Abstract
In order to understand the porewater movement around the drift wall associated with drift excavation, the porewater from drilling core was extracted to measure the electric conductivity and the stable isotopes in Tertiary sedimentary rock mass distributes in Tono mine, Japan.
The result shows as follows;
1) The porewater near the dirt wall was thought to be much influenced by the evaporation associated with drift excavation.
2) The porewater strongly bonded around the rock particle was thought to be less influenced by the evaporation associated with drift excavation.
3) These porewater movement characteristics show distinct differences depend on the lithology around the drift.
4) The difference of the porewater movement characteristics around the drift for the different lithology has also been shown by the groundwater flow characteristics around the drift estimated by the two-dimensional saturated groundwater flow simulation.
The methods applied in this study was confirmed to be very effective to understand the groundwater movement around the drift associated with drift excavation, especially to understand the development of the unsaturated zone around the drift.
