During the past years, we have accumulated knowledge and technologies related to groundwater flow through our experience in mine development - mine-water processing - geothermal fluid investigations, and other various operations.

Since 1994, we have been engaged in Three-dimensional-flow analysis with the objective of understanding the water-sealing function of rock-cavern storage tanks jointly with the Kojima Laboratory (presently Tosaka Laboratory) of the Earth System Engineering Department of the University of Tokyo.

This is a simulation attempting to match the results of simulation with observed data such as inflow rate, river flow rate and groundwater level. The simulation model concerns enormous amount of data on geologic and hydrogeologic data and construction records during the past ten-odd years spanning the survey, construction, and operation of the underground storage base. It was carried out on the basis of “Surface - subsurface coupled fluid-flow simulation system” developed by Professor Tosaka.

In construction projects dealing with nature, occurrence of various unexpected events such as local decline of water level are not uncommon. And measures such as grouting are applied in order to cope with such occurrences. During the simulation, trial-and-error method was applied for each of these occurrences and was matched with the observed values.

Models representing natural phenomena in high fidelity were constructed using the above simulator and accessories which we prepared over the past ten-odd years. We are confident that the know-how developed through our experiences will be the most effective tool for the designing and engineering of large-scale underground development which is expected to be undertaken in the coming years.

Water saturation map in the vicinity
of underground tunnels

History-matching of river flow
-
Back