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The Proposals relevant to seepage flow simulation in rockmass around tunnel under unsaturated condition; Method for estimating unsaturated seepage parameters of stones and setting of boundary condition on tunnel wall

Imai, Hisashi*; Amemiya, Kiyoshi*; Matsui, Hiroya ; Sato, Toshinori ; Saegusa, Hiromitsu; Watanabe, Kunio*

The more accurate understanding and appropriate control of unsaturated area around tunnel excavated in deep rock-mass are required, for the geological isolation of radioactive waste project and also underground rock cavern storage project of liquefied petroleum gas. The numerical simulation of seepage flow is usually conducted to understand and evaluate the unsaturated zone around tunnel. The unsaturated parameters (such as moisture characteristic curve and relative permeability) and appropriate control of boundary condition are indispensable for the simulation. Authors developed methodology to measure unsaturated parameters utilizing the measuring method conventionally applied to soils and showed the efficiency of the method via a laboratory experiment. The idea of combining seepage face condition and flow rate fixed condition was derived, and the efficiency was shown in an model simulation. The two developments enabled the accurate estimation and understanding the evolution of unsaturated zone around tunnel.

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