Mock-up tunnel closure test and the hydro-chemical coupling simulation of environmental condition as a basis of solute transport analysis

Ozaki, Yusuke  ; Iwatsuki, Teruki  ; Onoe, Hironori 

In this study, we evaluate the effect of shotcrete on the geo-environment after closure of drift. The shotcrete is known to be dissolved into water and change the groundwater chemistry. The detail of chemical process of dissolution of shotcrete is analyzed with the in-situ groundwater collected during GREET experiment in MIU. In addition, reactive transportation simulation is performed to predict the movement of high pH groundwater affected by dissolution of shotcrete. Our simulation results show that the movement of high pH water is slow owing to the diffusive condition after closure of drift under our simulation condition.