded with clay

fine sand and glass fiber. The similar material of grouting circle is prepared by cement and carbon dross. And the multi-layer woven earthwork cloth is used to simulate the initial lining. The results indicate that the permeability coefficient of surrounding rock similar material presents nonlinear growth and the stability is gradually reduced with the increase of fine sand content. The permeability coefficient is not obviously influenced by the changes of the glass fiber content. The permeability coefficient of grouting circle similar material presents approximate linear growth with the increase of carbon dross content. The test value of 2.5 m hydraulic head is greater than that of 1.35 m. The average permeability coefficient of the initial lining similar material decreases rapidly as well as showing a trend of gradual convergence with the number of layers increased. The single permeability coefficient test result also tends to be stable. The water pressure of arch bottom outside secondary lining is far higher than vault's with the same tunnel discharge. And the vault's water pressure increases more than arch bottom's when water discharge gradually decreases. When approximately truning off the water valve

the arch bottom and vault's water pressure closes to the initial water pressure. The stable performance of similar material provides a guarantee for the application in the tunnel seepage field testing.