Overviews of groundwater flow analysis code: TAGSAC

Imai, Hisashi; Yanagizawa, Koichi

In order to develop the methodology and equipment for hydrogeological investigation, a study on regional groundwater flow has been carried out by PNC (Power Reactor and Nuclear Fuel Development Corporation) around the Tono area located in the southeast of Gifu prefecture, central Japan. Within this study, three kinds of analytical study concerning the three dimentional groundwater flow are being carried out; (1)Regional groundwater flow analysis in the area of 10 kilometers square with 1000 meter depth. (2)Local groundwater flow analysis around the experimental shaft to examine the effect of shaft excavation in the area of 300 meters square with 300 meter depth. (3)Also effect analysis on the groundwater flow considering the relaxation of rock mass due to the shaft excavation in the restricted small area of 20 meters with 50 meters depth. According to the above study of groundwater flow analysis, the properties of developing analytical code of TAGSAC (Three Dimentional Analysis of Groundwater Flow, Saitama University Code) using FEM method under saturated or unsaturated condition are presented by following fivefold; (1)The utility background of TAGSAC (2)The analysis examples by TAGSAC (3)The governing equation used in TAGSAC and the handling of the equation in unsaturated condition (4)The problems and improving plan for TAGSAC (5)The programme source of TAGSAC