地球化学的手法による岩盤内の広域地下水流動挙動評価 : トンネルサイトへの適用例 : (<特集>地盤計測結果の応用地質学的評価)

概要

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Recently, the variety of utilization of underground rock cavern requires the increase of problem of underground water in a rock mass. Especially, at the construction of the repository of high level radioactive waste, it is nessesary to exactly evaluate deep and regional groundwater flow in order to keep safety of the rock mass as natural barrier if harmful nuclides are leaked because of some accident. For these needs, one of the suitable methods is geochemical method, which gives information about real groundwater flow─recharge area, residence time, source and so on─by means of dissolved ions and environmental isotopes. In this report, the result was shown to apply this geochemical method to groundwater flow To evaluate regional groundwater flow in detail, this investigation was focused on these points, (1) principal component analysis for major dissolved ions, (2) altitude effect of stable isotope ^<18>O in water, (3) dissolved ^<222>Rn gas, (4) stable isotope <13>C in dissolved carbonate. From these results, it was concluded that regional groundwater flow in this site can be modeled as a flow in porous medium, and that changes of groundwater flow because of tunnelling can be evaluated by geochemical method.
一般社団法人日本応用地質学会の論文
1996-02-10